It's more of a stress relaxation problem than a creep one. Creep occurs when a material is subjected to constant load and continuously deforms over time.
Stress relaxation occurs when a material is subjected to an applied fixed deformation, the initial stress set up decays over time.
When...
COC (Cyclic Olefinic Copolymer) materials can reach 93% (ASTM D1003). They can be sensitive to skin oils though, but would be fine if the part is on the interior of the lamp and not handled during use.
Regards Bryan Deacon
Ticona UK Limited
www.ticona.com
I agree with insideman, you have to be very careful designing polymer spring especially where either a fixed deformation is placed on the spring (the spring load reduces over time due to stress relaxation) or a permanent load (spring deflection increases over time due creep).
However if the...
If its any help, the worlds largest manufacturer (according to their web site) of Roll-on balls is Euro-Matic , check out http://www.euro-matic.com/rollon.html
Regards Bryan Deacon
Ticona UK Limited
www.ticona.com
The Celcon grade mentioned above is certainly a possibilty. Celcon is manufactured by Ticona (who I work for) and is know variously as Celcon (Americas) , Hostaform (Europe) and Duracon (Far East). We offer a range of POM products with Carbon Fibre and Conductive Carbon.
Another option is to...
