Hi James, Yes, HDPE is slightly permeable to O2, CO2 and N2. The permeability decreases sharply with an increase in thickness.
I have noticed no obvious signs of degradation, other than a slight plastic taste, and after two years I suppose that's inevitable. I would not be worried about any of these gases dissolving into the colloid, O2 is sparingly soluble in water and is probably at saturation anyway, same with N2. CO2 may dissolve to some extent, but that would depend on the pH of the colloid, and the manner in which the water and silver arrange. At most a slight drop in pH could be expected...even so, low concentrations of HCO is not toxic and should have little effect upon the stability of the colloid. The CS that I have stored in HDPE is in the bulk 10L containers that my D water came in, and are quite thick. I sell in HDPE containers for quantities 1L and over, but I still bottle in 200ml glass containers as I still have about 300 left, but I will investigate bottling into HDPE or PP shortly as the glass bottles and freight are my biggest expense. I foresee no problems other than consumer resistance. Cheers Ivan. ----- Original Message ----- From: "James Osbourne, Holmes" <[email protected]> > Hi Ivan and folks, > > What are your thoughts on the permeability of HDPE re: O2, CO2, long term storage? > > HDPE sure makes handling easier.... > > James Osbourne Holmes > [email protected] > FTNWO -- The silver-list is a moderated forum for discussion of colloidal silver. To join or quit silver-list or silver-digest send an e-mail message to: [email protected] -or- [email protected] with the word subscribe or unsubscribe in the SUBJECT line. To post, address your message to: [email protected] Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <[email protected]>
