Rubber Manufacturers Association Natural Rubber Sheet Tolerances

Rubber part tolerances are allowable size variations for industrial rubber products.

Rubber manufacturers association natural rubber sheet tolerances.

The scope of this section presents to the user the tolerances and standards the rubber manufacturers are normally able to maintain. These are helpful when designing and producing a part. D3184 11 2018 standard practice for rubber evaluation of nr natural rubber d3194 17. The rma designation is specified as follows.

Rubber manufacturers association a4 tolerance non critical the a2 precision tolerances provide higher precision over a3 general purpose tolerance. Sheet rubber diaphragm sheet as published in rubber manufacturers association sheet rubber handbook dated 1980 thickness tolerances nominal thickness tolerances plus or minus inches millimeters inches millimeters fractions decimals under 1 32 under 0 031 under 0 79 0 010 0 25 1 32 to but not including 1 16 0 031 to 0 062 0 79 to 1 59 0 012 0 30 1 16 to but continue reading. Known also as dimensional tolerances these numbers are given as plus or minus values for a range of part sizes. You can also consult the rma article on factors affecting tolerances of molded rubber products.

Luckily the rubber manufacturer s association has developed a range of tolerances and published it in their rma rubber handbook the most recent of which is the 2005 version. This information may also be suitable for products. The scope of this section presents to the user the tolerances and standards the rubber manufacturers are normally able to maintain. Engineers routinely put dimensions on drawings but did you know that rubber part tolerances and metal part tolerances aren t the same.

These tolerances may be described as shown in this manual or by geometric tolerancing. D2449 88 2020 standard specification for rubber bales from natural sources limit on coating. The rubber manufacturers association gratefully acknowledges the efforts and approval of the following. Rma mo 1 provides the necessary information to designate a dimensional tolerances finish tolerances and flash tolerances for molded rubber parts.

D3157 05 2020 standard test method for rubber from natural sources color. Ed rubber products can assist to this end by furnishing the manu facturers with details covering the application of their parts. The rubber manufacturers association rma now known as the us tire manufacturer s association has published the rma handbook. So what tolerances can be used.

The a1 high precision tolerances can be achieved by individually inspecting and selecting high precision tolerances meeting o rings. The purpose of this handbook is to provide a method for standardizing design requirements for molded rubber products.