ASTM C1355/C1355M-96(2020)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C1355/C1355M −96 (Reapproved 2020)
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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope With Third-Point Loading)
D256Test Methods for Determining the Izod Pendulum
1.1 This specification covers glass fiber reinforced gypsum
Impact Resistance of Plastics
(GRG) composites having minimum properties and quality
D578Specification for Glass Fiber Strands
suitable to allow the production of GRG parts for non-loading
D696Test Method for Coefficient of LinearThermal Expan-
bearing, thin section, ornamental shapes for architectural
sion of Plastics Between −30°C and 30°C with a Vitreous
embellishment of interior building construction.
Silica Dilatometer
1.2 The values stated in either inch-pound units or SI
D2583Test Method for Indentation Hardness of Rigid Plas-
[metric] are to be regarded separately as standard. Within the
tics by Means of a Barcol Impressor
text, the SI units are shown in brackets. The values stated in
E84Test Method for Surface Burning Characteristics of
each system shall be independent of the other. Values from the
Building Materials
two systems shall not be combined.
E136TestMethodforAssessingCombustibilityofMaterials
1.3 The text of this standard references footnotes which Using a Vertical Tube Furnace at 750°C
provide explanatory material. These footnotes shall not be
3. Terminology
considered as requirements of the standard.
3.1 Definitions:Definitions of terms shall be in accordance
1.4 This international standard was developed in accor-
with Terminology C11.
dance with internationally recognized principles on standard-
3.2 Definitions of Terms Specific to This Standard:
ization established in the Decision on Principles for the
3.2.1 GRG composite, n—athinsectionlaminatemadefrom
Development of International Standards, Guides and Recom-
the combination of alpha gypsum cement, glass fiber, additives
mendations issued by the World Trade Organization Technical
and water.
Barriers to Trade (TBT) Committee.
3.2.2 GRG part, n—an individual molded component used
2. Referenced Documents as architectural embellishment.
2.1 ASTM Standards:
4. Materials and Manufacture
C11Terminology Relating to Gypsum and Related Building
4.1 Materials:
Materials and Systems
4.1.1 Alpha Gypsum Cement—Alpha-calcium sulfate
C472Test Methods for Physical Testing of Gypsum, Gyp-
hemihydrate-plaster which is noncombustible, has a low water
sum Plasters, and Gypsum Concrete
demand, neutral (pH) or low alkalinity, and a purity of not less
C473Test Methods for Physical Testing of Gypsum Panel
than 90% by weight of CaSO ·2H O.
4 2
Products
4.1.2 “E” Glass Fiber—Chopped glass fiber strands or
C947Test Method for Flexural Properties of Thin-Section
continuous strand mats of calcia-alumina silicate glasses con-
Glass-Fiber-Reinforced Concrete (Using Simple Beam
forming to Specification D578.
4.1.3 Water—Potable water.
1 4.1.4 Additives—In accordance with the alpha gypsum ce-
This specification is under the jurisdiction of ASTM Committee C11 on
GypsumandRelatedBuildingMaterialsandSystemsandisthedirectresponsibility ment manufacturer’s specifications.
of Subcommittee C11.01 on Specifications andTest Methods for Gypsum Products.
4.2 Manufacturer’s Certification of Raw Materials:
Current edition approved June 1, 2020. Published June 2020. Originally
4.2.1 Alpha Gypsum Cement—Each lot of alpha gypsum
approved in 1996. Last previous addition approved in 2015 as C1355/
C1355M – 96 (2015). DOI: 10.1520/C1355_C1355M-96R20.
cement shall be certified to be in compliance with 4.1 and 5.1.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.2.2 Glass Fiber Reinforcement—Each lot of glass fiber
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
reinforcement shall be certified to be in compliance with
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Specification D578.
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C1355/C1355M − 96 (2020)
4.3 Composite Preparation: 6. Samples Taken at the Point of Manufacture
4.3.1 Prepare a flat, rectangular composite of sufficient size
6.1 When specified by the purchase agreement, samples of
to obtain specimens required in 5.2. The composite prepared
the GRG composite shall be taken a
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