As suggested above, time gravity fillers are often used for filling of corrosive products. But sometimes the products being filled are so aggressive that special construction methods are required. Harsh factory environments or where the product being filled can also be particularly aggressive on machinery. This includes not only chemical plants plants producing strong acids or bleach but also food plants using brine or sugar solutions in their products. In both cases, even the factory air alone contributes to the accelerated degradation of the machinery.
Machine integrity can be enhanced by using special powder and industrial polymer coatings on structural and other exposed machinery components. Also, whenever practical, substitution of chemical resistant plastics such as UHMW and Teflon are used in place of metal.
Not only are the frame components at risk in these environments but the fluid path materials must be specifically chosen for the types of products they come into direct contact with. For example, Kynar and Teflon fluid path materials may be used in a bleach bottle filler because of their excellent resistance to the aggressive properties of bleach.