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Custom Elastomer Compounding

A Choice Of High Consistency and Liquid Silicone

C & M Rubber Co. has a longstanding business relationship with many HCR Solid Silicone rubber and LR Liquid Silicone rubber suppliers, including Wacker, Momentive, Dow Corning, and Valley Rubber. Each vendor has a library of silicone compounds to draw from that will meet most if not all material specifications. Using the elastomer of your choice, C & M Rubber Co. has in-house capability to mix a silicone compound or contract with a supplier to mix the compound for your specific application. This choice is driven by monthly quantity required and locking in the most advantageous price.

Color Matching, Durometer, Temperature Resistance

C & M Rubber Co. can color match to the Pantone© Formula Guide. We can also produce a custom compound with the durometer (hardness) granularity to ±5 points. With 53 years of experience, we have catalogued a wide breadth of knowledge in developing compounds that can tolerate wide ranges of temperature, tear resistance, and compression set. From one pound to fifty-pound batches, C & M Rubber Co. can recommend and mix just the right elastomeric compound for your application.

UL/NSF Certification

For applications that require qualified elastomers, C & M Rubber Co. will assist your organization in processing the required documents to apply for UL and /or NSF Certification.

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Flurosilicone Indicator Covering on F14
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Mill Machine
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Mill Room
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Measured Silicone Portioning
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Raw Silicone

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PDFDurometer (PDF - 174KB)
PDFElastomer Compatibility Chart (PDF - 284KB)
PDFElastomer Library (PDF - 375KB)

PDFGlossary of Elastomeric Terms (PDF - 338KB)
PDFRubber Shelf Life (PDF - 209KB)

Custom Elastomer Compounding Capabilities

Compounding Equipment

  • Lescuyer 36" Mill - Adjust. Freq. Drive - 50 lb. Batch Typical - 2 Roll
  • Thropp 12" Mill - 10 lb. Batch Typical - 2 Roll
  • Bolling 12" Mill - Adjustable Frequency Drive - 10-25 lb. Batch Typical- 2 Roll
Preform Extruders 4 Units
Lab Press Carver Laboratory Press - Batch Durometer Testing

Commonly Available Elastomer Materials

Silicone Manufactured by Momentive:
  • SE-6035 -35 Duro - Blending Base
  • SE-6075- 75 Duro - Blending Base
  • SE-6335- 30 Duro - Blending Base - High Strength
  • SE-5559-U- 57 Duro - Flame Retardent - Color Brown Only
  • Tufel® II Platinum Cure - Various Durometer -Commonly used for medical applications.
Manufactured by Dow:
  • HS-30 -30 Duro High Strength - Use alone or blended
  • HS-50 -50 Duro High Strength - Use alone or blended
  • HS-70 -70 Duro High Strength - Use alone or blended
  • GP 50 -50 Duro Base- For smooth shiny surface finish
  • NPC 40 -40 Duro - No post cure required
  • NPC 80 -80 Duro - No post cure required
  • Silastic® 160-60 60 Semi conductive silicone - Resist 10Ohm/cm
  • Silastic® LCS 755 55 Duro - Low compression set
Manufactured Shin-Etsu:
  • SG-135U Base - 35 Duro - General Purpose Base
  • SG-175U Base - 75 Duro - General Purpose Base
Flourosilicone Manufactured by Dow:
  • LS-2840 - 40 Duro Flourosilicone
  • LS-2860 - 75 Duro Flourosilicone
Neoprene, NBR, EPDM, Millable Urethane & Nitrile Manufactured by Valley Rubber:
  • Custom mix to specific customer requirements

General Silicone Characteristics

High Temperature Resistance Silicone elastomers outperform organics with proven temperature resistance up to 600°F. Even under extreme heat, these compounds provide superior tensile strength, elongation and abrasion resistance.
Low Temperature Despite extreme temperatures as low as -100°F, most silicone elastomers retain durometer and modulus. Special grades have brittle points below -150*F and remain serviceable at temperatures as low as -130°F.
Compression Resistance Silicone elastomers offer incomparable resistance to compression set deformation, even at temperatures as low as -120°F or as high as 500°F.
Electrical Properties Silicone elastomers provide unequalled electrical properties over a wide range of temperatures. The rival mica in terms of resistance to high-voltage ionization and corona. Plus, they show far less dielectric fatigue than TFE resins or organic elastomers.
Fire Resistance Underwriters Laboratory Flame Test (UL94) is the standard measure of a materials resistance to burning. This UL test is performed on a test sample 5" x 1.2". A 3/4" Bunsen flame is applied for 10 seconds to a vertically supported sample immersed 3/4" into the flame. The time for burning to cease following the initial 10 second exposure is noted. The flame is applied again for 10 seconds and the time for burning to cease including glowing is noted. A total of 5 samples are tested in this manner. Five additional samples aged for 7 days at 70*C are also tested in this manner.

UL Flame Test Ratings and Results

Rating Required Test Results
94 V-0 5 specimens with 10 flame applications, with none exceeding 10 second flame or 50 second total burn.
94 V-1 5 specimens with 10 flame applications, with none exceeding 30 second flame or 250 second total burn.
94 V-2 Same criteria as for 94 V-1, except some dripping is allowed
94 V-HB 3 specimens none of which has either a burn rate exceeding 3 inches per minute or ceases to burn before reaching reference point.
Smoke Generation Silicone polymers yield low levels of smoke under normal service or fire conditions.
Radiation Resistance At room temperature, silicone elastomers outperform TFE resin and conventional fluoroelastomers on exposure to 10/8 roentgens.

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