Assemblies and Tolerances

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Chemical

Design &

Dimensional tolerances are wider for porous plastics than for solid plastic parts. Fortunately, porous plastic parts are resilient, allowing for an interference fit. This eliminates the need for gaskets in many applications. For example:

The inside diameter of a porous plastic part can be smaller than the mating diameter it fits over
A plug or disc may be force-fit into a smaller hole
A porous plastic sheet may be compressed between two rigid surfaces

The higher the void volume, the more resilient the structure. The level of resiliency in decreasing order, by polymer, is polyvinylidene fluoride (PVDF), polypropylene (PP) and polyethylene (PE).

Click here to view the Physical Properties of Polymers chart

It Is Important To Note . . .

Porex cannot anticipate or control the conditions under which the technical data and products may be used. Porex does not guarantee the applicability or accuracy of the information or the suitability of our products in any given situation. Unless otherwise noted, the data on service temperatures; softening and melting points; solvent resistance; coefficient of thermal expansion and tensile strength are for the polymer in solid form. All of these properties will be lower from the porous form of the polymer. Users should make their own tests to determine the suitability of each product for their particular application. The products discussed are sold without such warranty, either expressed or implied. Statements concerning the possible use of Porex products are not intended as recommendations or infringement of any patent.

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