ASTM C461 - 81(2008)

    Standard Test Methods for Mastics and Coatings Used With Thermal Insulation

    Active Standard ASTM C461 | Developed by Subcommittee: C16.33

    Book of Standards Volume: 04.06

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    These test methods cover procedures for sampling and testing mastics and coatings for use as weather and vapour barrier finishes on thermal insulations and for other accessory use. Take the samples for laboratory examination from the original containers immediately after stirring to a uniform condition. Determine the number of containers sampled as required representing a shipment. Open the original containers and examine them for uniformity of contents. The procedures for determining the stability of coatings under freezing are presented in details. The paper covers the determination of the volume of volatile matter and the coverage per unit of dry film thickness of mastics and coatings. Application of the material to the test panels shall meet the requirements prescribed, or to the thickness and by the method to be followed in practice, such as spray, brush, or trowel. Test the coated panel prepared in accordance with the required method at 15-min intervals to determine the time required to set-to-touch, and at 30-min intervals to determine the time to reach practical hardness.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    1. Scope

    1.1 These test methods cover procedures for sampling and testing mastics and coatings for use as weather and vapor barrier finishes on thermal insulations and for other accessory use.

    1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

    1.3 The test methods appear in the following order:

    Uniformity and Storage Stability5
    Stability Under Freezing6
    Density and Weight per Gallon7
    Solids Content9
    Content of Volatiles and Coverage of Mastics and Coatings10
    Drying Time12
    Flash Point13

    1.4 This standard does not purport to address all of the safety concerns, 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.

    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

    C168 Terminology Relating to Thermal Insulation

    C419 Practice for Making and Curing Test Specimens of Mastic Thermal Insulation Coatings

    D56 Test Method for Flash Point by Tag Closed Cup Tester

    D71 Test Method for Relative Density of Solid Pitch and Asphalt (Displacement Method)

    D93 Test Methods for Flash Point by Pensky-Martens Closed Cup Tester

    D140 Practice for Sampling Bituminous Materials

    D217 Test Methods for Cone Penetration of Lubricating Grease

    D2196 Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational (Brookfield type) Viscometer

    D3278 Test Methods for Flash Point of Liquids by Small Scale Closed-Cup Apparatus

    ICS Code

    ICS Number Code 27.220 (Heat recovery. Thermal insulation)

    UNSPSC Code

    UNSPSC Code 30141500(Thermal insulation)

    DOI: 10.1520/C0461-81R08

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