Thermoplastic components from SLS nylon or silicone rubber moulds

From: Simon van de Crommert (
Date: Tue Dec 09 1997 - 18:00:47 EET


This paper (presented at RP&M Conference, Detroit 1996) was more or less a
feasibility study for plastic injection moulding into:
a) SLS nylon moulds
b) Silicone rubber moulds

Both approaches performed very well, DTM is currently heavily evaluating the
nylon mould approach and Dr. Venus has successfully investigated the silicone
rubber mould approach further. Anybody interested in the 1996 paper can
contact me, and I will E-mail the text.

Unfortunately/or fortunately both authors of the 1996 paper have moved on:
Antony Venus University of Cambridge (UK)
Simon van de Crommert Sales and Applications Representative for DTM

Simon van de Crommert
- Sales and Applications Representative UK & Benelux -
9 Poplar Road
B93 8DD

Tel.: +44 (0)1564 778128
Fax: +44 (0)1564 774128
E-mail :

From: on behalf of John Male
Sent: 09 December 1997 10:38
Subject: Re: Thermoplastic components from silicone tooling


Anthony Venus published a paper on this subject at the 2nd National
Conference on Developments in Rapid Prototyping and Tooling.
He injected LDPE, 30% glass filled PP and polyamide into a metal filled
silicone rubber tool.
He says that he injected 30 parts at injection temperatures ranging from
200 celsius for the LDPE to 310 for the PA. The parts "suffered from
excessive flash and thickening due to the injection pressure". The
injection pressure is quoted as 25MPa and a clamping pressure of 10MPa.
The silicone rubber was cast into a steel bolster. Cycle times were 8 to
10 minutes.
The silicone rubber that he used was MCP KE1300T, and filled with an
unspecified metal powder at weights from 109 to 168%.
This paper was published about a year ago, and was I believe only the
start of a study, so it may be worth contacting him directly. His email
address is and their web page is
Just out of interest, have you tried direct aim?


John Male
Research Student
Centre for Rapid Design and Manufacture
Buckinghamshire College

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