DynaPlast® GRG XL2017-10-03T15:22:04+00:00

DynaPlast® GRG XL

DynaPlast® GRG XL is a low expansion gypsum cement formulated for glass fiber reinforced gypsum (GFRG) fabricators. The cement is an alpha hemihydrate gypsum-based material that meets the “Standard Specifications for Glass Fiber Reinforced Gypsum Composites” as outlined in ASTM C-1355.

DynaPlast® GRG XL is a high-strength, fire retardant, dense gypsum cement that can be used with glass fibers or glass mat for light-weight thin cast architectural pieces. The product can be used in spray-up applications using chopped E glass fibers or can be used in hand layup applications with continuous strand glass fiber mats specifically designed to insure proper wet-out with the gypsum slurry.

DynaPlast® GRG XL is white in color. Applications include column covers, decorative interior architectural molded panel products, fireplace mantels and surrounds and other thin-walled glass reinforced cast pieces.


  • Use Consistency – 33-35 cc/100g
  • Set Time – 45 – 65 minutes
  • Maximum Expansion (%) – 0.175%
  • -100 Mesh – 99.8 – 100% passing
  • Compressive Strength – 7,000 psi


When mixing with 50% by weight using fine sand, add 4cc/100 grams of water to the mix. It is not recommended to exceed the 50% upper limit on aggregate addition because excess aggregate can settle out of the slurry.

Products must be mixed with high-shear mixing equipment.

Support Documents

Safety Data Sheet (SDS) for DynaPlast® GRG XL

Safety Data Sheet
Safety Data Sheet

Product Data Sheet for DynaPlast® GRG XL

Product Data Sheet
Product Data Sheet

To Purchase This Product Please Contact

ACG Materials provides plaster solutions
for companies around the world.