The rubber seals for centrifugal smearing machine adopt VD structural form, their mainly actuating medium is oil and hot water, and apply to the rotor whose circumferential velocity less than 19 m/s. The seals are made of NBR, that offer many characteristics such as oil-resistant, hard wearing and heat resistant. The dimensions of the seals meet the requirement of JB/T 6994. The external of the rubber covered rotary shaft lip seals are made of canvas filler rubber, the internal of which have a metal spring