I'm planning to make a silicone vacuumbag for infusion.

Hi Matthieu,

Colloidal silica would not be suitable to add to silicone to make it 'brushable' - instead you need a specific thixotropic additive for the type of silicone you're using. We actually have a thixotropic additive for our Addition Cure Silicone Rubber for this very purpose. We don't list the thixotropic additive on the website yet but we do have some and we could supply you with the small amount necessary. We also have an accelerator which makes the silicone cure within less than an hour; also helpful when you're making a re-usuable vacuum bag from brushable silicone. Lastly, we even have the stretchy net that we would recommend including within the silicone to significantly reduce the danger of tearing the bag.

In the near future we will be producing a silicone designed specifically for this purpose which will include the accelerator and the thixotropic additive already in the silicone. As you'd expect, we'll also be producing a tutorial series about this process.

In the meantime please get in touch if you'd like to pick up the various ingredients and give this a go.

All the best, Matt

Matt Statham
Easy Composites / Carbon Mods - Technical Sales