Fredrik Nyström
Linköping
Här sen Jun 2004
Inlägg: 1007

02 Feb 2013 00:16
Jaha där ser man, tydligen så kan etylenglykol göras tämligen ofarligt genom inblandning av minst 11 viktprocent propylenglykol.
http://ferrarichat.com/forum/technical-q/132714-getting-rid-used-brake . . . .
Citat: | Evans coolant has a product you can add to eytheleneglycol to make it non-toxic.
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Ethylene Glycol Poisonings Can Be Stopped!
A Disclosure of the EVANS DE-TOXT Process for the Detoxification of Ethylene Glycol
Evans Cooling Systems, Inc. (ECS) is pleased to provide the following disclosure of its discovery of a practical alcohol dehydrogenase (ADH) enzyme inhibitor that is effective in detoxifying ethylene glycol (EG). US and Foreign Patents Pending.
This technology was disclosed to the U.S. Environmental Protection Agency in communications dated Sept. 17, 2001. A general news release and full public disclosure followed on Oct. 8, 2001.
The information herein was revised Feb. 13, 2002 upon a finding that
the oral rat LD50 value for ethylene glycol is 8,300, not 4,700 mg/kg.
Abstract
It is estimated that approximately 4,500 humans are poisoned and 90,000 domestic animals plus countless wild animals die annually in the USA by ethylene glycol (EG) from products such as antifreeze. Ingested EG is not itself toxic until it becomes metabolized by the alcohol dehydrogenase (ADH) enzyme to glycoaldehyde and then metabolized further to other toxic metabolites. The inventors of the Evans De-ToxT process have discovered that a practical and inexpensive substance, namely propylene glycol (PG), when mixed with EG, acts as an ADH enzyme inhibitor, preventing the metabolism of EG and preventing the toxic metabolites that are the essence of EG poisoning. The effectiveness of the method has been proven in a series of laboratory tests using Sprague-Dawley rats according to GLP test procedures in a facility certified by the EPA. The LD50 value of EG is 8,300 mg/kg. Mixtures of 50% EG/50% PG (by wt.) and 70% EG/30% PG (by wt.) are demonstrated to be so low in toxicity that LD50 values for them cannot be determined. The LD50 value for a mixture that is 95% EG/5% PG (by wt.) was experimentally found to be approximately 15,000 mg/kg, a figure that indicates a very low toxicity and that compares to the toxic LD50 value of 8,550 that would be predicted by using a standard industry formula. Poisonings by ingestion of products containing EG are preventable by simply including a modest percentage of PG in the mixture. This fact should be the subject of an EPA mandate.
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Revision required
Evans Cooling Systems, Inc. was informed by letter dated February 7, 2002, from the American Chemistry Council (ACC), that the LD50 value for EG of 4,700 mg/kg, a value that has been published for years in numerous MSDS documents and published elsewhere by respected sources, including the NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) is incorrect. Soon after the October 2001 disclosure by ECS of its DeToxT technology, the ACC undertook the re-translation of the Russian language publication, written in the early 1980's, that has been the supposed source of the 4,700 mg/kg figure. Two significant errors were found in the original translation. First, the 4 and the 7 were transposed. The figure was 7,400, not 4,700. Compounding the first error was that the study results in ml/kg somehow became mg/kg in the literature. As the specific gravity for EG is about 1.120, the correct LD50 value for EG is 8,300 mg/kg. ECS is indebted to the ACC for taking the initiative to correct the LD50 information and bring it to ECS' attention.
The basic thesis of the original disclosure remains. Tests that were performed, however, using rats at dosages less than 8,300 mg/kg are recognized as irrelevant and have been removed from the revised disclosure. Projections from tests performed using rats at dosages less than 8,300 mg/kg are also removed. Based on the higher LD50 value for rats against which ECS compares its experimental results, ECS' current thinking is that EG poisoning can be prevented if a quantity of propylene glycol (PG) equal to about 11 percent of the weight of the EG is mixed with the EG. Previously, ECS had thought that about 5 percent would suffice.
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Copyright c 2005 Evans Cooling Systems, Inc. Page last revised 08/15/2005 |
_________________ Fredrik Nyström
EVO VI TME -00
C220 d kombi -16
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RallyQuattro
Stockholm
Här sen Mar 2007
Inlägg: 9445

09 Aug 2014 09:44
Re:
flandrs skrev: | Evans är halt när det kommer ut på marken.
Vatten har bättre värmeledningsförmåga under 100 c dock bara några få %
Vatten kokar alltid vid hundra c oavsett om det är glykol i eller inte.
I go for evans |
Finns det test bevis på antal grader som skiljer i kylning under o över 100grader mellan Evans mot vatten?
Att vatten kokar alltid vid hundra stämmer inte,
Med tryck i vattnet som du har i kylsystemet så ökar ju kokpunkten till 120-130 grader är Evans fortfarande sämre då ända tills vattnet kokar?
Hittade detta:
"Systemtrycket ligger kring 1,5 bar normalt, något högre i motorn genom kylvätskepumpen är möjligt.
Med glykol-vatten så ska detta övertryck ge en kokpunkt på ca 130 grader (Saab uppger 131 grader vid 1,4 bar).
På tävlingsbilar är det dock vanligt att köra med högre tryck, exempelvis så ska en F1 motor ligga kring 3,5 bar."
Många skriver att Evans kyler sämre o måste därför pumpas fortare igenom systemet för att få samma kylförmåga? stämmer det?
_________________ Martin Ehrsson RS8
Äger 2st Urq 20v-90:or, RS8:a
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