How To: Get a Quote for Rubber

How To: Get a Quote for Rubber

Not all purchasing professionals are aware of the component information required by a rubber manufacturer to quote a rubber project. Occasionally, missing information in a Request for Quote may delay generation of the quotes or hiccups during the pre-production process. On the other hand, excessive requirements may drive up cost on a project or, in worse cases, render a rubber product un-manufacturable. Please read on to learn more about how you can ensure a timely and accurate quote for rubber products.


What You Need (to Get a Quote for Rubber)

Here are the most basic information you need to get a quote for a rubber project:

    1. Engineering Drawing
    2. Material
    3. Estimated Annual Usage

The engineering drawing can be a 2D print or a 3D data file. Ideally, both 2D and 3D drawings should be supplied to the rubber manufacturer for the most accurate quote. All part requirements should be found in the professional 2D drawing. The material, color, test standards, tolerances, and all key characteristics should be clearly identified within the drawing. All dimensions should be accounted for between the combination of the 2D and 3D drawings.

The material call-out should be specific and never be simply “rubber” whenever you request for a quote for rubber. All material call-outs for rubber must include a hardness specification. As you might have noticed, rubber can come in a variety of types from Natural Rubber, SBR, EPDM, to Silicone; and with hardness ranging from hard, medium, soft, to sponge and foam depending on the application required of the part. Take a look at our rubber durometer chart for a list of rubber hardness ratings.

An example of a simple rubber material call-out is “EPDM Rubber 60 +/- 5 Shore A” seen in an engineering drawing sent for a quote for rubber. Notice that the material type is specified as “EPDM Rubber” and thus cannot be mistaken for EPDM sponge or other material types. The hardness is also specified to be within the range of 55 to 65 by the measurement scale of Shore A. Of course, the material specification can sometimes get more complicated for other projects. For more complex material requirements, an ASTM line call-out is typically used.

An estimated annual usage, or EAU, is the quantity of that part you project to purchase within a year. The manufacturer needs this information quote a tool size and design capable of meeting the projected production output.


“No Quote” or High Pricing – Why Did This Happen?

Sometimes you took all the right steps, but you still received a “No Quote” from the manufacturer on your project. Why did this happen? Your first step is to ask the manufacturer. Their estimator should be able to answer your questions about why your project was not able to be quoted. The most common reasons are missing or discrepant information from the above, broken CAD files, or low production EAU.

You may also find that you received a quote for the rubber project, but the cost is much higher than you would have estimated for a product of that type and size. Consider your production EAU – if the production quantity is too low, the manufacturing efficiency will be lower and thus increase cost for the rubber manufacturer. On the technical side, another explanation for the high production cost may be over-engineered specifications. Ask your engineering team to review specifications of the drawing to determine if certain high tolerances, obscure test requirements, or proprietary material brands are truly necessary.


About Coi Rubber Products

Coi Rubber Products, Inc. is a custom manufacturer of molded rubber and plastic components. Coi Rubber has over 28 years of experience in Engineering, Design, Compounding, Prototyping, and Production of molded rubber and plastics. Our capabilities include custom compounding, injection molding, compression molding, transfer molding, extrusions, rubber-to-metal bonding, insert over-molding, and more. We provide large scale production and engineering support to the Automotive, Industrial, Agriculture, Appliance, HVAC industries, and many more. Coi Rubber is IATF 16949:2016 and MBE certified.



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