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Accelerating blooming in EPDM material

kathlesami (Materials) (OP)
15 May 07 11:35
Hi,

does anyone know if there is any way to accelerate blooming in a EPDM formulation with peroxide curing?  

thanks
berti (Chemical)
20 May 07 11:51
Hi kathlesami,

???, sorry for question marks.

What are you looking for ? "Blooming" means imho an unwanted sadlayer of decomposition products on the surface of a part, in case of EPDM e.g. of dithiocarbamate accelerators.

Pse clear the point.

Regards

Berti
Qesam (Materials)
14 Jun 07 6:14
Hello Kathlesami,

You can try this:
immerse you test specimen into a beaker with water (cover the specimen), and put it in an 70C oven and have observation every six hours. [Remember to refill the water for every few hours)

That's for Accelerating blooming.

Hope it can help.
GrahamBennett (Materials)
14 Jun 07 11:25
I agree with berti.  Please clarify your post kathlesami.
tom1953 (Chemical)
19 Jun 07 8:48
Bloom is generally a solubility issue, and solubility generally decreases as the temperature decreases. So, you should be able to accelerate the blooming by lowering the temperature. Of course, the bloom may redissolve in the rubber when the rubber warms back up.
tom
edine (Materials)
3 Oct 07 10:04
Hanging parts in a warm humid spot sometimes accelerates blooming.

I am surprised you have a problem with peroxide cured material. Blooming in peroxide cures is seldom a curative by-product unless there is something leftover from a switch from sulfur to peroxide. Other materials like wax, antioxidants and process aids will bloom. Sometimes you can scrap or disolve the material off the surface and identify it. Your compounder should be able to help you with this issue.

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