Originally Posted by Mayhem
@Systemlord Yeh we have done accelerated testing to see what the main issues were and what caused leaching. We have also tested the DEHP in the same situations (this has been going on now for over 9 months of testing.
Test was done like so ->
All tubing was tested using the following procedures.
• Clean sterile glass containers
• A) 25c constant temp with stirrer
• B) 35c constant temp with stirrer
• C) 45c constant temp with stirrer
• 1) Ultra Pure water @ 0.01TDS / 0.01Us
• 2) 20% Vegetable extract, 80% UPW (5% to 15% is normally used in premixes)
• 3) 20% Ethylene Glycol, 80% UPW (5% to 15% is normally used in premixes)
• 4) 20% Propylene Glycol, 80% UPW (5% to 15% is normally used in premixes)
• 5) 20% Potassium Formate, 80% UPW (5% to 15% is normally used in premixes)
• 6) 100% UPW, Silver Kill Coil
• 7) 100% UPW, 5 drops of Biocide Extreme
• 8) 100% UPW, 5 drops of Biocide Extreme, Silver Kill Coil
• 9) 100% tap water
• 10 )100% Halfords DI water
* Later on we started testing Pastel Ice White. to see its effects.
Each 10mm peace of tube from the different manufacturers had to go though all of these tests. We've only tested id say about 5% of the markets tubing as it basically became a mammoth task so we just took some select samples and spent the last few months going though it all to see what the real issues were. So there was a total of 10 tests at 3 different temps each test was run for 5 hours in total. We took measurements before and after each test and checked under the microscope the tubing as each market point to see how much was leached out of the plastic. We then left the tube for 48 hours in a sealed container and re checked it to see if it had reformed back.
We came to the simple conclusion heat is the main issue followed by biocide used. We would love to have more time to investigate but these tests were done for us and us alone to find out what the issues are so we can better understand our users concerns and support you guys better with real world knowledge and a better understanding. Also to see if we needed to adjust out mixtures at all.
It would be nice to see some real scientific studies into this but alas we cannot afford to do such tests and im sure no one else out there is prepared to throw money at such testing.
@Martinm210 DEHP is in a lot of stuff but if you speak to manufacturers of bottles you can get it with out it. I know ours do not contain it as this is some thing i checked early on. Also if you check out some posts by me on XS from a good few years ago i said that certain 25 Ltr jerry cans we had been making liquids in seemed to have a high PPM count compared to other barrels. We found out this was due to DEHP and leaching.
What people need to remember though is DEHP is a plasticizer and all that is happening is DEHP is being replaced by a different plasticizer so again this issue may rear its ugly head but in a different form later on. We will just have to sit back and see what happens.