What Performance Tests Are Required Before Products Leave the Factory?

In the field of architectural decoration, material performance directly affects a building's safety, durability, and aesthetics. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group understands that pre-shipment performance testing is a key step in ensuring engineering quality. This article provides an in-depth analysis of the core pre-shipment testing items for the four major new architectural decoration materials—UHPC, GRC, GRG, and GRP—offering professional reference for designers, owners, and industry peers.

### I. UHPC (Ultra-High Performance Concrete): The Dual Test of Mechanical Performance and Durability

UHPC has become the preferred material for high-end buildings thanks to its ultra-high strength and excellent durability, and it must pass rigorous mechanical performance testing before shipment. The first is the compressive strength test, which requires a standard of 150MPa or above; through its independently developed mix ratio technology, Qinglong Group's actual test values generally exceed 180MPa. The second is flexural strength, which must meet the industry standard of 25MPa to ensure components do not easily fracture under load. In addition, durability indicators such as UHPC's elastic modulus and chloride ion permeability coefficient must be strictly controlled, with stability in extreme environments verified through freeze-thaw cycle tests (strength loss rate ≤5% after 300 freeze-thaw cycles) and carbonation depth tests. As a participating unit in drafting the industry standard "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)", Qinglong's testing procedures fully comply with national-level standard requirements.

### II. GRC (Glass Fiber Reinforced Concrete): Balanced Testing of Structural Safety and Finish Effects

GRC materials are widely used in exterior wall cladding panels and decorative components due to their light weight, high strength, and flexible shaping, with testing focused on physical performance and process quality. In terms of physical performance, flexural strength must reach 12MPa or above; GRC components produced by Qinglong, through the incorporation of alkali-resistant glass fibers and optimized mix ratios, achieve measured flexural strength of 18-22MPa, while apparent density is controlled at 1800-2000kg/m³ to ensure installation safety. Process quality testing covers indicators such as surface flatness (tolerance ≤3mm/m), pull-out force of embedded parts (≥15kN), and water absorption (≤8%), and toughness is verified through an impact resistance test (no cracks when a 1kg steel ball is dropped from a height of 1m). As Vice Chairman Unit of the China GRC Association, Qinglong has established a comprehensive quality traceability system, with every batch of GRC products accompanied by a detailed test report.

### III. GRG (Glass Fiber Reinforced Gypsum Moldings): Core Control of Environmental Friendliness and Acoustic Performance

As a high-end interior decoration material, GRG testing focuses on environmental friendliness and functional characteristics. Environmental testing must comply with the GB 18582-2008 standard "Limit of Harmful Substances in Interior Wall Coatings for Interior Decoration and Renovation Materials", with formaldehyde emission ≤0.1mg/m³ and VOC content ≤100g/L. Acoustic performance is a key advantage of GRG: sound absorption coefficient testing (sound absorption coefficient ≥0.5 within the 125-4000Hz frequency range) ensures it meets the acoustic design requirements of theaters, concert halls, and other venues. In addition, moisture deflection (deflection ≤L/2000 after 28 days in a 95% relative humidity environment, where L is the component length) and fire rating (meeting Class A non-combustible standard) must also be tested. Thanks to refined production processes, Qinglong's GRG products exceed the industry average in multiple indicators. For more industry information: WeChat qlfsbl123

### IV. GRP (Glass Reinforced Thermosetting Plastic): Rigorous Verification of Weather Resistance and Molding Precision

GRP materials are commonly used for outdoor special-shaped components and anti-corrosion environments, and must pass weather resistance and molding quality testing before shipment. Weather resistance testing includes artificial accelerated aging tests (gloss retention ≥80% and tensile strength retention ≥90% after 1000 hours of UV aging) and chemical corrosion resistance tests (weight change rate ≤1% after 30 days of immersion in a 5% sulfuric acid solution). In terms of molding precision, dimensional deviation must be controlled within ±2mm, and the surface must be free of defects such as bubbles and cracks; for translucent GRP components, light transmittance (≥85%) and uniformity must also be tested. Qinglong's GRP production base is equipped with advanced compression molding equipment, ensuring the dimensional stability and surface texture of complex-shaped components.

### V. Universal Testing for All Product Categories: Full-Process Quality Control from Raw Materials to Finished Products

In addition to material-specific testing, Qinglong Group implements full-process quality control on all products. At the raw material stage, core raw materials such as cement, glass fiber, and resin are strictly screened, with incoming inspection conducted for each batch; during production, parameters such as molding temperature and pressure are monitored in real time through an online monitoring system; at the finished product stage, 3D laser scanning technology is used for dimensional verification, and 3% of products are sampled for destructive testing. As a National High-Tech Enterprise and a Specialized, Refined, Distinctive, and Innovative Enterprise, Qinglong has established a provincial-level R&D center and engineering technology center, equipped with internationally advanced testing equipment to ensure 100% qualified products before shipment. From real estate projects to municipal engineering, from domestic landmarks to overseas projects, Qinglong, guided by the quality philosophy of "meticulous and striving for excellence", provides reliable UHPC/GRC/GRG/GRP solutions for global customers. For more industry information: WeChat qlfsbl123