RDI Reference

Introduction

ENGINEERING SUPPLEMENT

MOLDED SOLID RUBBER PRODUCTS

This online handbook is offered as a guide to design engineers, purchasing departments and quality control departments of the users of rubber and rubber-like elastomer products.

This handbook is published by Rubber Development, Inc. in conjunction with the molded and extruded rubber manufacturing industries including an expert form the "Rubber Products Handbook"; fourth edition; December, 1984 published by the Rubber Manufacturers Association, 1400 K Street, NW, Washington, D.C. 20005. The purpose of this publication is to provide a uniform method of stating these requirements in a manner readily recognized as a "standard" whereby these various degrees of accuracy and acceptability can be described by general nomenclature.

As you know quality levels and engineering standards both have a direct relationship to the price of a product. For this reason it is important that both are applied with careful consideration in the design phase.

We look forward to working with you to establish the specific level of quality and value that you require and deserve.
MOLDED RUBBER PRODUCTS
PURPOSE AND SCOPE
The purpose of this section is to provide a method for standardizing drawing designations for specific design requirements of molded rubber products. Information set forth on the pages that follow should be helpful to the design engineer in setting up realistic specifications for milled rubber products.

The use of proper symbols by designers in specifying on drawings exactly what is required is a matter of paramount importance. Proper use of these symbols by both product designer and rubber manufacturers will result in a common understanding of the requirements which must be engineered into molded rubber products. To assure a uniform method for use on drawings and in specifications. The symbols on the following pages have been standardized by the Rubber Manufacturers Association for use in the molded rubber field.

Although rubber manufacturers can produce products to high standards of precision, they welcome the opportunity to suggest modifications which would reduce costs. The purchasers of milled rubber products can assist to this end by furnishing the manufacturers with details about the application of their parts.

The scope of this section presents to the user the tolerances and standards the rubber manufacturers are normally able to maintain.

NOTE: Where the term "Rubber" is used in this section, it is intended to include the more common synthetic elastomers as will as natural rubber. Text reference is to material commonly measured with a Shore "A" durometer. The applicability of this information to thermoplastic rubbers has not been determined.

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TO STANDARDS FOR TOLERANCES