Specification Grade Silicones

Military Silicones and Fluorosilicones

Military silicones and fluorosilicones from ElastaPro meet U.S. military specifications (MIL-SPEC) and standards. We supply a full Certificate of Analysis (COA) with every batch and welcome your questions about the origins of our raw materials.

At ElastaPro, we believe that supply chain literacy and friendly nation sourcing are part of the job. That’s why we work closely with military buyers to help them understand not just what they’re specifying, but where it comes from and how secure that supply chain really is.

Whether you need solid or cellular sheets, continuous rolls, or uncured compound, ElastaPro manufacturers military silicones and fluorosilicones in Santa Fe Springs, California (USA) in accordance with our ISO 9001:2015 and AS99100D certified quality management system.

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What Makes It a Military Silicone or Fluorosilicone?

Military silicones (VMQ), phenyl silicones (PVMQ) and fluorosilicones (FVMQ) are formulated and manufactured to meet U.S. military specifications and standards for products such as:

  • Seals
  • Gaskets
  • O-rings
  • Electrical insulation
  • Vibration damping

The main difference between military silicones and fluorosilicones is that fluorosilicones offer greater resistance to fuel, oils, and other chemicals.  Fluorosilicones tend to be more expensive, but they’re required for some military applications.

Collectively, these high-performance materials are also called MIL-SPEC silicones. They meet military detail specifications (MIL-DTL) or military standards (MIL-STD) and may carry designations such as MIL-R for military rubber products.

Some military silicones and fluorosilicones meet other specs and standards. Examples include AMS silicones and AMSR25988 fluorosilicones. SAE International, a standards development organization, defines Aerospace Material Specifications (AMS) that the U.S. military uses.

Types of Military Silicones and Fluorosilicones

ElastaPro makes military silicones and fluorosilicones that meet these specifications.

  • A-A-59588 (ZZ-R-765)
  • AMS 3325 and AMS 3326
  • AMS 3327
  • AMS 3345
  • AMS 3357
  • AMS-R-25988 (MIL-DTL-25988)
  • ASTM D6576 (MIL-R-6130, MIL-R-46089)
  • MIL-STD-417 TA
  • MIL-STD-670 TE12
  • WS14644

The sections below provide brief descriptions with links to pages that contain additional information.

Note: Obsolete specs appear in parentheses but still appear on some older part drawings.

A-A-59588 (ZZ-R-765)

AMS-R-25988 fluorosilicones meet the requirements of an SAE International specification that supersedes MIL-DTL-25988 and is used by the U.S. military. ElastaPro makes Type 2, Class 1 materials in Grades 40, 50, 60, and 70.

AMS 3325 and AMS 3326

AMS 3325 fluorosilicone is resistant to fuel and oils and available in a hardness of 55-65 durometer (Shore A). AMS 3326 was superseded by AMS3325, and its requirements are now part of this newer standard.

AMS 3327

AMS 3327 fluorosilicone is designed for high-temperature applications in fuel systems and lubricants. It offers excellent resistance to fuels and oils. AMS 3327 fluorosilicone is available in a 70-80 durometer (Shore A).

AMS 3345

AMS 3345 silicone is a high-strength, methyl phenyl vinyl silicone (PVMQ) used in low-temperature and aircraft piston engine oil environments. It specifies a Shore A hardness of 50 durometer (45 to 55 range).

AMS 3357

AMS 3357 silicone meets an AMS standard for a silicone rubber (VMQ) that is designed to be resistant to aircraft piston engine lubricating oils. It has good compression set resistance and a durometer range of 65-75 (Shore A).

AMS-R-25988 (MIL-DTL-25988)

AMS-R-25988 fluorosilicone meets the requirements of an SAE International specification that supersedes MIL-DTL-25988 and is used by the U.S. military. ElastaPro makes Type 2, Class 1 materials in Grades 40, 50, 60, and 70.

ASTM D6576 (MIL-R-6130, MIL-R-46089)

ASTM D6576 is an ASTM International specification for flexible cellular rubber that is chemically blown. It replaces the two obsolete military specifications: MIL-R-6130 and MIL-R-46089. ASTM D6576 covers closed-cell medium-density silicone sponge sheet, which ElastaPro provides.

MIL-STD-417 TA

MIL-STD-417 TA silicone meets the requirements of a U.S. military standard for solid elastomer materials. The “TA” designation refers to silicones and is followed by a three-digit number. ElastaPro makes MIL-STD-417 TA silicones that range from TA 405 to TA810.

MIL-STD-670 TE12

MIL-STD-670 TE12 silicone foam meets the requirements of a U.S. military standard for a closed-cell medium-density silicone foam for seals and gaskets. The TE12 designation indicates a specific firmness and density within the larger standard.

WS14644

WS14655 silicone meets the requirements of a U.S. Navy specification for electrically conductive silicone rubber compounds. ElastaPro makes Type III high conductivity, carbon black filled materials. Applications include EMI gaskets, anti-static components, and conductive pads and seals.

Additional Resources

See these pages for information about dimensions, durometers, colors, and added-value services such as roll slitting and pressure-sensitive adhesive (PSA) lamination.

Contact ElastaPro for military silicones and fluorosilicones you can count on.