I don't know.
Most of us try to avoid using the "foam core" PVC pipes in situations where the "foam" would be in water contact since I doubt that part of the pipe has been tested for potable water or food safety. I try to stick with the solid pipes and would probably make a point of avoiding the foam core pipes for use in things like "gravel guards and siphon bells where there would be an increased core contact with water. That is just what I've done because I haven't been able to find info about the material's safety.
Hay David, are you sure on that? There are pvc pipes meant for drain/waste and vent and sewer pipes that are not meant for potable water. There are also pvc pipes that are meant for electrical conduit.
The PVC being asked about is only a pvc shell with a different substance between that is not PVC but some sort of foam and I've seen similar pipes that were labeled for DWV pipes
Yep you are right Burton. Yes the worst part about the rigid pvc pipe has more to do with it's manufacturing than with anything it might leach into water.
And there is food or potable water safe plastics and some of them do contain stuff like PBA but are still "safe" according to the FDA or who ever gets to figure that out.
Sigh just gotta choose you comfort and spending level. Now I suppose one could get a sheet of HDPE plastic and roll it into a cylinder and cut slits or holes in it for a gravel guard. Or there is food grade polypropylene mesh that I've used for gravel guards.
Get to Know Your “GOOD & BAD” Recyclable Plastics by Number
HDPE pipe is a primary alternative to PVC (polyvinyl chloride) pipe for all piping applications and
is rapidly gaining market share for potable water, sewer, conduit and ducting, DWV (drain, waste
and vent,) agriculture, and ground drainage uses.
PVC creates dioxin, the most potent carcinogen known, as well as ethylene dichloride and vinyl chloride. These toxins can cause severe health problems including cancer, endocrine disruption, neurological damage,birth defects, and reproductive and immune system damage.
#2 - HDPE: high-density polyethylene is used in milk jugs, detergent and shampoo bottles, and, because it hasn't been found to leach, will replace polycarbonate in a new Nalgene bottle (more on that in a sec). It has also has not been found to leach, and is widely accepted and easily recycled.
No dioxin produced in manufacture
High abrasion and chemical resistance
Less susceptible to surge shocks
Seamless joint connections
Dioxin produced in manufacture
Moderate abrasion and chemical resistance
More susceptible to surge shocks
Joint seams can leak
#2 - HDPE: high-density polyethylene pipe:
Back to the 'foam core' in 4" PVC pipe - what is the foam core made out of?