High strength silicone mould making rubber. Our silicone has been formulated for easy mixing by hand, with colour coded components (red or green) giving a visual aid to ensure mixing is adequate. The two components mix easily and because of the low viscosity most grades can be used without processing in a vacuum chamber. This silicone is suited for the detailed reproduction of figures, art objects and similar items.
Features :
Outstanding Release Properties
Medium Hardness
High Tear Resistance
High elasticity for easy removal of complex replica parts
Can be made thixotropic (non flowable) for vertical surface replication
- Red catalyst is by far the most popular catalyst to use with the GP-3481-F silicone, it gives great air release with longer working and demould times.
- Clear catalyst is used when pigments are required, when mixing pigments into a white silicone base it can result in lighter shades of the colour intended. e.g. black pigment will become grey / dark grey.
- Green catalyst is used when time is off importance, it will cure a lot quicker roughly in half the time, but this will not give as good of air release as the red fast set catalyst.
NOTE - When using clear catalyst, best to double mix the silicone and catalyst because it is very hard to see if the catalyst has fully mixed through, so a double mix is advised.
| | Red Fast Catalyst | Clear Fast Catalyst | Green Very Fast Catalyst |
| Mix Ratio | 10 : 1 | 10 : 1 | 10 : 1 |
| Working Time | 40 - 60 Minutes | 40 - 60 Minutes | 20 - 30 Minutes |
| Curing Times | 6 - 8 Hours @ 25° | 6 - 8 Hours @ 25° | 2 - 4 Hours @ 25° |
| Cured Colour | Light Pink | White | Light Green |
| De-Mould Time | 12 - 24 Hours | 12 - 24 Hours | 6 - 8 Hours |
| Mixed Viscosity mPas | 18000 | 18000 | 18000 |
| Hardness Shore A | 27 | 27 | 27 |
| Tensile Strength Mpa | 3.0 | 3.0 | 3.0 |
| Elongation @ Break % | 520 | 520 | 520 |
| Tear Strength kN/m | 23 | 23 | 23 |
| Linear Shrinkage | 0.2-0.5 | 0.2-0.5 | 0.2-0.5 |
- Not suitable for food use
- Not suitable for direct use on skin
Base and catalyst use universal containers for various kit sizes and are supplied by weight, while the supplied containers may not be full, they will contain the correct amount of both base and hardener according to the listing. At point of packaging and dispatch lids may be taped to prevent damage or spillage during transportation.
Polycraft GP-3481F Silicone Moulding
Polycraft GP-3481F Silicone Moulding Without Vacuum Chamber
Very Easy to Use and Performed Flawlessly 09 November 2024 | Steve
First time I tried GP3481-F (Red Catalyst) and it did not disappoint. I have used the twice more expensive well known brand from the US, but this silicone is miles better. It arrived from MBFG very quickly and the service from MBFG was excellent. I now have a new supplier and will be using this company from now on. Great service, Great product. What's not to like? Thanks guys...
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Perfect for making moulds of ceiling details 10 December 2019 | Paul
This is the real deal. I'm a novice, and have been using it to create moulds of ornate Victorian papier mache cornice and other ceiling details to replace damp-damaged areas. I've just completed one large cornice section that's over a metre long. I don't have a vacuum chamber, so I followed MBFG's advice of painting the first layer on, then pouring the rest into the mould box. I can't believe how well the moulds have turned out - no bubbles at all, and no reaction with the various paints on the original cornice - unlike latex, which reacted badly to some gold paint. I was able to take a good section of the original cornice from the ceiling and build a mould box on the bench, but I understand that there's a thickener additive available that would allow you to do it in situ.
The container has some excellent instructions on it, but MBFB also has some great documents and videos - I'd recommend studying them first - but if you follow the directions carefully, you'll get excellent results like mine. I'd also recommend looking at some of the ancillaries - the plastic stirring sticks and breakout bowls were particularly useful.
55 of 55 people found this review helpful.
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23 October 2018 | Marcus
I used to use a very well known product until I tried this.i is just as good with no bubbles and it's actually half the price per kilo than what I used to use , fantastic stuff!!
5 of 5 people found this review helpful.
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15 March 2018 | Alan
I had a go at mouldy making for the first time with this kit. It was very easy to use and really pleased to find out the harder and silicon were packaged in the correct weights for mixing. I also found, when I made a call to the company, a very helpful chap on the line, he gave some solid advice and some hints and tips. Great service, great product.👍👌
20 of 45 people found this review helpful.
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27 October 2017 | Christopher
Dont look any furthur polly craft moulding and casting resins are second too none i have tried dozens of products over the years and these are far superior highly recommend
12 of 38 people found this review helpful.
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12 June 2017 | Keith
This is now my 'go to' silicone, the potlife with the red catalyst gives me plenty of time to set it up and pour my molds. The 27 shore ensures a good medium hardness that is strong enough for most projects and forgiving enough to allow easy removal of the pattern part. Highly recommended.
11 of 29 people found this review helpful.
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08 April 2014 | Darrell
My project would've been sunk without this product. Took a little trial and error as I needed to make a mould of part of a cornice on the ceiling but once I got the technique right the mould was spot on. Very versatile, simple 10:1 ratio makes it easy to mix and sets well.
29 of 61 people found this review helpful.
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Easy to use and gives great detail 15 March 2014 | Fiona
Coloured hardener makes it easy to check you have mixed thoroughly.
27 of 35 people found this review helpful.
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04 December 2013 | Paul
fast service,i placed my second order now.and have found the silicone very easy to use.site very user friendly and data sheets and info sheets helpful
8 of 28 people found this review helpful.
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22 September 2013 | Joanna
I think the best silicone mould making rubber I had. Fast curing, very strong and ideal for brush on moulds when mixed with thixo. Wont change for any other silicone. Highly recommended.
34 of 48 people found this review helpful.
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