ASTM C920 PDF

Document Center Inc. The following bibliographic material is provided to assist you with your purchasing decision: This specification covers the properties of a cured single- or multicomponent cold-applied elastomeric joint sealant for sealing, caulking, or glazing operations on buildings, plazas, and decks for vehicular or pedestrian use, and types of construction other than highway and airfield pavements and bridges. A single-component sealant shall be a uniform mixture of a consistency suitable for immediate application by hand or pressure caulking gun or by hand tool. A multicomponent chemically curing sealant shall be furnished in two or more components.

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ASTM C Abstract This specification covers the properties of a cured single- or multicomponent cold-applied elastomeric joint sealant for sealing, caulking, or glazing operations on buildings, plazas, and decks for vehicular or pedestrian use, and types of construction other than highway and airfield pavements and bridges. A single-component sealant shall be a uniform mixture of a consistency suitable for immediate application by hand or pressure caulking gun or by hand tool. A multicomponent chemically curing sealant shall be furnished in two or more components.

Grade P pourable or selfleveling sealant shall have the required flow characteristics, it shall exhibit a smooth, level surface. Grade NS or gunnable sealant shall have the required flow characteristics such that when tested in vertical displacement. Type S, grade P, and grade NS sealant shall not be less than the given extrusion rate when tested. Type M and grade P sealant, when tested shall be not less than the given extrudable rate 3 h after mixing.

Use T traffic sealant shall have a hardness reading, after being properly cured, of not less than 25 or more than 50 when tested. Use NT nontraffic sealant shall have a hardness reading, after being properly cured, of not less than 15 or more than 50 when tested. There shall be no transfer of the sealant to the polyethylene film when tested at 72 h. The sealant shall not cause any visible stain on the top surface of a white cement mortar base when tested.

The adhesion and cohesion after cyclic movement shall be tested to meet the requirements prescribed.

The adhesion-in-peel test shall be performed to meet the requirements precribed. The adhesion-in-peel after ultraviolet exposure through glass shall be determined to meet the requirements prescribed. The accelerated weathering effects, and sealants exposed to continuous immersion shall be determined to meet the requirements prescribed.

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. Significance and Use 7. It should be recognized by the purchaser or design professional that not all sealants meeting this specification are suitable for all applications and all substrates.

It is essential, therefore, that the applicable type, grade, class, and use be specified so that the proper classification of sealant is provided for the intended use. Test methods relate to special standard specimen substrates of mortar, glass, and aluminum.

If tests are required using substrates in addition to or other than the standard, they should be so specified for testing. Scope 1. The values given in parentheses are for information only.

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More C A single-component sealant shall be a uniform mixture of a consistency suitable for immediate application by hand or pressure caulking gun or by hand tool. A multicomponent chemically curing sealant shall be furnished in two or more components. Grade P pourable or selfleveling sealant shall have the required flow characteristics, it shall exhibit a smooth, level surface. Grade NS or gunnable sealant shall have the required flow characteristics such that when tested in vertical displacement. Type S, grade P, and grade NS sealant shall not be less than the given extrusion rate when tested.

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