ASTM C557 – Standard Specification for Adhesives for Fastening Gypsum Wallboard to Wood Framing
ASTM C557 covers the minimum performance standards for and properties of adhesives intended to bond the back surface paper of gypsum wallboard to wood framing
members.
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- Description
- TECHNICAL SPECIFICATIONS
Description
ASTM C557 – Standard Specification for Adhesives for Fastening Gypsum Wallboard to Wood Framing
ASTM C557 covers the minimum performance standards for and properties of adhesives intended to bond the back surface paper of gypsum wallboard to wood
framing members.
Test requirements and test methods for the adhesive used for the application of all thicknesses of gypsum wallboard are also covered.
The specification provides a basis for ensuring the quality of adhesives.
Compression shear test, tensile test, gap filling or bridging characteristics test, freeze-thaw stability test, and accelerated adhesive aging shall be performed on the adhesive.
The tests are suitable for products performance certification and quality control programs and can be useful the general public, adhesive manufacturers,
distributors, specifiers, architects, contractors, testing laboratories and other businesses and professionals.
*** There are two main tests described in C557.
The first and most widely used is the shear test which uses a balanced guillotine style shear fixture.
The second is a tensile test which uses a specialized fixture to pull a rectangular piece of wood off of the drywall.
Geometry
The shear strength test requires a shear fixture built similar to the one used for ASTM D905.
The fixture window is enlarged to accomodate for the 102 x 89 mm (WxH) prepared sample size.
There is also an adjustable sample shelf on the fixture which can accomodate samples 0-32mm in total thickness.
The tensile test fixture is 5″ x 5″ square which can hold the 4 x 4 x 5″ sample. The sample is held on the edges, which allows the test operator to glue the square
wooden specimen to the gypsum drywall.
***PARSROS offers several types of grips and fixtures which will enable you to perform a variety of tests
that are accurate and repeatable.
Similar Specifications
ASTM D905 – Adhesives Wood Shear Fixture
Referenced Documents
ASTM Standards
C1396/C1396M Specification for Gypsum Board
D905 Test Method for Strength Properties of Adhesive Bonds in Shear by Compression Loading
D907 Terminology of Adhesives
E4 Practices for Force Verification of Testing Machines
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
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