On Monday, May 5, 2008, at 00:30 US/Pacific, Duncan & Ami McFadyean
wrote:
> I'm not aware that the Europa tank is made of HDPE; which is actually
> highly resistant to a wide range of chemicals, hence its widespread
> use as basal liners to landfills.
> I don't suppose the HDPE automotive tanks are rotary moulded either.
Duncan,
My apologies...I incorrectly gathered from the thread that our tanks
were HDPE; hopefully, we'll learn soon enough for certain.
The article I referenced on 5/4,
http://www.tms.org/pubs/journals/JOM/9607/Alvarado-9607.html#ToC7 ,
dated 1996, about HDPE tanks in automobiles, does mention "rotary style
blow-molding machines" which I took to be equivalent to the
"roto-molded" process mentioned in Europa literature; again, I may be
incorrect.
What struck me about the article was that back in 1996 in the auto
industry there was no consideration for the use of LDPE...and it
includes a nice synopsis of the evolving HDPE technology (barrier
coatings, mono vs. multi-layer), regulatory issues (permeability
standards), and fuel compatibility (methanol/ethanol, additives,
flex-fuel vehicles).
Fred
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