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Last Updated: Dec 11, 2015
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ASTM C461-81(2008)
Standard Test Methods for Mastics and Coatings Used With Thermal Insulation
Standard Test Methods for Mastics and Coatings Used With Thermal Insulation
C0461-81R08
ASTM|C0461-81R08|en-US
Standard Test Methods for Mastics and Coatings Used With Thermal Insulation
Standard
C461 Standard Test Methods for Mastics and Coatings Used With Thermal Insulation>
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Abstract
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.
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:
| Section | |
| Sampling | 4 |
| Uniformity and Storage Stability | 5 |
| Stability Under Freezing | 6 |
| Density and Weight per Gallon | 7 |
| Consistency | 8 |
| Solids Content | 9 |
| Content of Volatiles and Coverage of Mastics and Coatings | 10 |
| Build | 11 |
| Drying Time | 12 |
| Flash Point | 13 |
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.