CPVC Coloring
CPVC Coloring
(OP)
Hello All,
A new rev of a product is using a 3" Schedule 80 CPVC pipe as a pressure tube and solid stock for 2 endcaps, instead our the typical anodized/painted aluminum. The product is for a long term (1-3 year) deployment in ocean water at depths up to 200m. From a sellers perspective, this is fairly high end equipment and I would prefer not to ship it out 100% gray, looking like it was glued together in the Home Depot parking lot. My issue is I can't find a supplier to sell me colored (would like yellow, but will take anything a this point) CPVC pipe in lots less than 2500 feet. That's a lot of pipe to store. Is there something inherent in CPVC manufacturing that making coloring more difficult than PVC? I thought they just impregnated it with chlorine, making it more ductile (which is why we need it). Perhaps it's not a good enough market to justify small runs.
I have also had similar difficulties identifying a paint that won't easily flake off when dinged while on our assembly floor. Any input on that front would also be welcomed.
--Adam
A new rev of a product is using a 3" Schedule 80 CPVC pipe as a pressure tube and solid stock for 2 endcaps, instead our the typical anodized/painted aluminum. The product is for a long term (1-3 year) deployment in ocean water at depths up to 200m. From a sellers perspective, this is fairly high end equipment and I would prefer not to ship it out 100% gray, looking like it was glued together in the Home Depot parking lot. My issue is I can't find a supplier to sell me colored (would like yellow, but will take anything a this point) CPVC pipe in lots less than 2500 feet. That's a lot of pipe to store. Is there something inherent in CPVC manufacturing that making coloring more difficult than PVC? I thought they just impregnated it with chlorine, making it more ductile (which is why we need it). Perhaps it's not a good enough market to justify small runs.
I have also had similar difficulties identifying a paint that won't easily flake off when dinged while on our assembly floor. Any input on that front would also be welcomed.
--Adam





RE: CPVC Coloring
The other effect of CPVC is that it's not nice to process, tending to scorch in the extruder if you're not careful. The higher processing temps could make it more difficult to color (not sure) but most likely is just that it's not as common as PVC so color choice will be more limited.
Based on what you've mentioned I'd go for normal PVC.
Chris DeArmitt PhD FRSC CChem
www.phantomplastics.com
Consultant to the plastics industry
RE: CPVC Coloring
Didn't take the time to do a research search to my standards, but for these purposes, it would seem the CPVC wikipedia page would agree:
"Mechanical properties
The principal mechanical difference between CPVC and PVC is that CPVC is significantly more ductile, allowing greater flexure and crush resistance. Additionally, the mechanical strength of CPVC makes it a viable candidate to replace many types of metal pipe in conditions where metal's susceptibility to corrosion limits its use."
I'm by no means closed minded, I'm more than happy to review some literature that lays out contrary evidence/
RE: CPVC Coloring
Polymers like polystyrene are brittle under tension and yet perform great under compression, for example as proppants for oil exploration.
Chris DeArmitt PhD FRSC CChem
www.phantomplastics.com
Consultant to the plastics industry
RE: CPVC Coloring
RE: CPVC Coloring
You might want to contact the company mention in this paper.
h
If the above link doesn't have what you need I would also look at fire protection CPVC piping.
RE: CPVC Coloring
Regards
Pat
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RE: CPVC Coloring
You might try the primer to see if will give you a more durable coating.