1. Comprehensive Appearance Quality Inspection
Comprehensive appearance quality inspection is a core step in the delivery and acceptance of granite components. Multi-dimensional indicators must be verified to ensure that the product meets design requirements and application scenarios. The following inspection specifications are summarized in four key dimensions: integrity, surface quality, size and shape, and labeling and packaging:
Integrity Inspection
Granite components must be thoroughly screened for physical damage. Defects that affect structural strength and performance, such as surface cracks, broken edges and corners, embedded impurities, fractures, or defects, are strictly prohibited. According to the latest requirements of GB/T 18601-2024 “Natural Granite Building Boards,” the allowable number of defects such as cracks has been significantly reduced compared to the previous version of the standard, and the provisions regarding color spots and color line defects in the 2009 version have been deleted, further strengthening structural integrity control. For special-shaped components, additional structural integrity inspections are required after processing to avoid hidden damage caused by complex shapes. Key Standards: GB/T 20428-2006 “Rock Leveler” clearly stipulates that the working surface and sides of the leveler must be free of defects such as cracks, dents, loose texture, wear marks, burns, and abrasions that would seriously affect appearance and performance.
Surface Quality
Surface quality testing must consider smoothness, gloss, and color harmony:
Surface Roughness: For precision engineering applications, the surface roughness must meet Ra ≤ 0.63μm. For general applications, this can be achieved according to the contract. Some high-end processing companies, such as Sishui County Huayi Stone Craft Factory, can achieve a surface finish of Ra ≤ 0.8μm using imported grinding and polishing equipment.
Gloss: Mirrored surfaces (JM) must meet a specular gloss of ≥ 80GU (ASTM C584 standard), measured using a professional gloss meter under standard light sources. Color difference control: This must be performed in an environment without direct sunlight. The “standard plate layout method” can be used: boards from the same batch are laid flat in the layout workshop, and color and grain transitions are adjusted to ensure overall consistency. For special-shaped products, color difference control requires four steps: two rounds of rough material selection at the mine and factory, water-based layout and color adjustment after cutting and segmenting, and a second layout and fine-tuning after grinding and polishing. Some companies can achieve a color difference accuracy of ΔE ≤ 1.5.
Dimensional and Form Accuracy
A combination of “precision tools + standard specifications” is used to ensure that dimensional and geometric tolerances meet design requirements:
Measuring Tools: Use instruments such as vernier calipers (accuracy ≥ 0.02mm), micrometers (accuracy ≥ 0.001mm), and laser interferometers. Laser interferometers must comply with measurement standards such as JJG 739-2005 and JB/T 5610-2006. Flatness Inspection: In accordance with GB/T 11337-2004 “Flatness Error Detection,” flatness error is measured using a laser interferometer. For precision applications, the tolerance must be ≤0.02mm/m (in compliance with the Class 00 accuracy specified in GB/T 20428-2006). Ordinary sheet materials are categorized by grade, for example, the flatness tolerance for rough-finished sheet materials is ≤0.80mm for Grade A, ≤1.00mm for Grade B, and ≤1.50mm for Grade C.
Thickness Tolerance: For rough-finished sheet materials, the tolerance for thickness (H) is controlled to be: ±0.5mm for Grade A, ±1.0mm for Grade B, and ±1.5mm for Grade C, for H ≤12mm. Fully automatic CNC cutting equipment can maintain a dimensional accuracy tolerance of ≤0.5mm.
Marking and Packaging
Marking Requirements: Component surfaces must be clearly and durably labeled with information such as model, specification, batch number, and production date. Special-shaped components must also include a processing number to facilitate traceability and installation matching. Packaging Specifications: Packaging must comply with GB/T 191 “Packaging, Storage, and Transportation Pictorial Marking.” Moisture- and shock-resistant symbols must be affixed, and three levels of protective measures must be implemented: ① Apply anti-rust oil to contact surfaces; ② Wrap with EPE foam; ③ Secure with a wooden pallet, and install anti-slip pads on the bottom of the pallet to prevent movement during transportation. For assembled components, they must be packaged according to the assembly diagram numbering sequence to avoid confusion during on-site assembly.
Practical Methods for Color Difference Control: Block materials are selected using the “six-sided water spraying method.” A dedicated water sprayer evenly sprays water onto the block surface. After drying with a constant pressure press, the block is inspected for grain, color variations, impurities, and other defects while still slightly dry. This method more accurately identifies hidden color variations than traditional visual inspection.
2. Scientific Testing of Physical Properties
Scientific testing of physical properties is a core component of granite component quality control. Through systematic testing of key indicators such as hardness, density, thermal stability, and resistance to degradation, we can comprehensively assess the material’s inherent properties and long-term service reliability. The following describes the scientific testing methods and technical requirements from four perspectives.
Hardness Testing
Hardness is a core indicator of granite’s resistance to mechanical wear and scratching, directly determining the component’s service life. Mohs hardness reflects the material’s surface resistance to scratching, while Shore hardness characterizes its hardness characteristics under dynamic loads. Together, they form the basis for evaluating wear resistance.
Testing Instruments: Mohs Hardness Tester (Scratch Method), Shore Hardness Tester (Rebound Method)
Implementation Standard: GB/T 20428-2006 “Test Methods for Natural Stone – Shore Hardness Test”
Acceptance Threshold: Mohs Hardness ≥ 6, Shore Hardness ≥ HS70
Correlation Explanation: Hardness value is positively correlated with wear resistance. A Mohs hardness of 6 or higher ensures that the component surface is resistant to scratching from daily friction, while a Shore hardness that meets the standard ensures structural integrity under impact loads. Density and Water Absorption Test
Density and water absorption are key parameters for evaluating granite’s compactness and resistance to penetration. High-density materials typically have lower porosity. Low water absorption effectively blocks the intrusion of moisture and corrosive media, significantly improving durability.
Testing Instruments: Electronic balance, vacuum drying oven, density meter
Implementation Standard: GB/T 9966.3 “Natural Stone Test Methods – Part 3: Water Absorption, Bulk Density, True Density, and True Porosity Tests”
Qualifying Threshold: Bulk density ≥ 2.55 g/cm³, water absorption ≤ 0.6%
Durability Impact: When density ≥ 2.55 g/cm³ and water absorption ≤ 0.6%, the stone’s resistance to freeze-thaw and salt precipitation is significantly enhanced, reducing the risk of related defects such as concrete carbonization and steel corrosion.
Thermal Stability Test
The thermal stability test simulates extreme temperature fluctuations to evaluate the dimensional stability and crack resistance of granite components under thermal stress. The thermal expansion coefficient is a key evaluation metric. Testing Instruments: High and Low Temperature Cycling Chamber, Laser Interferometer
Test Method: 10 cycles of temperature from -40°C to 80°C, each cycle held for 2 hours
Reference Indicator: Thermal Expansion Coefficient controlled within 5.5×10⁻⁶/K ± 0.5
Technical Significance: This coefficient prevents microcrack growth due to thermal stress accumulation in components exposed to seasonal temperature swings or diurnal temperature fluctuations, making it particularly suitable for outdoor exposure or high-temperature operating environments.
Frost Resistance and Salt Crystallization Test: This frost resistance and salt crystallization test evaluates the stone’s resistance to degradation from freeze-thaw cycles and salt crystallization, specifically designed for use in cold and saline-alkali regions. Frost Resistance Test (EN 1469):
Sample Condition: Stone specimens saturated with water
Cycling Process: Freeze at -15°C for 4 hours, then thaw in 20°C water for 48 cycles, totaling 48 cycles
Qualification Criteria: Mass loss ≤ 0.5%, flexural strength reduction ≤ 20%
Salt Crystallization Test (EN 12370):
Applicable Scenario: Porous stone with a water absorption rate greater than 3%
Test Process: 15 cycles of immersion in a 10% Na₂SO₄ solution followed by drying
Evaluation Criteria: No surface peeling or cracking, no microscopic structural damage
Test Combination Strategy: For cold coastal areas with salt fog, both freeze-thaw cycles and salt crystallization testing are required. For dry inland areas, only the frost resistance test may be performed, but stone with a water absorption rate greater than 3% must also undergo salt crystallization testing.
3、Compliance and Standard Certification
The compliance and standard certification of granite components is a key step in ensuring product quality, safety, and market access. They must simultaneously meet domestic mandatory requirements, international market regulations, and industry quality management system standards. The following explains these requirements from three perspectives: the domestic standard system, international standard alignment, and the safety certification system.
Domestic Standard System
The production and acceptance of granite components in China must strictly adhere to two core standards: GB/T 18601-2024 “Natural Granite Building Boards” and GB 6566 “Limits of Radionuclides in Building Materials.” GB/T 18601-2024, the latest national standard replacing GB/T 18601-2009, applies to the production, distribution, and acceptance of panels used in architectural decoration projects using the adhesive bonding method. Key updates include:
Optimized functional classification: Product types are clearly categorized by application scenario, the classification of curved panels has been removed, and compatibility with construction techniques has been improved;
Upgraded performance requirements: Indicators such as frost resistance, impact resistance, and anti-slip coefficient (≥0.5) have been added, and rock and mineral analysis methods have been removed, focusing more on practical engineering performance;
Refined testing specifications: Developers, construction companies, and testing agencies are provided with unified testing methods and assessment criteria.
Regarding radioactive safety, GB 6566 mandates that granite components have an internal radiation index (IRa) ≤ 1.0 and an external radiation index (Iγ) ≤ 1.3, ensuring that building materials pose no radioactive hazards to human health. Compatibility with International Standards
Exported granite components must meet the regional standards of the target market. ASTM C1528/C1528M-20e1 and EN 1469 are the core standards for the North American and EU markets, respectively.
ASTM C1528/C1528M-20e1 (American Society for Testing and Materials standard): Serving as an industry consensus guide for dimension stone selection, it references several related standards, including ASTM C119 (Standard Specification for Dimension Stone) and ASTM C170 (Compressive Strength Testing). This provides architects and contractors with a comprehensive technical framework from design selection to installation and acceptance, emphasizing that stone application must comply with local building codes.
EN 1469 (EU standard): For stone products exported to the EU, this standard serves as the mandatory basis for CE certification, requiring products to be permanently marked with the standard number, performance grade (e.g., A1 for exterior floors), country of origin, and manufacturer information. The latest revision further strengthens physical property testing, including flexural strength ≥8MPa, compressive strength ≥50MPa, and frost resistance. It also requires manufacturers to establish a factory production control (FPC) system covering raw material inspection, production process monitoring, and finished product inspection.
Safety Certification System
Safety certification for granite components is differentiated based on the application scenario, primarily encompassing food contact safety certification and quality management system certification.
Food contact applications: FDA certification is required, focusing on testing the chemical migration of stone during food contact to ensure that the release of heavy metals and hazardous substances meets food safety thresholds.
General Quality Management: ISO 9001 quality management system certification is a fundamental industry requirement. Companies such as Jiaxiang Xulei Stone and Jinchao Stone have achieved this certification, establishing a comprehensive quality control mechanism from rough material quarrying to finished product acceptance. Typical examples include the 28 quality inspection steps implemented in the Country Garden project, covering key indicators such as dimensional accuracy, surface flatness, and radioactivity. Certification documents must include third-party test reports (such as radioactivity testing and physical property testing) and factory production control records (such as FPC system operation logs and raw material traceability documentation), establishing a complete quality traceability chain.
Key Compliance Points
Domestic sales must simultaneously meet the performance requirements of GB/T 18601-2024 and the radioactivity limits of GB 6566;
Products exported to the EU must be EN 1469 certified and bear the CE mark and A1 performance rating;
ISO 9001-certified companies must retain at least three years of production control records and test reports for regulatory review.
Through the integrated application of a multi-dimensional standard system, granite components can achieve quality control throughout their entire lifecycle, from production to delivery, while meeting the compliance requirements of both domestic and international markets.
4. Standardized Acceptance Document Management
Standardized acceptance document management is a core control measure for the delivery and acceptance of granite components. Through a systematic documentation system, a quality traceability chain is established to ensure traceability and compliance throughout the component lifecycle. This management system primarily encompasses three core modules: quality certification documents, shipping and packing lists, and acceptance reports. Each module must strictly adhere to national standards and industry specifications to form a closed-loop management system.
Quality Certification Documents: Compliance and Authoritative Verification
Quality certification documents are the primary evidence of component quality compliance and must be complete, accurate, and compliant with legal standards. The core document list includes:
Material Certification: This covers basic information such as the origin of the rough material, mining date, and mineral composition. It must correspond to the physical item number to ensure traceability. Before the rough material leaves the mine, a mine inspection must be completed, documenting the mining sequence and initial quality status to provide a benchmark for subsequent processing quality. Third-party test reports must include physical properties (such as density and water absorption), mechanical properties (compressive strength and flexural strength), and radioactivity testing. The testing organization must be CMA-qualified (e.g., a reputable organization like the Beijing Inspection and Quarantine Institute). The test standard number must be clearly indicated in the report, for example, the compressive strength test results in GB/T 9966.1, “Test Methods for Natural Stone – Part 1: Compressive Strength Tests after Drying, Water Saturation, and Freeze-Thaw Cycles.” Radioactivity testing must comply with the requirements of GB 6566, “Limits of Radionuclides in Building Materials.”
Special Certification Documents: Export products must additionally provide CE marking documentation, including a test report and manufacturer’s Declaration of Performance (DoP) issued by a notified body. Products involving System 3 must also submit a Factory Production Control (FPC) certificate to ensure compliance with the technical requirements for natural stone products in EU standards such as EN 1469.
Key Requirements: All documents must be stamped with the official seal and interline seal of the testing organization. Copies must be marked “identical to the original” and signed and confirmed by the supplier. The document’s validity period must extend beyond the date of shipment to avoid using expired test data. Shipping Lists and Packing Lists: Precise Control of Logistics
Shipping lists and packing lists are key vehicles connecting order requirements with physical delivery, requiring a three-level verification mechanism to ensure delivery accuracy. The specific process includes:
Unique Identification System: Each component must be permanently labeled with a unique identifier, either a QR code or a barcode (laser etching is recommended to prevent wear). This identifier includes information such as component model, order number, processing batch, and quality inspector. At the rough material stage, components must be numbered according to the order in which they were mined and marked with wash-resistant paint on both ends. Transportation and loading and unloading procedures must be performed in the order in which they were mined to prevent material mix-up.
Three-Level Verification Process: The first level of verification (order vs. list) confirms that the material code, specifications, and quantity in the list are consistent with the purchase contract; the second level of verification (list vs. packaging) verifies that the packaging box label matches the unique identifier in the list; and the third level of verification (packaging vs. actual product) requires unpacking and spot checks, comparing the actual product parameters with the list data by scanning the QR code/barcode. Packaging specifications must comply with the marking, packaging, transportation, and storage requirements of GB/T 18601-2024, “Natural Granite Building Boards.” Ensure that the packaging material’s strength is appropriate for the component’s weight and prevent damage to corners during transportation.
Acceptance Report: Confirmation of Results and Delineation of Responsibilities
The acceptance report is the final document of the acceptance process. It must comprehensively document the testing process and results, meeting the traceability requirements of the ISO 9001 quality management system. Core report contents include:
Test Data Record: Detailed physical and mechanical property test values (e.g., flatness error ≤ 0.02 mm/m, hardness ≥ 80 HSD), geometric dimensional deviations (length/width/thickness tolerance ±0.5 mm), and attached charts of original measurement data from precision instruments such as laser interferometers and gloss meters (recommended to retain three decimal places). The testing environment must be strictly controlled, with a temperature of 20 ± 2°C and a humidity of 40%-60% to prevent environmental factors from interfering with measurement accuracy. Non-conformity Handling: For items exceeding standard requirements (e.g., surface scratch depth >0.2mm), the defect location and extent must be clearly described, along with the appropriate action plan (rework, downgrade, or scrapping). The supplier must submit a written corrective commitment within 48 hours.
Signature and Archiving: The report must be signed and stamped by the acceptance representatives of both the supplier and buyer, clearly indicating the acceptance date and conclusion (qualified/pending/rejected). Also included in the archive should be calibration certificates for testing tools (e.g., the measuring tool accuracy report under the JJG 117-2013 “Granite Slab Calibration Specification”) and records of the “three inspections” (self-inspection, mutual inspection, and specialized inspection) during the construction process, forming a complete quality record.
Traceability: The report number must use the format of “project code + year + serial number” and be linked to the component’s unique identifier. Bidirectional traceability between electronic and physical documents is achieved through the ERP system, and the report must be retained for at least five years (or longer as agreed in the contract). Through the standardized management of the above-mentioned document system, the quality of the entire process of granite components from raw materials to delivery can be controlled, providing reliable data support for subsequent installation, construction and after-sales maintenance.
5. Transportation Plan and Risk Control
Granite components are highly brittle and require stringent precision, so their transportation requires a systematic design and risk control system. Integrating industry practices and standards, the transportation plan must be coordinated across three aspects: transportation mode adaptation, application of protective technologies, and risk transfer mechanisms, ensuring consistent quality control from factory delivery to acceptance.
Scenario-Based Selection and Pre-Verification of Transportation Methods
Transportation arrangements should be optimized based on the distance, component characteristics, and project requirements. For short-distance transport (typically ≤300 km), road transport is preferred, as its flexibility allows for door-to-door delivery and reduces transit losses. For long-distance transport (>300 km), rail transport is preferred, leveraging its stability to mitigate the impact of long-distance turbulence. For export, large-scale shipping is essential, ensuring compliance with international freight regulations. Regardless of the method used, pre-packaging testing must be performed prior to transportation to verify the effectiveness of the packaging solution, simulating a 30 km/h impact to ensure structural damage to the components. Route planning should utilize a GIS system to avoid three high-risk areas: continuous curves with slopes greater than 8°, geologically unstable zones with historical earthquake intensity ≥6, and areas with a record of extreme weather events (such as typhoons and heavy snow) in the past three years. This reduces external environmental risks at the source of the route.
It is important to note that while GB/T 18601-2024 provides general requirements for the “transportation and storage” of granite slabs, it does not specify detailed transportation plans. Therefore, in actual operation, supplementary technical specifications should be added based on the component’s accuracy level. For example, for Class 000 high-precision granite platforms, temperature and humidity fluctuations must be monitored throughout transportation (with a control range of 20±2°C and humidity of 50%±5%) to prevent environmental changes from releasing internal stress and causing accuracy deviations.
Three-Layer Protection System and Operating Specifications
Based on the physical properties of granite components, protective measures should incorporate a three-layered “buffering-fixing-isolation” approach, strictly adhering to the ASTM C1528 seismic protection standard. The inner protective layer is fully wrapped with 20 mm thick pearl foam, with a focus on rounding the corners of the components to prevent sharp points from piercing the outer packaging. The middle protective layer is filled with EPS foam boards with a density of ≥30 kg/m³, which absorb transportation vibration energy through deformation. The gap between the foam and the component surface must be controlled to ≤5 mm to prevent displacement and friction during transportation. The outer protective layer is secured with a solid wooden frame (preferably pine or fir) with a cross-section of no less than 50 mm × 80 mm. Metal brackets and bolts ensure rigid fixation to prevent relative movement of the components within the frame.
In terms of operation, the principle of “handling with care” must be strictly adhered to. Loading and unloading tools must be equipped with rubber cushions, the number of components lifted at a time must not exceed two, and the stacking height must be ≤1.5 m to avoid heavy pressure that may cause microcracks in the components. Qualified components undergo surface protection treatment before shipment: spraying with a silane protective agent (penetration depth ≥2 mm) and covering with PE protective film to prevent oil, dust, and rainwater erosion during transportation. Protecting Key Control Points
Corner Protection: All right-angled areas must be fitted with 5mm thick rubber corner protectors and secured with nylon cable ties.
Frame Strength: Wooden frames must pass a static pressure test of 1.2 times the rated load to ensure deformation.
Temperature and Humidity Labeling: A temperature and humidity indicator card (range -20°C to 60°C, 0% to 100% RH) should be affixed to the outside of the packaging to monitor environmental changes in real time.
Risk Transfer and Full-Process Monitoring Mechanism
To address unforeseen risks, a dual risk prevention and control system combining “insurance + monitoring” is necessary. Comprehensive freight insurance should be selected with a coverage amount of no less than 110% of the actual value of the cargo. Core coverage includes: physical damage caused by collision or overturning of the transport vehicle; water damage caused by heavy rain or flooding; accidents such as fire and explosion during transportation; and accidental drops during loading and unloading. For high-value precision components (valued at over 500,000 yuan per set), we recommend adding SGS transport monitoring services. This service utilizes real-time GPS positioning (accuracy ≤ 10 m) and temperature and humidity sensors (data sampling interval 15 minutes) to create an electronic ledger. Abnormal conditions automatically trigger alerts, enabling visual traceability throughout the entire transportation process.
A tiered inspection and accountability system should be established at the management level: Before transportation, the quality inspection department will verify the integrity of the packaging and sign a “Transportation Release Note.” During transportation, escort personnel will conduct a visual inspection every two hours and record the inspection. Upon arrival, the recipient must immediately unpack and inspect the goods. Any damage such as cracks or chipped corners must be rejected, eliminating the “use first, repair later” mentality. Through a three-dimensional prevention and control system combining “technical protection + insurance transfer + management accountability,” the transport cargo damage rate can be kept below 0.3%, significantly lower than the industry average of 1.2%. It’s particularly important to emphasize that the core principle of “strictly preventing collisions” must be adhered to throughout the entire transportation and loading and unloading process. Both rough blocks and finished components must be stacked in an orderly manner according to category and specification, with a stack height of no more than three layers. Wooden partitions should be used between layers to prevent contamination from friction. This requirement complements the principled provisions for “transportation and storage” in GB/T 18601-2024, and together they form the foundation for quality assurance in the logistics of granite components.
6. Summary of the Importance of the Acceptance Process
The delivery and acceptance of granite components is a critical step in ensuring project quality. As the first line of defense in construction project quality control, its multi-dimensional testing and full-process control directly impact project safety, economic efficiency, and market access. Therefore, a systematic quality assurance system must be established from the three dimensions of technology, compliance, and economics.
Technical Level: Dual Assurance of Precision and Appearance
The core of the technical level lies in ensuring that components meet design precision requirements through the coordinated control of appearance consistency and performance index testing. Appearance control must be implemented throughout the entire process, from rough material to finished product. For example, a color difference control mechanism of “two selections for rough material, one selection for plate material, and four selections for plate layout and numbering” is implemented, coupled with a light-free layout workshop to achieve a natural transition between color and pattern, thus avoiding construction delays caused by color difference. (For example, one project was delayed for nearly two weeks due to inadequate color difference control.) Performance testing focuses on physical indicators and machining accuracy. For example, BRETON automatic continuous grinding and polishing machines are used to control flatness deviation to <0.2mm, while infrared electronic bridge cutting machines ensure length and width deviations to <0.5mm. Precision engineering even requires a strict flatness tolerance of ≤0.02mm/m, requiring detailed verification using specialized tools such as gloss meters and vernier calipers.
Compliance: Market Access Thresholds for Standard Certification
Compliance is essential for product entry into domestic and international markets, requiring simultaneous compliance with both domestic mandatory standards and international certification systems. Domestically, compliance with GB/T 18601-2024 requirements for compressive strength and flexural strength is essential. For example, for high-rise buildings or in cold regions, additional testing for frost resistance and cement bond strength is required. In the international market, CE certification is a key requirement for exporting to the EU and requires passing the EN 1469 test. The ISO 9001 international quality system, through its “three-inspection system” (self-inspection, mutual inspection, and specialized inspection) and process control, ensures full quality accountability from raw material procurement to finished product shipment. For example, Jiaxiang Xulei Stone has achieved an industry-leading 99.8% product qualification rate and 98.6% customer satisfaction rate through this system.
Economic Aspect: Balancing Cost Control with Long-Term Benefits
The economic value of the acceptance process lies in its dual benefits of short-term risk mitigation and long-term cost optimization. Data shows that rework costs due to unsatisfactory acceptance can account for 15% of the total project cost, while subsequent repair costs due to issues like invisible cracks and color shifts can be even higher. Conversely, strict acceptance can reduce subsequent maintenance costs by 30% and avoid project delays caused by material defects. (For example, in one project, cracks caused by negligent acceptance resulted in repair costs exceeding the original budget by 2 million yuan.) A stone material company achieved a 100% project acceptance rate through a “six-level quality inspection process,” resulting in a 92.3% customer repurchase rate, demonstrating the direct impact of quality control on market competitiveness.
Core Principle: The acceptance process must implement the ISO 9001 “continuous improvement” philosophy. A closed-loop “acceptance-feedback-improvement” mechanism is recommended. Key data such as color difference control and flatness deviation should be reviewed quarterly to optimize selection standards and inspection tools. Root cause analysis should be conducted on rework cases, and the “Non-Conforming Product Control Specification” should be updated. For example, through quarterly data review, one company reduced the grinding and polishing process’s acceptance rate from 3.2% to 0.8%, saving over 5 million yuan in annual maintenance costs.
Through the three-dimensional synergy of technology, compliance, and economics, the delivery acceptance of granite components is not only a quality control checkpoint but also a strategic step in promoting industry standardization and enhancing corporate competitiveness. Only by integrating the acceptance process into the entire industry chain’s quality management system can the integration of project quality, market access, and economic benefits be achieved.
Post time: Sep-15-2025