ASTM C920-2018 pdf free download

ASTM C920-2018 pdf free download.Standard Specification for Elastomeric Joint Sealants
1. Scope
1.1 This ASTM 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. 1.2 A sealant meeting the requirements of this specification shall be designated by the manufacturer to be one or more of the types, classes, grades, and uses defined in Section 7. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.4 This standard is similar, but not identical, to ISO 11600 and ISO 11618. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
4. Classification of Sealants
4.1 A sealant qualifying under this specification shall be classified as to type, grade, class, and use as follows: 4.1.1 Type S—A single-component sealant. 4.1.2 Type M—A multicomponent sealant. 4.1.3 Grade P—A pourable or selfleveling sealant that has sufficient flow to form a smooth, level surface when applied in a horizontal joint at 4.4°C (40°F). 4.1.4 Grade NS—A nonsag or gunnable sealant that permits application in joints on vertical surfaces without sagging or slumping when applied at temperatures between 4.4 and 50°C (40 and 122°F). 4.1.5 Class 100/50—A sealant that when tested for adhesion and cohesion under cyclic movement (8.8) shall withstand an increase ofat least 100 % and a decrease ofat least 50 % ofthe joint width as measured at the time of application, and, in addition, meet all the requirements of this specification.4.1.6 Class 50—A sealant that when tested for adhesion and cohesion under cyclic movement (8.8) shall withstand an increase and decrease of at least 50 % of the joint width as measured at the time of application, and, in addition, meet all the requirements of this specification. 4.1.7 Class 35—A sealant that when tested for adhesion and cohesion under cyclic movement (8.8) shall withstand an increase and decrease of at least 35 % of the joint width as measured at the time of application, and, in addition, meet all the requirements of this specification. 4.1.8 Class 25—A sealant that when tested for adhesion and cohesion under cyclic movement (8.8) shall withstand an increase and decrease of at least 25 % of the joint width as measured at the time of application, and, in addition, meet all the requirements of this specification. 4.1.9 Class 12 1 ⁄ 2 —A sealant that when tested for adhesion and cohesion under cyclic movement (8.8) shall withstand an increase and decrease of at least 12 1 ⁄ 2 % of the joint width as measured at the time of application, and, in addition, meet all the requirements of this specification. 4.1.10 Use T 1 —A sealant designed for use in joints in pedestrian and vehicular traffic areas such as walkways, plazas, decks and parking garages where a higher durometer sealant is desired. 4.1.11 Use T 2 —A sealant designed for use in joints in pedestrian and vehicular traffic areas such as walkways, plazas, decks and parking garages where a lower durometer sealant is desired. N OTE 1—Hardness alone does not correlate with joint performance. The joints in pedestrian and vehicular traffic areas such as walkways, plazas, decks, and parking garages require appropriate design considerations including material selection, total joint design, manufacturer involvement and field testing.4.1.12 Use NT—A sealant designed for use in joints in nontraffic areas. 4.1.13 Use I—A sealant designed for use in joints which are submerged continuously in a liquid. 4.1.14 Use M—A sealant that meets the requirements ofthis specification when tested on mortar specimens in accordance with 9.9 and 9.10. 4.1.15 Use G—A sealant that meets the requirements of this specification when tested on glass specimens in accordance with 9.9 – 9.11. 4.1.16 Use A—A sealant that meets this specification when tested on aluminum specimens in accordance with 9.9 and 9.10. 4.1.17 Use O—A sealant that meets this specification when tested on substrates other than the standard substrates in accordance with 9.9 and 9.10.