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| ITEM | GB/T4100-2006 Appendix G GB REQUIRED STANDARDS | HUIDA STANDARDS |
|---|---|---|
| LENGTH AND WIDTH | ±1mm | ±0.6mm |
| THICKNESS | ±5 | ±4 |
| STAIGHTNESS | ±0.2% and the maximum variation≤2.0mm | ±0.12% and the maximum variation≤1.0mm |
| WEDGING | length≤600mm，±0.2% and the maximum variation≤20mm length＞600mm，length difference of opposite length and length difference of diagnal length≤2.0mm | length≤600mm，±0.12% and the maximum variation≤0.6mm length＞600mm，length difference of opposite length≤1.0mm，length difference of diagnal length≤1.5mm |
| SURFACE FLATNESS | length≤600mm，±0.2% and the maximum variation≤2.0mm length＞600mm，the maximum variation of upper convex and concave downward≤2.0mm | length≤600mm，±0.12%and the maximum variation≤0.6mm length＞600mm，the maximum variation of upper convex and concave downward≤1.5mm |
| SURFACE QUALITY | from 1 m to observe, at least 95% of the brick its main area without obvious defects | from 0.5 m to observe, at least 95% of the brick its main area without obvious defects |
| WATER ABSORPTION | average≤0.5% individual≤0.6% | average≤0.1% individual≤0.12% |
| DISRUPTIVE STRENGTH （N) | THICKNESS≥7.5mm,≥1300N | THICKNESS≥7.5mm,≥1500N |
| BROKEN VALUE(Mpa) | average≥35MPa minimum individual≥32MPa | average≥38MPa minimum individual≥35MPa |
| ABRASION RESISTANCE | ≤175mm² | ≤150mm² |
| THERMAL EXPANSION COEFFICIENT | non-mandatory | no crack after ten times cycle test between 15℃ and 145℃ |
| FROST RESISTANCE | no crack or crazing after test | no crack or crazing after test |
| GLOSSINESS | ≥55° | ≥60° |
| DIRT RESISTANCE | non-mandatory（class 1-5） | ≥class 3 |
| CORROSION RESISTANT | ≥GB | ≥GLA |
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