In order to reduce the expansion stress resulting from cement's expansion and prolong the life-span of porcelain insulator, a thin asphalt buffer layer is coated between the porcelain and the cement.

Methods: Based on several reported SDS-PAGE systems for low molecular weight protein, the buffer systems, concentrations of separating gel and stacking gel, electrophoresis procedures were optimized.

Toy tires, wheel cover, track washer, bumper, hard-rubber wheel shock absorber.