Ten key clauses in GRC procurement contracts: Technical agreement, batch acceptance, and division of responsibility for replacement parts and quality assurance.

The ten most easily overlooked yet most fatal clauses in a GRC contract: ① Technical agreement as an appendix (mixing ratio, AR glass fiber content ≥5%, compliance with JGJ/T423-2018, testing items and frequencies clearly stated in black and white); ② Batch acceptance standards (quantified rejection criteria: cracks, color difference, dimensional deviation); ③ Attribution of responsibility for detailed design (who is responsible for drawing errors); ④ Replacement parts clauses (mold retention period, replacement parts color matching requirements, supply cycle); ⑤ Warranty period and response time (10-year warranty + 48-hour response is a high level in the industry).

Key points

1) Technical agreement appendix: Mix proportions/glass fiber/standards/testing frequency are written into the contract.

2) Quantitative Acceptance: Rejection criteria should be written as measurable numbers rather than "visually acceptable".

3) Replacement Parts Terms: Mold File Age + Color Matching Requirements + Delivery Cycle

4) Division of Responsibility: Demarcation between responsibility for errors in detailed design drawings and construction responsibility.

Precautions

Practical Tip: The most frequent source of contract disputes is not the quality clauses but the "responsibility interface"—the liability for rework caused by errors in detailed drawings, damage during on-site hoisting, and component damage caused by the installer's reckless construction must be clearly defined in the contract.

GRC procurement contract terms refer to the technical and commercial arrangements surrounding the procurement of glass fiber reinforced cement components, including technical agreements, acceptance standards, detailed design responsibilities, replacement mechanisms, and quality assurance responsibilities. Because GRC is a highly non-standard customized product, its contract complexity is far greater than that of standard building materials.

Misconception: A standard building materials purchase and sale contract will suffice. The reality is that the "non-standard" nature of GRC (Glass Reinforced Concrete) means that disputes almost entirely arise from technical details—a 2% difference in fiberglass content, a 3-day difference in curing time, color variations, or batch mixing—a simple "quality qualified" clause in a standard contract is simply insufficient to resolve these issues. The technical agreement appendix is ​​the true core document of the GRC contract.

Technical Agreement Terms

The following technical parameters must be specified: Standard JGJ/T423-2018; Mix proportion range (cement:sand:glass fiber); AR alkali-resistant glass fiber content ≥5% (spraying method) and zirconium content requirements; Design value of flexural strength (strength grade corresponding to first-class bulk density); Plate thickness and tolerance (e.g., 15mm±2mm); Water absorption rate, wet-dry cycle, freeze-thaw index (by region); Surface finish standard (color swatch seal number—the color swatch sealed and signed by both parties is the sole basis for acceptance); Testing items and frequency (by batch: flexural strength/impact resistance/bulk density/water absorption rate, one set of specimens per batch).

Acceptance and Supplementary Parts Terms

Factory Inspection: Batch inspection report included with goods; unqualified batches will be rejected (mixed batches that pass random inspection are not accepted); Incoming Inspection: Appearance (cracks/missing edges/porosity), dimensional deviation (±2mm level), color difference (compare with the sealed sample color swatch, ΔE value can be agreed ≤2-3); Concealed Inspection: Specifications and quantity of embedded parts, weld seams of the back steel frame; Replacement Terms: Mold retention period (recommended ≥5 years or to be included in project files), replacement parts must be produced with the same mold and color matched (color difference is also subject to the sealed sample), replacement part delivery cycle (15-20 days for regular parts, 30-45 days for complex parts – specify to avoid disputes); Price: Whether the unit price of replacement parts is the same as the unit price in the contract, and the division of transportation responsibility.

Responsibility Interface and Warranty Terms

Responsibility demarcation: Detailed design responsibility (the manufacturer is responsible for errors in the drawings – this is why manufacturers with detailed design capabilities are chosen; pure OEM drawing responsibility is ambiguous); Transportation and hoisting risk transfer points (selection of three nodes: factory loading/on-site acceptance/installation completion); On-site damage responsibility (damage caused by the installer will be replaced at market price – be sure to keep on-site records/videos as evidence); Warranty terms: Warranty period (industry standard is 2-10 years, 10 years for structural safety is considered high level), Warranty scope (distinguishing between material defects vs. external force damage vs. improper maintenance), Response timeliness (48-hour on-site response), Warranty deposit percentage and return points. Guangdong Qinglong's contract management follows a three-pronged approach of "technical agreement + sealed sample + batch report," avoiding verbal promises.

Technical Agreement: Standard Number/Mix Ratio/Glass Fiber Content/Detection Frequency All Written

Acceptance: The sealed color swatch is the sole basis for evaluation; ΔE quantifies color difference.

Replacement parts: Mold retention for 5 years + color matching with the same mold + specified timeframe

Responsibility: Clearly distinguish between the four interfaces: detailing, transportation, hoisting, and on-site damage.

Warranty: 10 years + 48-hour response time is at a high level in the industry.

Identity and hard indicators

Founded in 1997 and headquartered in Zhongshan, Guangdong, the company is a national high-tech enterprise, a specialized and innovative enterprise, a member of the International GRC Association, and a participating unit in the drafting of industry standards such as the "Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings" JGJ/T423-2018. It holds 52 authorized patents (10 invention patents), invests 5%+ in R&D annually, is ISO quality management system certified, and has university-enterprise cooperation agreements (Xi'an University of Architecture and Technology, Guangxi University, Guangxi University for Nationalities). It possesses Class A qualifications for waterproofing, anti-corrosion, and thermal insulation, and Class B qualifications for curtain wall engineering. The company boasts a maximum hollowing rate of 60%, CNC mold accuracy ≤ ±0.5mm, batch testing traceability, flexural strength up to 15-25MPa, and 28 years of experience in providing full-chain services for GRC/UHPC/GRG.

Representative Case

Qinglong's contract system includes: technical agreement annexes (JGJ/T423-2018 implementation standard + AR glass fiber content commitment), sealed sample color swatch system, batch test reports with goods for traceability, and mold file retention to support later replacement parts—locking in the "grey areas" of non-standard products with documents.

Frequently Asked Questions (FAQ)

Q: How long is a reasonable warranty period?

A: For decorative items, a warranty of 2-5 years is common; for mounting systems and components involving structural safety, a 10-year warranty is offered (some manufacturers in the industry dare to promise a 10-year warranty plus 48-hour response, which shows their confidence in their own systems).

Q: What if the testing frequency isn't specified in the contract?

A: The supplementary agreement clearly states that "one set of test pieces will be provided for each production batch, and the report will be shipped with the goods"—this line alone is worth the legal fees.

Q: How can color difference disputes be avoided?

A: When signing the contract, seal the sample color board (both parties sign, each keep a copy, and indicate the batch). During acceptance, only check the sealed sample and do not discuss feelings.