TOMPS Value BUDGET Economy RTV Silicone Rubber A25 . The New MEDIUM Hardness! We now offer this in 4 grades, the one you may have previously bought is now the "Soft" 20 Shore A Version. However if you would like something harder or softer, check out the other 3 items in this category.
Another of the cheapest silicone kits in the UK without big sacrifice on quality. Our new offering to the market, ideally suited to short runs and quick prototypes where dimensions are not the most important. Shrinks no more than 0.4%, so in small scales this is nearly zero. A 25 Shore A hardness RTV Silicone Rubber with a good catalysed viscosity for easier air release.
This RTV has an open potlife of around 40 minutes for the slow set and 7-10 for the fast set (depending on temperature and humidity!). More technical data is to follow - we are currently writing the MSDS and TDS sheets!
Catalyst addition is 3% or 30g per kilo. With the fast catalyst, addition can be reduced to 2% or 20g a kilo to extend pot life. Do NOT reduce catalyst addition on the slow catalyst.
This is the second generation system offered by TOMPS with a modified catalyst. Not only has this improved shrinkage, it has also dealt with any oil bleed issues that very few customers have reported over the last year. However, we were not happy with 1 in 100 issues and have endeavoured to make it a 0 in 100 issues!
Catalyst is now a low toxicity system and is now GHS labelled.