ASTM C920-11 pdf free.Standard Specification for Elastomeric Joint Sealants.
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.
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 permit 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 of at least 100% and a 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.
4.1.6 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.
5. Materials and Manufacture
5.1 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. The sealant when completely cured shall form an elastomeric solid capable of maintaining a seal.
5.2 A multicomponent chemically curing sealant shall be furnished in two or more components. The resulting mixture shall be uniform and of a consistency suitable for immediate application by hand or pressure caulking gun, or by hand tool The sealant when completely cured shall form an elastomeric solid capable of maintaining a seal.ASTM C920-11 pdf free download.