AS40 silicone vacuum degassing

Talk Composites - The Forum for Advanced Composites

Back

AS40 silicone vacuum degassing

Author	Message
dubster	dubster posted 4 Years Ago HOT Topic Details
Group: Forum Members Posts: 15, Visits: 126	I would like to degass the AS40 silicone. it is the first time I use this Easycomp material. I am using a VE115SV 1/4HP pump. It seems that the silicone isn't degassing completely. could it be that the pump has to less power to degass? the silicone starts to bublle, but doesn't make the self collapse. pix of a sample i made and the finished result
	Reply Like 3
Warren (Staff)	Warren (Staff) posted 4 Years Ago HOT Post Details
Group: Administrators Posts: 2.5K, Visits: 7.9K	I would fit a gauge to your system so you know the exact vacuum being pulled. Without full vacuum, usually its tough to degas silicones and thicker resins as the froth does not collapse on its own and even letting air in to force it collapse and re-pulling the vacuum isn't always that successful either. Warren Penalver Easy Composites / Carbon Mods - Technical Support Assistant
	Reply Like 3
dubster	dubster posted 4 Years Ago HOT Post Details
Group: Forum Members Posts: 15, Visits: 126	It now makes the selve collapse, but it takes ages to degass it completely. in this times where materials aren't easy to receive, Is it a shame to use a first silicone (that degasses much faster) for casting on the visual side, let it cure and then use a second one 'to fill the space'? both silicones have the same shore value...
	Reply Like 4
Hanaldo	Hanaldo posted 4 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	+x dubster - 4/20/2020 9:27:56 AM It now makes the selve collapse, but it takes ages to degass it completely. in this times where materials aren't easy to receive, Is it a shame to use a first silicone (that degasses much faster) for casting on the visual side, let it cure and then use a second one 'to fill the space'? both silicones have the same shore value... Shouldn't be an issue if you get the timing right and pour the second batch of silicone when the first pour is still tacky. But this will always be a touch weaker than a single pour. Depends how many times you want to use the mould as to whether that will matter or not.
	Reply Like 3
dubster	dubster posted 4 Years Ago HOT Post Details
Group: Forum Members Posts: 15, Visits: 126	+x Hanaldo - 4/21/2020 5:51:45 AM +x dubster - 4/20/2020 9:27:56 AM It now makes the selve collapse, but it takes ages to degass it completely. in this times where materials aren't easy to receive, Is it a shame to use a first silicone (that degasses much faster) for casting on the visual side, let it cure and then use a second one 'to fill the space'? both silicones have the same shore value... Shouldn't be an issue if you get the timing right and pour the second batch of silicone when the first pour is still tacky. But this will always be a touch weaker than a single pour. Depends how many times you want to use the mould as to whether that will matter or not. Thanks for the advice!!
	Reply Like 3