Talk Composites - The Forum for Advanced Composites

Mould reaction

http://www.talkcomposites.com/Topic36175.aspx

By Hansson43 - 4/9/2020 6:38:17 AM

Hi I recently made a mould from a front lip to a car in ABS-plastic and once I de-moulded it, it looked like the pictures. It's not that big of a deal I can fix it with some sandpaper. I just wonder though if you have any idea why this happened ? I found out afterwards that my Easylease went out of date by a a lot, could it be the easy lease being old ?
And the uni mould system I've use were also on the wrong side of the due date. But I tested the it befor application and it seemed alright.

 
By Hansson43 - 4/9/2020 12:48:23 PM

 
Hanaldo - 4/9/2020 10:04:01 AM
ABS is not easy to mould off. Not only does it deform at relatively low temperatures, but it is a bit vulnerable to styrene attack as well. Easylease or any other chemical release agent is not suitable, you really have to use PVA to protect the surface. And then either control the exotherm temperatures while the mould cures, or ensure the part is sufficiently supported so that it can't deform at all as the mould cures.

Thank you so much for your answer Hanaldo! You are the man, Happy Easter