Rubber blooming on end product
Rubber blooming on end product
(OP)
I'm trying to understand the nature of blooming that appear on our products but cannot really understand these I got from internet:
1. Is the color change light induced? (mask part of sample for reference)
Grey/Brown - amine antioxidant
Pink - phenolic antioxidant
2. Is the color change heat induced?
If yes with stickiness/embrittlement - oxidative degradation
If yes without stickiness/embrittlement - amine antioxidant
What does light induced and heat induced mean?
Do I know to apply light/heat on products?
Thanks in advance.
1. Is the color change light induced? (mask part of sample for reference)
Grey/Brown - amine antioxidant
Pink - phenolic antioxidant
2. Is the color change heat induced?
If yes with stickiness/embrittlement - oxidative degradation
If yes without stickiness/embrittlement - amine antioxidant
What does light induced and heat induced mean?
Do I know to apply light/heat on products?
Thanks in advance.





RE: Rubber blooming on end product
"Heat induced" means exposing the rubber part to heat.
Many cases of blooming are due to an excess of sulfur in the formulation, however. This appears as a white discolouration that can be easily removed with a solvent wipe but will recur over a relatively short space of time.
forumtowers.com
RE: Rubber blooming on end product
But could sulphur less than 1.5phr also "helps" in case of blooming.
Yes, as said... it blooms, and we washed with silicon and water and then when it reaches our oversea customer (after some time)...it blooms again..
RE: Rubber blooming on end product
To help you to eradicate the bloom altogether I would need to see your formulation but I suspect you will not be able or willing to divulge this on an open forum.
forumtowers.com