ASTM C1355/C1355M-96

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Designation: C 1355/C 1355M – 96
Standard Specification for
Glass Fiber Reinforced Gypsum Composites
This standard is issued under the fixed designation C 1355/C 1355M; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope Vertical Tube Furnace at 750°C
1.1 This specification covers glass fiber reinforced gypsum
3. Terminology
(GRG) composites having minimum properties and quality
3.1 Definitions—Definitions of terms shall be in accordance
suitable to allow the production of GRG parts for non-loading
with Terminology C 11.
bearing, thin section, ornamental shapes for architectural
3.2 Definitions of Terms Specific to This Standard:
embellishment of interior building construction.
3.2.1 GRG composite, n—a thin section laminate made
1.2 The values stated in either inch-pound units or SI
from the combination of alpha gypsum cement, glass fiber,
(metric) are to be regarded separately as standard. Within the
additives and water.
text, the SI units are shown in brackets. The values stated in
3.2.2 GRG part, n—an individual molded component used
each system shall be independent of the other. Values from the
as architectural embellishment.
two systems shall not be combined.
1.3 The text of this standard references footnotes which
4. Materials and Manufacture
provide explanatory material. These footnotes shall not be
4.1 Materials:
considered as requirements of the standard.
4.1.1 Alpha Gypsum Cement—Alpha-calcium sulfate
hemihydrate-plaster which is noncombustible, has a low water
2. Referenced Documents
demand, neutral (pH) or low alkalinity, and a purity of not less
2.1 ASTM Standards:
than 90 % by weight of CaSO ·2H O.
4 2
C 11 Terminology Relating to Gypsum and Related Build-
2 4.1.2 “E” Glass Fiber—Chopped glass fiber strands or
ing Materials and Systems
continuous strand mats of calcia-alumina silicate glasses con-
C 472 Test Methods for Physical Testing of Gypsum, Gyp-
forming to Specification D 578.
sum Plasters, and Gypsum Concrete
4.1.3 Water—Potable water.
C 473 Test Methods for Physical Testing of Gypsum Board
4.1.4 Additives—In accordance with the alpha gypsum ce-
Products and Gypsum Lath
ment manufacturer’s specifications.
C 947 Test Method for Flexural Properties of Thin-Section
4.2 Manufacturer’s Certification of Raw Materials:
Glass Fiber Reinforced Concrete (Using Simple Beam
3 4.2.1 Alpha Gypsum Cement—Each lot of alpha gypsum
with Third-Point Loading)
cement shall be certified to be in compliance with 4.1 and 5.1.
D 256 Test Methods for Determining the Pendulum Impact
4 4.2.2 Glass Fiber Reinforcement—Each lot of glass fiber
Resistance of Specimens of Plastics
reinforcement shall be certified to be in compliance with
D 578 Specification for Glass Fiber Strands
Specification D 578.
D 696 Test Method Coefficient of Linear Thermal Expan-
4 4.3 Composite Preparation:
sion of Plastics Between − 30°C and 30°C
4.3.1 Prepare a flat, rectangular composite of sufficient size
D 2583 Test Method for Indentation Hardness of Rigid
6 to obtain specimens required in 5.2. The composite prepared
Plastics by Means of a Barcol Impresser
shall be the same formula as the intended GRG part.
E 84 Test Method for the Surface Burning Characteristics of
Building Materials
5. Mechanical Properties
E 136 Test Method for the Behavior of Materials in a
5.1 Neat Alpha Gypsum Cement:
5.1.1 Normal Consistency shall be not more than 30 when
This specification is under the jurisdiction of ASTM Committee C-11 on tested in accordance with Test Methods C 472.
Gypsum and Related Building Materials and Systems and is the direct responsibility
5.1.2 Compressive Strength shall be not less than 6000 psi
of Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
(41.4 MPa) when tested in accordance with Test Methods
Current edition approved Nov. 10, 1996. Published January 1997.
C 472.
Annual Book of ASTM Standards, Vol 04.01.
Annual Book of ASTM Standards, Vol 04.05.
5.1.3 Hardness shall be not less than 33 Barcol when tested
Annual Book of ASTM Standards, Vol 08.01.
in accordance with Test Method D 2583.
Annual Book of ASTM Standards, Vol 07.01.
5.2 Composite:
Annual Book of ASTM Standards, Vol 08.02.
Annual Book of ASTM Standards, Vol 04.07. 5.2.1 Specimen Preparation
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