Hello all,
Ive been using CC10/50 for about a year now and recently been experiencing small micro bubbles appearing in my pours. CC 10/50 1kg pack has been laying for some time and developed crystallizing at the bottom.
Ive put it in hot water and let it cool naturally and got it back to a nice clear consistency.  
Mixing approx 90g in 2:1 ratio
Mixing in small plastic cups for 3mins then pour in to second cup with further 1 min mix.
poured in to 3rd cup slowly at a depth of 35mm
used heat gun to pop top bubbles
left to cure over night
any help would be greatly received, thanks

in the morning i can see tiny bubbles thru the entire 35mm depth of the pour

Hi John, Can I just check; is this GlassCast (You've put Clear Cast) so want to ensure we're talking about the same product; if so, the mix ratio when mixing by weight is 100:45 rather than 2:1, the latter is the ratio when measuring by volume; its worth checking as getting it the wrong way round can give some curing issues.

What temperatures are you working in and what temperature is the resin when you're mixing it? At lower temps, the viscosity increases quite significantly and when it is thicker, it struggles to release air as easily; to avoid this, ensure that both your environment and the resin itself is at least 20'C as this should ensure it naturally degasses without a problem.

+x

 

Rich (Staff) - 1/10/2019 5:53:43 PM

Hi John, Can I just check; is this GlassCast (You've put Clear Cast) so want to ensure we're talking about the same product; if so, the mix ratio when mixing by weight is 100:45 rather than 2:1, the latter is the ratio when measuring by volume; its worth checking as getting it the wrong way round can give some curing issues.

What temperatures are you working in and what temperature is the resin when you're mixing it? At lower temps, the viscosity increases quite significantly and when it is thicker, it struggles to release air as easily; to avoid this, ensure that both your environment and the resin itself is at least 20'C as this should ensure it naturally degasses without a problem.

Update**  Taking the above advice, I slowly heated parts A+B to around 25 Degree C and maintained this room temp for the pour and set. This time correctly measuring weight ratio @ 100:45. Mixed for 3 mins and then poured in to another container and further mixed for 1min then poured in to 3rd container to set. Took heat gun periodically to top to release bubbles over the next hour. The results where again disappointing, less bubbles.I compared this with a double pour I did 1 year ago with the same batch and this has just 3 tiny bubbles, (sorry for the scratches, this was a test piece that has been in my workshop since the pour)

 
Images below are poured 1 year ago, 5 times the amount of resin and virtually no bubbles.