Flame-retardant B1 grade polyurethane exterior wall insulation material is based on isocyanate and polyether as main raw materials. Under the action of various additives such as foaming agent, catalyst and flame retardant, it is mixed by special equipment and foamed by high pressure spraying. A high molecular polymer. Polyurethane rigid foam is a new synthetic material with thermal insulation and waterproof function. Its thermal conductivity is low, only 0.022~0.024W/(m?Κ), which is equivalent to half of extruded board. It is the thermal conductivity of all insulation materials. lowest. At present, polyurethane foam is mainly used in building exterior wall insulation, roof waterproofing and heat insulation integration, cold storage insulation, pipeline insulation materials, building boards, refrigerated trucks and cold storage materials. Characteristics of polyurethane exterior wall insulation material: unique impermeability; light roof load; good heat insulation, good insulation performance, remarkable energy saving effect; good engineering quality and long service life; convenient construction and fast progress. 1. Components of dust ring:
4. Wide temperature application range and good chemical stability (depending on the O-ring material)
5. It is suitable for occasions with severe dust and high temperature. Dust Seal Fkm,Dual Loader Cylinder Seals,Oem Dust Seal,Lbh Dust Seal Fkm ZXS SEALING PRODUCTS FACTORY , https://www.zxs-seal.com
Polyurethane, rubber
2. Purpose and function of dust ring:
The dust ring is mainly used to remove dust, sewage and other dirt attached to the piston rod exposed on the external surface of the cylinder and prevent external dust and sewage from entering the hydraulic system. It is suitable for occasions with severe dust and high temperature.
3. Use position of dust ring:
Connection between guide sleeve and piston rod
4. Working principle of dust ring:
1. It has very good scraping effect.
2. Excellent slip performance, high wear resistance and shape stability.
3. It is preferred to be used in hydraulic systems with medium to high loads without creeping effect.
5. What effects will be caused by improper use or operation of dust ring:
1. Improper selection of cavity support material will wear the cavity and piston rod.
2. The size of the friction pair is inappropriate, causing wear.
3. Improper thread guide angle of cylinder barrel and piston end wear the sealing ring.
4. The seal ring is worn due to improper installation guide angle of the seal.
5. The surface of cavity and piston rod is rough, with scratches and worn seals.