All products and parts used in the aerospace industry have to be proven safe through rigorous testing and high production standards. Aerospace parts from small fasteners to wire insulations to fluid gaskets must stand up to demanding operating conditions for extended periods of time.
Teflon™ coatings used in the aerospace industry are highly specified, highly qualified, and resistant to a wide range of stresses. They offer durability and toughness for an industry with unique needs. Here we’ll review Teflon™ product lines commonly used in aerospace as well as pertinent SAE standards and aerospace standards resources.
Teflon™ for Aerospace
The combination of many Teflon™ coating properties make these coatings particularly robust for aerospace. Teflon™ PTFE and FEP coating systems are among the most popular in the industry.
PTFE 851G-2XX and 852G-2XX are ideal systems for aerospace applications requiring thermal stability and superior coefficient of friction. The acid primers 850G-204 and 850G-314 offer high lubricity in a thin film. Acid primers are usually used under a PTFE Topcoat, but the acid primer alone is useful in some applications such as fuel filter screens.
FEP One Coats (954G-3XX and 959G-2XX) are also well-suited for aerospace because of their durability and high service temperatures of up to 425° F. And the FEP system of 953G-506 (primer) and 953G-401 topcoat provides premium release properties with good chemical resistance. Toilet bowls on airplanes are often coated with this FEP system so the toilets use less water, planes carry less water, and planes use less fuel.
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Common SAE Standards:
- AMS2515H PTFE Resin Coating, Low Build, 370 to 400 °C (698 to 752 °F) Fusion – This specification establishes the engineering requirements for producing thin coatings of PTFE (with acid primer) on parts and the properties of such coatings.
- AS 9100D Quality Management Systems - Requirements for Aviation, Space, and Defense Organizations – This standard includes ISO 9001:2015 quality management system requirements and specifies additional aviation, space, and defense industry requirements, definitions, and notes.
- AS12500 Corrosion Prevention and Deterioration Control in Electronic Components and Assemblies – This specification covers corrosion prevention and mitigation aspects in Avionics, Electronics, and Electrical Wire Interconnect Systems. (Replaced MIL-HDBK-1250.)
- AS7489 Standard Requirements for Aerospace Organic Coatings Applicator Certification – This standard establishes the minimum requirements for training, examination, and certification of aerospace coatings application personnel applying liquid organic coatings to interior structural or exterior substrates.
Aerospace Coating Resources:
- Aerospace Industries Association–The National Aerospace Standards (NAS) are voluntary standards developed by the aerospace industry.
- Aerospace Standards Overview by ASTM – Compiled by a number of ASTM International committees covering aircraft construction and parts manufacturing.
- The Gardner-Sward Handbook – This “Paint and Coating Testing Manual” is a valuable guide to standards of many national and international organizations.
- IAQG-OASIS Database – The Online Aerospace Supplier Information System (IAQG-OASIS) is a reliable source for aerospace supplier certification and registration data.
- Nadcap – Nadcap is the leading worldwide cooperative program of major companies designed to manage a cost-effective consensus approach to special processes and products and provide continual improvement within the aerospace and defense industries. And here’s an FAQ Page on Nadcap Accreditation by Boeing.
One common manufacturer’s specification not listed is the Boeing BMS10-146 material specification, which outlines application and performance requirements of Teflon™ 958G-203 One-Coat. This is not a public standard, but one you should be aware of nonetheless.