Specification

Product Data Materials: Panels with gypsum core, paper encased, square or taped edges.
Compliance with Standards: I MPERIAL Brand Gypsum Base meets ASTM Designation C588.
Thermal coefficient of expansion (unrestrained): 9.2x10
–6
in./in. x °F (40-100 °F); 16.2 mm/km x °C (4-38 °C).
Thermal resistance value: R = 0.45 (1/29 base), 0.56 (5/89 base).
Hygrometric coefficient of expansion (unrestrained): 7.2x10
–6
in./in. x °F (7.2 mm/km x °C) at 5-90% R.H.
Vapor Permeance: Vapor Permeance is 0.06 perms for Foil-Back I MPERIAL Brand Gypsum Base. This product is available in all
sizes and core types.
Storage: Store material in a cool, dry place. Avoid direct sunlight. Maintain temperature above 40 °F (4 °C).
Availability and Cost: I MPERIAL Brand Gypsum Base is distributed throughout the United States. Contact a United States Gyp-
sum Company sales office or sales person for additional information.
Types, sizes, packaging and weights:
Approximate weight
Thickness Width Length
Pc./ lb./ kg/
Product in. mm in. mm ft. mm bdl. 1000ft.
2
100m
2
I MPERIAL Base
Regular 1/2 12.7 48 1219.2 8 to 2 1820 890
Regular 5/8 15.9 48 1219.2 14 2438.4 2 2320 1130
Foil-Back 1/2 12.7 48 1219.2 8 to to 2 1820 890
Foil-Back 5/8 15.9 48 1219.2 14 4267.2 2 2320 1130
Submittal Job Name
Approvals:
Contractor Date