What Are the Product Testing Standards of GRC Manufacturers? Qinglong GRC Testing Standard System

GRC product testing follows the national standard GB/T 15231-2018. Testing items cover four major categories: mechanical properties (bending, impact resistance), physical properties (density, water absorption), durability (freeze resistance, impermeability), and appearance quality (dimensions, flatness). Qinglong GRC has established the enterprise standard Q/QL001-2020, with all indicators 10%-20% stricter than the national standard. For example, the national standard requires bending strength ≥18MPa, while the enterprise standard requires ≥20MPa.

Testing methods: bending strength is tested by the three-point bending method with specimens of 1000×100×20mm; freeze resistance by the rapid freezing method with cycles from -20℃ to +20℃; impermeability by the stepwise pressurization method up to 1.2MPa; dimensional accuracy measured with calipers and straightedges. Every batch of Qinglong GRC products is tested according to the standard, with test reports shipped with the goods; the data are authentic and verifiable. Standardized testing, trustworthy quality.

Mechanical Property Testing

Bending strength: three-point bending at a loading rate of 5mm/min; impact resistance: pendulum method with energy increased in steps; compressive strength: compression testing machine at a loading rate of 0.5MPa/s; elastic modulus: slope of the stress-strain curve. Mechanical properties ensure safety.

Physical Property Testing

Density: volume-mass method with an accuracy of 0.1kg/m³; water absorption: 24h immersion, measured by weight change rate; air permeability: measured with a permeability tester; drying shrinkage: measured by length change. Physical properties affect usage.

Durability Testing

Freeze resistance: 50 rapid freeze-thaw cycles with mass loss rate ≤5%; impermeability: 6 pressure levels with penetration height ≤10mm; alkali resistance: immersion in Ca(OH)2 solution for 28 days; carbonation test: CO2 concentration of 20%, measuring carbonation depth. Durability determines service life.

Appearance Quality Inspection

Dimensional deviation: measured with a vernier caliper, accuracy 0.02mm; flatness: inspected with a 2m straightedge and feeler gauge; color difference: colorimeter, ΔE value; surface defects: visual inspection and magnifying glass examination. Appearance quality affects aesthetics.

Strict testing, quality assured. Qinglong GRC conducts standardized testing with authentic and reliable data.