ASTM Standard and Applied Worldwide

Cellular glass is made of one hundred percent pure glass in a basic block foam. Blocks can be fabricated into wide range of shapes and sizes to satisfy customers.

Physical Properties of Cellular Glass Insulation- Type ZES 800
SI ENGLISH Method Method
Density 120 kg/m3 7.5lb/ft3 C 303 EN 1602
Thermal conductivity W/mK
0.043 @10℃ 0.045 @24℃
Btu-in/hr.ft2.°F 0.314 @ 50°F 0.327 @ 75°F C177 C158 EN 12667 EN 12939
Compressive strength Block .62Mpa 90Psi C165 EN 826
Strength for flat surfaces with hot asphalt C240 C552 EN 826 Method A
Absorption of Moisture (Water % by Volume) 0.20% 0.20%


EN 1609 EN 12087
Linear Coefficient of Thermal Expansion 9.0 x 10-6/°F 25℃ to 300℃ 5.0 x 10-6/°F 75°F to 575°F E228 EN 13471
Hygroscopicity No increase in weight at 90% relative humidity  
Water-Vapor Permeability 0.00 perm-cm 0.00 perm-in E96 Wet Cup procedure B EN 12086
EN ISO 10456
Acid Resistance Impervious to common acids except hydrofluoric acids
Capillarity None  
Combustibility & reaction to fire Noncombustible-will not burn Flame Spread 0
Smoke Development 0
E136 E84 EN ISO 1182 (Class A1)
Composition Soda-lime silicate glass - inorganic with no fibers or binders
Dimensional Stability Excellent - does not shrink, , swell or warp EN 1604
Flexural Strength, Block 0.48Mpa 70 psi C203 C240 EN 12089 (BS450)
Modulus of Elasticity, Approx 900 Mpa 1.3 x 105      psi C623 EN 826
Method A1
Specific Heat 0.84 Kj/kg.K 0.18 Btu/lb.°F - -
Thermal Diffusivity 4.2 x 10-7m2/sec 0.016 ft2/hr - -
Maximum Service Temperature 482℃ 900°F - -

Image of IIG Calcium Silicate


  • High compressive strength
  • Low thermal conductivity
  • No water absorption Zero permeability
  • High performance barrier
  • Noncombustible
  • Nontoxic
  • Resistant to pets and vermin


  • Low temperature & cryogenic Cryogenic piping
  • Chilled and hot water lines
  • Heat traced pipes & equipment Hydrocarbon processing
  • Above and below ground steam lines
  • Offshore platforms
  • Cryogenic vessels, equipment & tanks
  • High temperature pipelines Asphalt and hot oil storage tanks


Procedural and random testing of ZES cellular glass during the manufacturing process ensures the most consistent and high performance insulation reaches our customers. Our in-house testing equipment is Calibrated and certified to ensure ASTM performance and quality of ZES Cellular glass.