Which Material Is Better for a Pneumatic Gun Bolt: Delrin 900sp or Ertalyte TX?

[Jynx18]

Looking for the major differences between these two materials.

The application is it is for a bolt in a pneumatic gun. The gun body is aluminum and the bolt will be made out of one of these materials. Fit between the two is fairly loose as in the bolt can be easily slid within the body. The bolt has orings which seal the air. operating conditions are nothing extreme. typical outdoor temperatures from 30 F to 110 F at the extremes. Bolt moves at high velocity and self lubrication is pretty important. Also resistance to chemicals, water absorption and swelling are important.

cost, ease of machining, etc are not important. I can have the bolt in either material for the same price. Just looking at which material is better.

Any input would be great. Thanks

 

[Navin A S]

!Delrin (Acetal) and Nylon 6/6 are both strong, lightweight materials that are often used in pneumatic guns. However, there are some major differences between the two. Delrin is a type of thermoplastic with good machinability, stiffness, creep resistance and fatigue endurance. It has excellent wear resistance and low friction characteristics, making it ideal for applications involving high-velocity movement. Delrin is also resistant to a variety of chemicals, including acids and alkalis, and has very low water absorption. Nylon 6/6 is another type of thermoplastic that is known for its toughness, strength and durability. It has excellent abrasion and chemical resistance, and its low coefficient of friction makes it ideal for bearing and bushing applications. Nylon 6/6 is not as stiff as Delrin, but it has better resistance to fatigue and is less prone to cracking or deformation. It also has higher water absorption compared to Delrin, so it may not be a good choice for applications where water exposure is an issue. Overall, Delrin may be the better choice for the application due to its superior wear resistance, low friction characteristics, and resistance to chemicals and water absorption.