Specification Grade Silicones

AMS3345 Silicone

AMS3345 silicone meets an AMS standard for a high-strength, methyl phenyl vinyl silicone (PVMQ) rubber used in low-temperature and aircraft piston engine oil environments. It specifies a 50 durometer (45-55 range) hardness and provides properties for the material in forms like sheet, strip, tubing, and molded shapes. This material is able to remain flexible across a wide temperature range, from -130°F to 401°F (-90°C to 205°C).

AMS3345 Silicone Properties

Key characteristics include:

  • Material Type: Methyl Phenyl Vinyl Silicone (PVMQ).
  • Hardness: 50 durometer, with a range of 45-55 durometer shore A.
  • Temperature Resistance: Remains flexible and functional from -130°F to 401°F (-90°C to 205°C).
  • Specialized Resistance: Specifically designed to resist weathering and the oils found in aircraft piston engines.
  • High Strength: Features high tensile strength, tear resistance, and elongation for use in demanding applications.
  • Forms: Covers silicone in the form of sheet, strip, tubing, molded shapes, and extrusions.

AMS3345 Silicone FAQs

What is AMS3345 silicone?

AMS3345 silicone is a methyl phenyl vinyl silicone (PVMQ) elastomer designed for very low‑temperature performance and resistance to aircraft piston engine oils. It is used in aerospace applications requiring flexibility, tear resistance, and durability in extreme environments.

What durometer does AMS3345 specify?

AMS3345 requires a 50 durometer silicone with an allowable hardness range of 45–55 Shore A, ensuring consistent sealing performance across aerospace components.

What is the temperature range of AMS3345 silicone?

AMS3345 silicone remains flexible and functional from −130°F to +401°F (−90°C to +205°C), making it suitable for extreme cold and elevated‑temperature aerospace environments.

What forms does AMS3345 silicone come in?

The full specification covers silicone supplied as:

  • Sheet
  • Strip
  • Tubing
  • Molded shapes
  • Extrusions

These forms support seals, gaskets, O‑rings, and molded‑in‑place components.

Note: ElastaPro supplies solid sheets and uncured compounds.

What makes AMS3345 silicone different from standard silicone?

This aerospace grade  silicone is engineered for:

  • Very low‑temperature flexibility (down to −130°F)
  • Resistance to aircraft piston engine oils
  • High strength and tear resistance
  • Aerospace‑grade consistency and testing requirements

These properties exceed those of general‑purpose silicone materials.

What applications commonly use AMS3345 silicone?

Typical uses include:

  • Aircraft piston engine oil seals
  • Low‑temperature aerospace gaskets
  • O‑rings and compression seals
  • Molded aerospace components
  • High‑strength, tear‑resistant sealing elements

These applications rely on the material’s PVMQ chemistry and extreme‑temperature performance.

Is AMS3345 silicone considered a high‑strength material?

Yes. AMS3345 specifies a high‑strength, tear‑resistant silicone formulation suitable for demanding aerospace environments where mechanical durability is critical.

Does AMS3345 silicone resist aircraft oils?

Yes. One of the defining characteristics of AMS3345 silicone is its resistance to the oils used in aircraft piston engines, making it ideal for seals exposed to lubricants and harsh fluids.

Is AMS3345 an active aerospace specification?

Yes. AMS3345 is an active SAE Aerospace Material Specification, reaffirmed and revised through 2020, and remains in use for aerospace elastomer components.

Can AMS3345 silicone be used for molded or extruded parts?

Yes. The specification explicitly covers molded shapes, extrusions, tubing, sheet, and strip, making it suitable for a wide range of fabricated aerospace components.

Ask ElastaPro for AMS Silicones

ElastaPro makes AMS silicone in solid sheets and uncured compounds. Contact us for more information.