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CUSTOM MOLDED RUBBER

Custom molded silicone and rubber made to your exact specifications.

Product Overview

Instead of trying to make a standard molded rubber part fit, why not create a custom molded rubber product that perfectly conforms to your application design requirements? We specialize in custom molded silicone and custom molded rubber parts made in the USA and China. Our team is ready to help take your project from idea to ignition here in the States or Overseas!

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Key Benefits

Custom Molded Parts Made in China and the USA

USA Parts Made Under an AS9100 Quality System

Prototype to Mass Production

Small Parts as Well as Larger or More Complex Shapes

ITAR Certified Manufacturing in the USA

Custom Molded Rubber PRODUCT OFFERINGS

WesLastomer™ Silicone Molding Compounds - Domestic

WesLastomer™ Silicone Molding Compounds - Domestic are a select group of silicone compounds typically reserved for high performance applications. Custom molded silicone parts made from these compounds are molded in the USA within the guidelines of our AS9100 quality system.

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WesLastomer™ Rubber Molding Compounds - Overseas

Our wide selection of economical overseas compounds include Commercial Silicone, High Tear Strength Silicone, Peroxide Cured EPDM, Neoprene, Nitrile, SBR and TPE. The rubber molding compounds are available from 40-70 durometer.

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A-A-59588, Class 3B Silicone

Custom molded parts made with a certified A-A-59588 Class 3B Silicone. In some industries, strong flex-fatigue resistance is mission critical. That’s why flex testing is an essential tool for ensuring aerospace and military silicones can meet the A-A-59588 3B specification from the U.S. General Services Administration (GSA).

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WESLASTOMER™ SILICONE MOLDING COMPOUNDS - DOMESTIC Reference Guide

Compound Number
Type of Rubber
Durometer (Shore A)
Temperature Range (F)
Specific Gravity (g/cc)
Tensile Strength (psi)
Elongation (%)
Tear (PPI Die "B")
Datasheet
Compound Number: RC350-0650
Type of Rubber: Silicone
Durometer (Shore A): 40
Temperature Range (F): -80 to +450
Specific Gravity (g/cc): 1.25
Tensile Strength (psi): 600
Elongation (%): 400
Tear (PPI Die "B"): 80
Compound Number: RC350-0651
Type of Rubber: Silicone
Durometer (Shore A): 50
Temperature Range (F): -80 to +450
Specific Gravity (g/cc): 1.45
Tensile Strength (psi): 600
Elongation (%): 300
Tear (PPI Die "B"): 80
Compound Number: RC350-0652
Type of Rubber: Silicone
Durometer (Shore A): 60
Temperature Range (F): -80 to +450
Specific Gravity (g/cc): 1.45
Tensile Strength (psi): 600
Elongation (%): 300
Tear (PPI Die "B"): 80
Compound Number: RC350-0653
Type of Rubber: Silicone
Durometer (Shore A): 70
Temperature Range (F): -80 to +450
Specific Gravity (g/cc): 1.5
Tensile Strength (psi): 650
Elongation (%): 275
Tear (PPI Die "B"): 80

WESLASTOMER™ RUBBER MOLDING COMPOUNDS - OVERSEAS Reference Guide

Compound Number
Type of Rubber
Durometer (Shore A)
Temperature Range (C)
Specific Gravity (g/cc)
Tensile Strength (Mpa)
Elongation (%)
Tear Strength (KN/m)
Datasheet
Compound Number: RC350-3100
Type of Rubber: High Tear Strength Silicone
Durometer (Shore A): 40
Temperature Range (C): -60 to +220
Specific Gravity (g/cc): 1.13
Tensile Strength (Mpa): 8
Elongation (%): 600
Tear Strength (KN/m): 35
Compound Number: RC350-3110
Type of Rubber: High Tear Strength Silicone
Durometer (Shore A): 50
Temperature Range (C): -60 to +220
Specific Gravity (g/cc): 1.15
Tensile Strength (Mpa): 8.5
Elongation (%): 550
Tear Strength (KN/m): 35
Compound Number: RC350-3120
Type of Rubber: High Tear Strength Silicone
Durometer (Shore A): 60
Temperature Range (C): -60 to +220
Specific Gravity (g/cc): 1.18
Tensile Strength (Mpa): 9
Elongation (%): 500
Tear Strength (KN/m): 40
Compound Number: RC350-3130
Type of Rubber: High Tear Strength Silicone
Durometer (Shore A): 70
Temperature Range (C): -60 to +220
Specific Gravity (g/cc): 1.20
Tensile Strength (Mpa): 8
Elongation (%): 400
Tear Strength (KN/m): 35
Compound Number: RC350-3200
Type of Rubber: Commercial Silicone
Durometer (Shore A): 40
Temperature Range (C): -60 to +220
Specific Gravity (g/cc): 1.13
Tensile Strength (Mpa): 6.5
Elongation (%): 400
Tear Strength (KN/m): 18
Compound Number: RC350-3210
Type of Rubber: Commercial Silicone
Durometer (Shore A): 50
Temperature Range (C): -60 to +220
Specific Gravity (g/cc): 1.15
Tensile Strength (Mpa): 7
Elongation (%): 330
Tear Strength (KN/m): 19
Compound Number: RC350-3220
Type of Rubber: Commercial Silicone
Durometer (Shore A): 60
Temperature Range (C): -60 to +220
Specific Gravity (g/cc): 1.19
Tensile Strength (Mpa): 7.5
Elongation (%): 270
Tear Strength (KN/m): 21
Compound Number: RC350-3230
Type of Rubber: Commercial Silicone
Durometer (Shore A): 70
Temperature Range (C): -60 to +220
Specific Gravity (g/cc): 1.20
Tensile Strength (Mpa): 6.5
Elongation (%): 210
Tear Strength (KN/m): 18
Compound Number: RC350-3300
Type of Rubber: Peroxide Cured EPDM
Durometer (Shore A): 40
Temperature Range (C): -55 to +150
Specific Gravity (g/cc): 1.11
Tensile Strength (Mpa): 5
Elongation (%): 600
Tear Strength (KN/m): 20
Compound Number: RC350-3310
Type of Rubber: Peroxide Cured EPDM
Durometer (Shore A): 50
Temperature Range (C): -55 to +150
Specific Gravity (g/cc): 1.12
Tensile Strength (Mpa): 8
Elongation (%): 550
Tear Strength (KN/m): 25
Compound Number: RC350-3220
Type of Rubber: Peroxide Cured EPDM
Durometer (Shore A): 60
Temperature Range (C): -55 to +150
Specific Gravity (g/cc): 1.14
Tensile Strength (Mpa): 10
Elongation (%): 450
Tear Strength (KN/m): 30
Compound Number: RC350-3330
Type of Rubber: Peroxide Cured EPDM
Durometer (Shore A): 70
Temperature Range (C): -55 to +150
Specific Gravity (g/cc): 1.17
Tensile Strength (Mpa): 10
Elongation (%): 350
Tear Strength (KN/m): 30
Compound Number: RC350-3400
Type of Rubber: Commercial EPDM
Durometer (Shore A): 40
Temperature Range (C): -50 to +130
Specific Gravity (g/cc): 1.11
Tensile Strength (Mpa): 5
Elongation (%): 550
Tear Strength (KN/m): 20
Compound Number: RC350-3410
Type of Rubber: Commercial EPDM
Durometer (Shore A): 50
Temperature Range (C): -50 to +130
Specific Gravity (g/cc): 1.17
Tensile Strength (Mpa): 8
Elongation (%): 450
Tear Strength (KN/m): 25
Compound Number: RC350-3420
Type of Rubber: Commercial EPDM
Durometer (Shore A): 60
Temperature Range (C): -50 to +130
Specific Gravity (g/cc): 1.22
Tensile Strength (Mpa): 10
Elongation (%): 350
Tear Strength (KN/m): 28
Compound Number: RC350-3430
Type of Rubber: Commercial EPDM
Durometer (Shore A): 70
Temperature Range (C): -50 to +130
Specific Gravity (g/cc): 1.23
Tensile Strength (Mpa): 10
Elongation (%): 280
Tear Strength (KN/m): 28
Compound Number: RC350-3500
Type of Rubber: Commercial Neoprene
Durometer (Shore A): 40
Temperature Range (C): -40 to +110
Specific Gravity (g/cc): 1.25
Tensile Strength (Mpa): 7
Elongation (%): 500
Tear Strength (KN/m): 22
Compound Number: RC350-3510
Type of Rubber: Commercial Neoprene
Durometer (Shore A): 50
Temperature Range (C): -40 to +110
Specific Gravity (g/cc): 1.30
Tensile Strength (Mpa): 10
Elongation (%): 400
Tear Strength (KN/m): 28
Compound Number: RC350-3520
Type of Rubber: Commercial Neoprene
Durometer (Shore A): 60
Temperature Range (C): -40 to +110
Specific Gravity (g/cc): 1.35
Tensile Strength (Mpa): 10
Elongation (%): 300
Tear Strength (KN/m): 30
Compound Number: RC350-3530
Type of Rubber: Commercial Neoprene
Durometer (Shore A): 70
Temperature Range (C): -40 to +110
Specific Gravity (g/cc): 1.37
Tensile Strength (Mpa): 10
Elongation (%): 280
Tear Strength (KN/m): 30
Compound Number: RC350-3600
Type of Rubber: Commercial Nitrile
Durometer (Shore A): 40
Temperature Range (C): -40 to +120
Specific Gravity (g/cc): 1.15
Tensile Strength (Mpa): 6
Elongation (%): 500
Tear Strength (KN/m): 20
Compound Number: RC350-3610
Type of Rubber: Commercial Nitrile
Durometer (Shore A): 50
Temperature Range (C): -40 to +120
Specific Gravity (g/cc): 1.23
Tensile Strength (Mpa): 8
Elongation (%): 400
Tear Strength (KN/m): 25
Compound Number: RC350-3620
Type of Rubber: Commercial Nitrile
Durometer (Shore A): 60
Temperature Range (C): -40 to +120
Specific Gravity (g/cc): 1.33
Tensile Strength (Mpa): 10
Elongation (%): 300
Tear Strength (KN/m): 28
Compound Number: RC350-3630
Type of Rubber: Commercial Nitrile
Durometer (Shore A): 70
Temperature Range (C): -40 to +120
Specific Gravity (g/cc): 1.33
Tensile Strength (Mpa): 10
Elongation (%): 280
Tear Strength (KN/m): 28
Compound Number: RC350-3700
Type of Rubber: Commercial SBR
Durometer (Shore A): 40
Temperature Range (C): -40 to +80
Specific Gravity (g/cc): 1.15
Tensile Strength (Mpa): 6
Elongation (%): 450
Tear Strength (KN/m): 18
Compound Number: RC350-3710
Type of Rubber: Commercial SBR
Durometer (Shore A): 50
Temperature Range (C): -40 to +80
Specific Gravity (g/cc): 1.20
Tensile Strength (Mpa): 8
Elongation (%): 400
Tear Strength (KN/m): 25
Compound Number: RC350-3720
Type of Rubber: Commercial SBR
Durometer (Shore A): 60
Temperature Range (C): -40 to +80
Specific Gravity (g/cc): 1.25
Tensile Strength (Mpa): 10
Elongation (%): 300
Tear Strength (KN/m): 28
Compound Number: RC350-3730
Type of Rubber: Commercial SBR
Durometer (Shore A): 70
Temperature Range (C): -40 to +80
Specific Gravity (g/cc): 1.30
Tensile Strength (Mpa): 10
Elongation (%): 280
Tear Strength (KN/m): 28
Compound Number: RC350-3800
Type of Rubber: High Grade TPE
Durometer (Shore A): 60
Temperature Range (C): -40 to +105
Specific Gravity (g/cc): 1.22
Tensile Strength (Mpa): 12
Elongation (%): 420
Tear Strength (KN/m): 41
Compound Number: RC350-3810
Type of Rubber: High Grade TPE
Durometer (Shore A): 70
Temperature Range (C): -40 to +105
Specific Gravity (g/cc): 1.25
Tensile Strength (Mpa): 14
Elongation (%): 360
Tear Strength (KN/m): 45
Compound Number: RC350-3900
Type of Rubber: Commercial TPE
Durometer (Shore A): 60
Temperature Range (C): -40 to +95
Specific Gravity (g/cc): .92
Tensile Strength (Mpa): 7
Elongation (%): 360
Tear Strength (KN/m): 38
Compound Number: RC350-3910
Type of Rubber: Commercial TPE
Durometer (Shore A): 70
Temperature Range (C): -40 to +95
Specific Gravity (g/cc): .95
Tensile Strength (Mpa): 7.8
Elongation (%): 320
Tear Strength (KN/m): 40

A-A-59588, CLASS 3B SILICONE Reference Guide

Compound Number
Color
Durometer
Low Temp Brittle Point @-70 C
Specific Gravity
Tensile Strength (psi)
Elongation (%)
Tear B (ppi)
Flex Resistance (140,000 cycles/inch)
Datasheet
Compound Number: RC350-0250
Color: Black
Durometer: 50
Low Temp Brittle Point @-70 C: Pass
Specific Gravity: 1.15
Tensile Strength (psi): 1280
Elongation (%): 660
Tear B (ppi): 240
Flex Resistance (140,000 cycles/inch): .42
Compound Number: RC350-0251
Color: Gray
Durometer: 50
Low Temp Brittle Point @-70 C: Pass
Specific Gravity: 1.15
Tensile Strength (psi): 1280
Elongation (%): 660
Tear B (ppi): 240
Flex Resistance (140,000 cycles/inch): .42
Compound Number: RC350-0252
Color: Red
Durometer: 50
Low Temp Brittle Point @-70 C: Pass
Specific Gravity: 1.15
Tensile Strength (psi): 1280
Elongation (%): 660
Tear B (ppi): 240
Flex Resistance (140,000 cycles/inch): .42
Compound Number: RC350-0260
Color: Black
Durometer: 60
Low Temp Brittle Point @-70 C: Pass
Specific Gravity: 1.19
Tensile Strength (psi): 1280
Elongation (%): 650
Tear B (ppi): 240
Flex Resistance (140,000 cycles/inch): .45
Compound Number: RC350-0261
Color: Gray
Durometer: 60
Low Temp Brittle Point @-70 C: Pass
Specific Gravity: 1.19
Tensile Strength (psi): 1280
Elongation (%): 650
Tear B (ppi): 240
Flex Resistance (140,000 cycles/inch): .45
Compound Number: RC350-0262
Color: Red
Durometer: 60
Low Temp Brittle Point @-70 C: Pass
Specific Gravity: 1.19
Tensile Strength (psi): 1280
Elongation (%): 650
Tear B (ppi): 240
Flex Resistance (140,000 cycles/inch): .45
Thomas Holscher
Hubbell
…Modus® should be included in any quote activity on new parts.

I appreciate everything Modus® did for Hubbell, when we had an emergency a couple of months ago - it is not forgotten. I have stressed to our engineers that Modus® should be included in any quote activity on new parts. Hence, you will continue to see more orders coming in from Hubbell this year and beyond. Thank you and I look forward to continued success of our great partnership.

Principle Product Engineer
Medtronic
Modus® deftly responded with creative solutions...

When our project encountered technical and supply-chain challenges, Modus® deftly responded with creative solutions that allowed us to produce superior performance parts for our medical device. Modus® collaborated with us every step of the way, going the extra mile to ensure that every technical requirement was met.

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