直滑电位器的外壳是封装和保护电位器主要构件的壳体，它起保护内部构件和防尘、防潮的作用。金属外壳也常用以接地，并起屏蔽作用，抑制外界电场的干扰。
     Toy products distribution has become climate, Ying Tong supplies into new development. The Beijing-Kowloon City toys marketing vice president Yang Xin said, now the block toy shopping mall has done relatively mature. 　　
     外壳应具有机械强度高，耐腐蚀和防潮等特点。对要求接地屏蔽的外壳，应用可焊性好的金属材料或铵层。常用的外壳材料有黄铜、钢、铝合金和塑料等。
     Enclosure shall have high mechanical strength, corrosion resistance and moisture characteristics. On requirements of grounding shielding enclosure, using good solderability of metallic material or layer of ammonium. Commonly used housing materials are brass, steel, aluminum alloy and plastic.