WHAT IS DELRIN

Delrin® bridges the gap between metals and ordinary plastics with a unique combination of strength, stiffness, hardness, dimensional stability, toughness, fatigue resistance, solvent and fuel resistance, abrasion resistance, low wear and low friction.

Delrin, is an engineering plastic, a polymer with the chemical formula -(-O-CH₂-)_n-. It is often marketed and used as a metal substitute. Delrin is a lightweight, low-friction, and wear-resistant thermoplastic with good physical and processing properties and capable of operating in temperatures in excess of 90 degrees Celsius (approximately 200 degrees Fahrenheit).

Anodized coatings have a much lower thermal conductivity and coefficient of linear expansion than aluminum. As a result, the coating will crack from thermal stress if exposed to temperatures above 80 °C.

Typical Properties Of Acetyl Copolymer, Delrin® & Aircraft-Grade (2011) Aluminum

Property	Test Method	Acetyl Copolymer	Delrin®	Anodized Aluminum
Mechanical Properties
Specific Gravity	ASTM D792	1.41	1.42	2.83
Density (lb/in³)	ASTM D792	0.0509	0.0515	0.102
Tensile Strength, Break (p.s.i.)	ASTM D638	9,800	10,000	7,600
Elongation At Break (%)	ASTM D638	75	75	22
Rockwell Hardness	ASTM D785	M80	M94	M60
Impact Strength 73°F Notched (ft-lbs/in)	ASTM D256	1.0	2.3	1.2
Flexural Strength (p.s.i.)	ASTM D790	13,000	14,300	10,500
Flexural Modulus (p.s.i.)	ASTM D790	370,000	420,000	340,000
Coefficient Of Friction (Dynamic)	40psi 50fpm	0.21	0.20	0.16

* Source - http://www.experimentalaircraft.info/articles/aircraft-building-8.php