Phenolic resin filler - barite
Phenolic resin filler - barite
(OP)
Does anyone know what the effect of using barite (BaSO4) as a filler in a phenolic resin is? Does it increase strength?
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Phenolic resin filler - barite
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RE: Phenolic resin filler - barite
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RE: Phenolic resin filler - barite
If we knew what you were trying to achieve with the filler, we could give better advice. Fillers and filled plastics is my top area of expertise. See my website for book recommendations to learn more about the topic.
Chris DeArmitt
www.phantomplastics.com
Consulting to the plastics industry
RE: Phenolic resin filler - barite
If they have a real project they may be well advised to call in a consultant that has specialised expertise in fillers.
Regards
Pat
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RE: Phenolic resin filler - barite
Lol. I'd welcome the work mate. It's not that easy building a consultancy business from scratch although I must admit it's going far better than I'd expected. I'm still hoping you and I can work out a project to do together just because it would be fun and I'd have an excuse to have some pints with you. Our daughter was born last week so I have plenty of extra work and sleepless nights to deal with! Pretty rewarding being a dad though.
Cheers,
Chris
Chris DeArmitt
www.phantomplastics.com
Consulting to the plastics industry
RE: Phenolic resin filler - barite
Good to hear.
At the moment I am finding it hard to get enough work to make ends meet and I would certainly like to find a project for both of us.
Congratulation on becoming a dad. Been there Done that 30 od years ago, but the memories still bring a smile.
Regards
Pat
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RE: Phenolic resin filler - barite
Basically, the (allegedly) phenolic component is a return manifold in a water cooler (heat exchanger). If you can envisage a rectangular plate with two rows of recessed holes, with this plate being the lid of a container made from similar material. Water enters one row of holes and leaves via the other row.
Operates at about 60C. The OEM component is supposed to have a life in excess of 150,000 hrs, but reverse engineered spares are not lasting more than 60,000 hrs before cracking around the holes (recess fillet radii) occured. Still trying to determine the cause - fatigue via vibration, ESC, shrinkage cracks (question - are delayed shrinkage cracks possible?).
Managed to get samples of OEM and RE components under the SEM - major filler component was silica, although the OEM appeared to have BaSO4 as well (still need to confirm this). Hence my query.
I've sent the samples for FTIR to see if they match, probably looking at performing some GCMS to better ID the materials.
Polymers aren't my field of expertise, but I figured I'll collect as much info as I can and see what I can do for myself without the hired help. I've left enough samples that if I do screw it up, there will be enough for a consultant to work on.
Anyway, would appreciate any tips - I'll post more results when I get them.
Thanks
ps congrats on the new born Chris.
RE: Phenolic resin filler - barite
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
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for site rules
RE: Phenolic resin filler - barite
RE: Phenolic resin filler - barite
http:
The following are SEM images of the fracture surface lower replica
http://img683.imageshack.us/img683/4112/te107h.tif
http://img199.imageshack.us/img199/8406/te107b.tif
http://img198.imageshack.us/img198/3513/te107c.tif
Was looking for distinguishing features which might point to the damage mechanism. Any comments?
Thanks
RE: Phenolic resin filler - barite
Thanks for the images. From what I can see you have fracture initiated at a flow line. The filler particles are huge and that's a problem. Large particles (or agglomerates of small ones) make for brittle materials. As a rule of thumb, fillers for plastics should be around 2 microns in size with no particles larger than 10-20 microns. The ones in your SEMS are way larger than that. See if you can find a supplier of a more appropriate grade of BaSO4.
All the best,
Chris
Chris DeArmitt
www.phantomplastics.com
Consulting to the plastics industry
RE: Phenolic resin filler - barite
We've gone back and done some more SEM work. Turns out that the BaSO4 was a red herring - and likely contamination in sample prepration.
What we are seeing are a lot of silicon in the EDS scans, and what you previously commented was BaSO4 is likely silica.
However, we also found traces of iron (<1% by weight), most likely in the form iron oxide. More interesting is the particle morphology of these iron particulates.
See:
Sample 1
http://img14.imageshack.us/i/21580130.tif/
Sample 2
http://img199.imageshack.us/i/52150912.tif/
A few questions:
The iron oxide looks intentional, and imbedded in the polymer. What role would it play, even in those small amounts? Colouring? (the plastic was red)
Would the difference in the particle morphologies for the two above samples affect mechanical properties? I'm guessing that the larger particle would lead to a more brittle plastic as suggested by your previous thread - crack propagation could just follow the particle boundaries.
Thanks for your comments
RE: Phenolic resin filler - barite
It's used in thermosets to provide a barrier to protect against corrosion.
http://www.epoxyproducts.com/mio.html
Chris DeArmitt
www.phantomplastics.com
Consulting to the plastics industry
RE: Phenolic resin filler - barite
Chris DeArmitt
www.phantomplastics.com
Consulting to the plastics industry