Liquid rubber polyurethanes - General Discussion

Hi there,

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For a while now I have been making parts to sell from PLA plastic via 3D printing.

What I really need, however, is a way to make these parts from a semi flexible, non-brittle rubber/silicone.

I have found items such as:
MB Fibreglass

Polytek Poly PT Flex 70 Liquid Casting Rubber

MB Fibreglass of Northern Ireland (Mcconnell Bro's)- Supplying throughout the UK & Ireland

and it looks like it could be suitable (I could make or 3D print a mould so that&#;s not an issue)

However, what&#;s complicating matters for me are the warnings that these liquid polyurethane rubbers can irritate skin. My part would be worn touching the skin for long periods of time (consecutive days etc, maybe up to a week or even every day constantly) without much of a break. Due to this, I need to be sure that the product isn&#;t going to cause a negative reaction for someone who uses the product.

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From what I have read, it seems that these polyurethane rubber warnings are more to do with the stage before it has been mixed and has had chance to set. It&#;s not an issue for me if it is irritating to skin during this stage&#;but how about after it has set? Does anyone know if skin irritation due to the chemical make-up of the rubber is possible? If so, how likely?

I appreciate that these are not easy questions to answer and I am not looking for any legal guarantee&#;just the opinion of someone who has done something similar and observed the results!

Any answers or help would be greatly appreciated!

Best wishes,

Dan.

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