Custom Elastomer Compounding, C&M Rubber, Dayton, OH

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	Custom Elastomer Compounding

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C&M Rubber Co. has a longstanding business relationship with many polymer suppliers, including Momentive (Formerly GE Silicone), Wacker Silicone, and Dow Corning… We have in-house capability to mix a silicone compound for your specific application. We can color match to the Pantone© Formula Guide and produce a custom compound with the durometer (hardness) granularity of ±5 points. C&M Rubber Co. has a wide breadth of knowledge in developing compounds that can tolerate a wide range of temperatures, 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.

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

Compounding Equipment · Commonly Available Elastomer Materials · General Silicone Characteristics

Compounding Equipment

Mills		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 600ºF. Even under extreme heat, these compounds provide superior tensile strength, elongation and abrasion resistance.

Low Temperature

Despite extreme temperatures as low as -100ºF, most silicone elastomers retain durometer and modulus. Special grades have brittle points below -150*F and remain serviceable at temperatures as low as -130ºF.

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.

MORE IMAGES


	· Mill Machine

	· Mill Room

	· Durometer

	· Measured Silicone Portioning

	· Raw Silicone

DOWNLOADS


		Durometer (PDF, 177KB)

		Elastomer Compatibility Chart (PDF, 290KB)

		Elastomer Library (PDF, 383KB)

		Glossary of Elastomeric Terms (PDF, 346KB)

		Rubber Shelf Life (PDF, 214KB)

Custom Elastomer Compounding

Mills

Preform Extruders

Lab Press

Silicone

Flourosilicone

Neoprene, NBR, EPDM, Millable Urethane & Nitrile