Sealant can be divided into three categories: elastic sealant, liquid gasket and sealing putty.

According to the classification of chemical composition, it can be divided into rubber type, resin type, oil-based type and natural polymer sealant.
Rubber type: This type of sealant is based on rubber. Commonly used rubbers are polysulfide rubber, silicone rubber, polyurethane rubber, neoprene rubber and butyl rubber.
Resin type: This type of sealant is based on resin. Commonly used resins are epoxy resin, unsaturated polyester resin, phenolic resin, polyacrylic resin, polyvinyl chloride resin and so on.
Oil-based type: This type of sealant uses oil as the base material. Commonly used oils include various vegetable oils such as linseed oil, castor oil and tung oil, as well as animal oils, such as fish oil.

According to the application, it can be divided into high temperature resistant type, cold resistant type, pressure resistant type and so on.

According to the classification of film-forming properties, it can be divided into dry adhesion type, dry peelable type, non-dry viscous type and semi-dry viscoelastic type. This is also the commonly used sealant classification method in China.

Classified by use, it can be divided into construction sealants, automotive sealants, insulation sealants, packaging sealants, mining sealants, etc.

According to the performance classification after construction, it can be divided into two types: curing type sealant and semi-curing type sealant. Among them, curing type sealant can be divided into rigid and flexible. The solid formed after vulcanization or solidification of rigid sealant is rarely elastic. , Can not be bent, usually the seam cannot be moved; the flexible sealant has elasticity and softness after vulcanization. Non-curing sealant is a soft coagulant sealant that remains non-drying after construction and the tackifier continuously migrates to the surface state.