ASTM C1355/C1355M-96(2001)

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Designation: C 1355/C 1355M – 96 (Reapproved 2001)
Standard Specification for
Glass Fiber Reinforced Gypsum Composites
This standard is issued under the fixed designation C1355/C1355M; 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 E84 TestMethodfortheSurfaceBurningCharacteristicsof
Building Materials
1.1 This specification covers glass fiber reinforced gypsum
E136 Test Method for the Behavior of Materials in a
(GRG) composites having minimum properties and quality
Vertical Tube Furnace at 750°C
suitable to allow the production of GRG parts for non-loading
bearing, thin section, ornamental shapes for architectural
3. Terminology
embellishment of interior building construction.
3.1 Definitions: Definitions of terms shall be in accordance
1.2 The values stated in either inch-pound units or SI
with Terminology C11.
(metric) are to be regarded separately as standard. Within the
3.2 Definitions of Terms Specific to This Standard:
text, the SI units are shown in brackets. The values stated in
3.2.1 GRG composite, n—a thin section laminate made
each system shall be independent of the other. Values from the
from the combination of alpha gypsum cement, glass fiber,
two systems shall not be combined.
additives and water.
1.3 The text of this standard references footnotes which
3.2.2 GRG part, n—an individual molded component used
provide explanatory material. These footnotes shall not be
as architectural embellishment.
considered as requirements of the standard.
4. Materials and Manufacture
2. Referenced Documents
4.1 Materials:
2.1 ASTM Standards:
4.1.1 Alpha Gypsum Cement—Alpha-calcium sulfate
C11 Terminology Relating to Gypsum and Related Build-
hemihydrate-plaster which is noncombustible, has a low water
ing Materials and Systems
demand, neutral (pH) or low alkalinity, and a purity of not less
C472 Test Methods for Physical Testing of Gypsum, Gyp-
than 90% by weight of CaSO ·2H O.
4 2
sum Plasters, and Gypsum Concrete
4.1.2 “E” Glass Fiber—Chopped glass fiber strands or
C473 Test Methods for Physical Testing of Gypsum Board
2 continuous strand mats of calcia-alumina silicate glasses con-
Products and Gypsum Lath
forming to Specification D578.
C947 Test Method for Flexural Properties of Thin-Section
4.1.3 Water—Potable water.
Glass Fiber Reinforced Concrete (Using Simple Beam
3 4.1.4 Additives—In accordance with the alpha gypsum ce-
with Third-Point Loading)
ment manufacturer’s specifications.
D256 Test Methods for Determining the Pendulum Impact
4 4.2 Manufacturer’s Certification of Raw Materials:
Resistance of Specimens of Plastics
5 4.2.1 Alpha Gypsum Cement—Each lot of alpha gypsum
D578 Specification for Glass Fiber Strands
cement shall be certified to be in compliance with 4.1 and 5.1.
D696 Test Method Coefficient of Linear Thermal Expan-
4 4.2.2 Glass Fiber Reinforcement—Each lot of glass fiber
sion of Plastics Between−30°C and 30°C
reinforcement shall be certified to be in compliance with
D2583 Test Method for Indentation Hardness of Rigid
6 Specification D578.
Plastics by Means of a Barcol Impresser
4.3 Composite Preparation:
4.3.1 Prepare a flat, rectangular composite of sufficient size
to obtain specimens required in 5.2. The composite prepared
This specification is under the jurisdiction of ASTM Committee C11 on
shall be the same formula as the intended GRG part.
GypsumandRelatedBuildingMaterialsandSystemsandisthedirectresponsibility
of Subcommittee C11.01 on Specifications andTest Methods for Gypsum Products.
Current edition approved Nov. 10, 1996. Published January 1997. 5. Mechanical Properties
Annual Book of ASTM Standards, Vol 04.01.
5.1 Neat Alpha Gypsum Cement:
Annual Book of ASTM Standards, Vol 04.05.
Annual Book of ASTM Standards, Vol 08.01.
Annual Book of ASTM Standards, Vol 07.01.
6 7
Annual Book of ASTM Standards, Vol 08.02. Annual Book of ASTM Standards, Vol 04.07.
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C 1355/C 1355M
5.1.1 Normal Consistency shall be not more than 30 when 7. Number of Tests and Retests
tested in accordance with Test Methods C472.
7.1 The number of tests and type of tests to be performed
5.1.2 Compressive Strength shall be not l
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