ASTM C1248 - 08(2012)

    Standard Test Method for Staining of Porous Substrate by Joint Sealants

    Active Standard ASTM C1248 | Developed by Subcommittee: C24.40

    Book of Standards Volume: 04.07


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    Significance and Use

    5.1 Staining of building materials is an aesthetically undesirable occurrence. This test method evaluates the likelihood of a sealant causing an early stain on a porous substrate due to exudation of materials from the sealant. Since this is an accelerated test, it does not necessarily predict that the tested sealants will not stain or discolor porous substrates over longer periods of time.

    1. Scope

    1.1 This test method covers four types of laboratory tests to determine if a joint sealant has a probability of staining a porous substrate (such as marble, limestone, sandstone, and granite). The tests are on compressed samples and include (1) storage under standard laboratory conditions, (2) storage in an oven, and (3) exposure in a fluorescent UV/condensation device, and (4) exposure in a xenon arc device.

    1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

    1.3 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

    1.4 The committee with jurisdiction over this standard is not aware of any comparable standards published by other organizations.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    C717 Terminology of Building Seals and Sealants

    C1442 Practice for Conducting Tests on Sealants Using Artificial Weathering Apparatus

    G113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials

    G151 Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources

    G154 Practice for Operating Fluorescent Light Apparatus for UV Exposure of Nonmetallic Materials

    G155 Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-Metallic Materials


    ICS Code

    ICS Number Code 91.100.50 (Binders. Sealing materials)

    UNSPSC Code

    UNSPSC Code 31200000(Adhesives and sealants)


    DOI: 10.1520/C1248-08R12

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