High SG thermoplastic rubber
High SG thermoplastic rubber
(OP)
Hi,
I have a client who is wanting us to mould parts in a Thermoplastic Rubber with an S.G. of 3.2 (and other parts with even higher SG's).
I have a compounder nearby who can compound the material for me, but he only has experience with Barium Sulphate that will give us an sg of about 3.
any suggestions as to what fillers are available that
1) have an sg of 5,6,10??? to give us the higher densities?
2) can be run through an extruder and injection moulding machine without damaging the machines?
3) Reasonable price and freely available?
Thanks.
I have a client who is wanting us to mould parts in a Thermoplastic Rubber with an S.G. of 3.2 (and other parts with even higher SG's).
I have a compounder nearby who can compound the material for me, but he only has experience with Barium Sulphate that will give us an sg of about 3.
any suggestions as to what fillers are available that
1) have an sg of 5,6,10??? to give us the higher densities?
2) can be run through an extruder and injection moulding machine without damaging the machines?
3) Reasonable price and freely available?
Thanks.





RE: High SG thermoplastic rubber
Alternatives are tungsten powder, iron powder, etc.
H
www.tynevalleyplastics.co.uk
It's ok to soar like an eagle, but weasels don't get sucked into jet engines.
RE: High SG thermoplastic rubber
RE: High SG thermoplastic rubber
It's not actually that abrasive - there are no "ends" as there are with glass fibre filled stuff.
There are millions of magnets moulded each year - there is a compounder in the UK who does nothing else but magnetic materials. Does very nicely I believe...
Tungsten powder filled nylon is used to make bullets for special forces (Indoor use. Go though bodies but not through walls).
H
www.tynevalleyplastics.co.uk
It's ok to soar like an eagle, but weasels don't get sucked into jet engines.
RE: High SG thermoplastic rubber
Bronze will certainly get the SG you want.
The more dense the filler the less you need so the less the impact on other properties.
Regards
Pat
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RE: High SG thermoplastic rubber
Also, be careful when shooting for a certain target density. 99/100 people get the calculation wrong. The density of the composite depends linearly on the volume % of each ingredient not the weight %.
Use this for example: http://www.netcomposites.com/calculators/volume-we...
Chris DeArmitt - PhD FRSC CChem
Plastic & Additives Webinars
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RE: High SG thermoplastic rubber
Chris DeArmitt - PhD FRSC CChem
Plastic & Additives Webinars
Instant Downloads & Inexpensive
www.plastictraining.com
RE: High SG thermoplastic rubber
I can't see how one could get such a high filler loading?
I need to find a filler with an sg of about 12.
RE: High SG thermoplastic rubber
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
http://eng-tips.com/market.cfm
for site rules
RE: High SG thermoplastic rubber
For 83 weight% Magnetite you have 50 volume % of filler and 50 of resin so that will work. See for yourself using that online calculator I linked to.
If you need higher density filler try iron (8 g/cm3) or tungsten (19 g/cm3).
Chris DeArmitt - PhD FRSC CChem
Plastic & Additives Webinars
Instant Downloads & Inexpensive
www.plastictraining.com