Polyamides Good in the Heat
One of the consequences of downsized, turbocharged engines is that there is a whole lot of heat being generated in the engine bay. So materials being used to produce components for under-the-hood applications need to exhibit both flame retardance and thermal stability.
Teknor Apex (teknorapex.com) has developed two new glass-filled nylon compounds for applications injection molded engine covers, Chemlon 904-13 GVNH and 204-13.
According to the company, a difference between these materials and others is that in order to achieve the same level of flame retardance, the conventional halogenated compounds through the use of high levels of flame retardant and synergistic filler materials. These materials make it more difficult to process and tend to yield poor surfaces. (If you look at the engine cover of a new vehicle, the quality of the surface finish is paramount.)
The new compounds are said to be 15 percent less dense than the conventional materials, yield a smooth surface and can be processed for parts with long flow paths or thin walls
Generally, when OEMs produce aluminum engine blocks (aluminum rather than cast iron because cast iron weighs like cast iron), they insert sleeves into the piston bores—cast iron sleeves.
I'm not talking about a plastic Revell model of a '57 Chevy, but a real vehicle, one that rolls off an assembly line in 1999 with another 99,999 just like it right behind. Is it possible, or is this just a fantasy of the marketing department at Elmer's?
A look at the 7 Series Carbon Core.