material to make eraser

[ppc3]

Hi , i'm looking to buy a material that pencil eraser is made of. I have injection molding application fot that material.I know that they are using pumice + other additives.I'm only worry about that blend of pumice will damage my screw and barrel.Is there anything that i can use with injection molding process to make final product that would work like a eraser??

 

[polym3]

Try this:

SMR L 100
White factice 100
Maglite D 30
Lithopone 100
Barytes 80
Whiting 150
Titanium dioxide 10
Light process oil 30
Zinc oxide 10
Stearic acid 2
Sulfur 6-8
MBTS 1-1.5
DPG 1-2