quartzstone is made up of 90%-93% natural quartz mixed with resin,granite power,christobalite,pigments by high technology machine in high pressure and under vacuum state.The following specification of quartz slab is for your choice or it can be customized according to your demand:Thickness: from 8mm to 30mmBiggest size:3030*1530mmColor:More than 50 colors are availableTech Data:Test SpecificationUnitStandard RequirementResultSand Hole__No 2mm or larger sand holes on front surfaceNoneScratch__No obvious scratch, 1.5m from eyes measurementNoneCrackFront__No cracksNoneBottom__No cracks larger than 1/4 of the length the crack extendedNonePlaness Tolerance (Length400mm≤0.500.08Angle Tolerance (Length400mm≤0.400.1Desityg/cm3≥2.52.4Water Absorption≤0.20.06Flexible StrengthDryMpa≥1649.7Compressive StrengthDryMpa≥90203Mohs Hardness__≥35.6RadiactivityA: IRa≤1.0,Ir≤1.3 B: IRa≤1.3,Ir≤1.9 C: Ir≤2.8IRa=0.07, Ir=0.14engineered quartzstone is made up of 90%-93% natural quartz mixed with resin,granite power,christobalite,pigments by high technology machine in high pressure and under vacuum state.The following specification of quartz slab is for your choice or it can be customized according to your demand:Thickness: from 8mm to 30mmBiggest size:3030*1530mmColor:More than 50 colors are availableTech Data:Test SpecificationUnitStandard RequirementResultSand Hole__No 2mm or larger sand holes on front surfaceNoneScratch__No obvious scratch, 1.5m from eyes measurementNoneCrackFront__No cracksNoneBottom__No cracks larger than 1/4 of the length the crack extendedNonePlaness Tolerance (Length400mm≤0.500.08Angle Tolerance (Length400mm≤0.400.1Desityg/cm3≥2.52.4Water Absorption≤0.20.06Flexible StrengthDryMpa≥1649.7Compressive StrengthDryMpa≥90203Mohs Hardness__≥35.6RadiactivityA: IRa≤1.0,Ir≤1.3 B: IRa≤1.3,Ir≤1.9 C: Ir≤2.8IRa=0.07, Ir=0.14