Plastic sealants are hot poured, horizontal joint sealing compouds, black in colours.
Plastic A2: Complies with BS 2499:1973(type A2) a low extension grade for sealing joints in concrete pavements, reservoirs, etc, where joints apacings are not more than 12m.
Plastic A2 also complies with the requirements of the UK Water Research Council for use in contact with potable water approval no. 8810512.
Plastic 77: A hard grade for sealing low movement joints in factory floors and areaa where joints are closely spaced and resistance to grit and traffic is of primer importance. In hot climates, grade 77 is softer and more flexible and is therefore suitable for use in roads, runways, reservoirs, etc.
Plastic 99: Similar in composition to Plastic grade 77 but formulated with a higher softening point for use in hot climates for sealing joints on exposed sites such as unreinforced concrete pavements where other grades would be unacceptably soft. At higher ambient temperatures the properties of Plastic grade 99 approximate to those given for Plastic 77 in temperate climates. It is not suitable for use where temperatures fall below 4°C.
Joint size: Plastic compounds are normally considered suitable for joints up to 30 mm wide in trafficked surfaces, but joints up to 65 mm wide can be sealed with Plastic where the joints are horizontal and are not subject to trafficking. The deoth of the joint seling compound should not exceed 50 mm and for most normal uses, 25 is recommented.
Plastic can be used on inclined surfaces up to about 1 in 20. Extra care must be taken, however, when pouring. Vertical joints, e.g. kerbs, upstands, etc, should be sealed with Plastijoint.
Packaging: Plastic A2 and Plastic 77 are supplied in UK in paper sacks containing 25 kg. All grades of Plastic arae supplied overseas in steel drums containing 50 kg.