For your information Freeze 12 does not have any R142b in it.
It has Difluoroethane, also called R-152a or HFC-152a, is a chemical compound composed of carbon, hydrogen, and fluorine. Its molecular formula is C2H4F2.
And yes it does work better than R12 and R134a and I have been using it for the last ten years in all my trucks.
Believe what you want to but you also get better MPG with Freeze 12.

 

Alright, I checked this Freeze 12 out online and it looks like it really is better than R134a and it doesn't require a refrigeration license to buy it. The trouble is, it doesn't seem like it is readily available. I tried to find the location of a dealer and apparantly there is only one in the U.S., and they are in TN. It is on E-Bay, but I don't like buying that way. I like to walk into a store and walk out with a product. If my A/C doesn't work, I don't want to wait 2 weeks for someone to ship me what I need to fix it.

Bill, where do you buy this stuff?

 

Car Quest Auto Parts in Oskaloosa Ks. sells it but I buy mine down in KC Mo. at B&C Truck Electric, Inc., 1600 Campbell, Tel # (816) 421-2782.

It is sold all over the U.S. and made in Texas by TCC.
http://www.technicalchemical.com/freeze12.htm


Technical Chemical Company
3327 Pipeline Rd
Cleburne, TX 76033
P.O. Box 139
Cleburne, TX 76033
800-527-0885, 817-645-6088
Customer Service
800-598-6582
817-556-0983
817-556-0694 fax
817-556-3724 fax

Give them a call.

 

According to the EPA Johnsons Freeze 12 is a blend R134a and R142b. Check out the chart:http://www.epa.gov/ozone/snap/refrigerants/lists/chiller.html
Also according to the MSDS. Again, r134a and R142: http://shrunklink.com/zyu

R152b is NOT the same refrigerant as Freeze 12. It is not listed as an approved refrigerant in MVAC systems, and is by definition, illegal to use in an MVAC system. It has been submitted for EPA approval but has not yet been approved, seemingly because it is listed as a flammable gas. Testing so far looks promising, from what I can find online.

 

I take it that you like to argue, I do not. The MSDS you posted a link to says that Freeze 12 has Difluoroethane also.
http://en.wikipedia.org/wiki/Difluoroethane
The above link say that it is R-152a.
I take you new to A/C systems so if you have any questions I will be glade to help you. I was in this A/C game for over 40 years now. I used work installing those after market auto A/C units for a while also.
As I said above you may believe what ever you want to but I still say that Freeze 12 is the way to go for him.

 

No, I don't like to argue. I do, however, take exception to erroneous (and misleading) information being aimed at folks who may know little about MVAC systems.
Freeze 12 does not contain R152 (difluororoethane) in it's native state. It is a mixture of R134a (1,1,1,2-Tetrafluoroethane) and R-142b (chlorodifluoroethane).
As I said before, the R-142b is the (mineral) oil carrying component of the blend and contriibutes little or nothing to cooling at the pressures found in an MVAC system. It is also a volumizer and will lower the operating pressure slightly. The R134a is the refrigerant component of the blend.
Given that the R-134a in Freeze12 is doing the cooling, how can it cool better than R134a? There is no way it can, regardless of what you believe.

Freeze 12 is not a "bad" product. It works very well, just as well as R134a.
The only advantage to FR-12 over R134a (once you sift out the marketing hype) is that it can be used with mineral oil in an R-12 system. It is aimed at a segment of the market that knows little or nothing about MVAC systems and service.

It is just recently that Johnsons started putting the recommendation to "evacuate the system before adding FR-12" on their product in type large enough to read. They also fail to mention the very real possibility of fractionation and compressor damage from oil starvation, which is inherent to most R-12 replacement refrigerant blends. They don't mention the fact that it contains 80% of that awful R134 that it claims to replace. These things alone speak volumes about the product and it's intent.

I'm far from new at MVAC (and refrigeration systems in general), about 29 years from it. I'm sure you're experienced and very good at what you do. You're just badly mistaken about this particular product.

 

I always convert to R-134A with no problems. I don't even change anything in the system (if it is a functioning system). I just pull a good vacuum for about 1 hr, add the 8.5oz oil charge can and top off to 85% of the recommended R-12 amount. I have done this for years and have had no failures. There is more than one R-12 replacements, but they are designed for different applications. R-134A good for cars and refrigerators these days.

 

Gentlemen, please. I have looked at several sites describing Freeze 12 including both of the ones that you have provided links to and it appears that there is conflicting information on the internet (that's a shocker). Some sites state that Freeze 12 is a mixture of R134a and R142b while others state that it is a mixture of R134a and R152a. Honestly, I don't know who is right but, of the sites that I looked at, there seems to be more sites saying R152a. Anyway, the majority of sites say that Freeze 12 is EPA approved and that I don't need a license to buy it.

 

If freeze 12 was so wonderful why didn't GM, Ford, Mopar, Toyota, Nissan, VW, etc etc use it?
Oh yeah, dupont is bigger than all those auto makers,,,, mmmmmkkkkaaaayyyyyy

 

You're right. DUPONT is bigger than the other guys, that's why they got the bid. They can sell it at a cheaper cost. It has NOTHING to do with how well it works. It's the price to the auto builder. The cheaper the freon is the cheaper the cost of the a/c system to the consumer.

 

I have used Freeze 12 on several occasions with no detrimental effects. I get it at my local auto parts tho not all carry it. O'Reilly is a national chain that carries it in this area.

I have also used Enviro-safe with no problems. It is supposed to be flamable, but only under ceratin conditions and you would not find these conditions in an autombile. It is not readily available, and has no benefits over Freeze-12. In those instances where I did use it, the customer brought it to me. jd

 

All right! I starting printing a couple of these detailed posts and now I'm confused enough to decide I just don't need A/C in my 71 F250.

 

Why the big concern over the license?

epatest.com , take the 25 question open book test, fork over $20 and print out your license online. Then go buy any refrigerant you want.

I found it is way cheaper to take the test and buy R12 for my old system (total was barely over $100 for the test and 3# of R12) than to worry with conversion or what some 'drop in' replacement would do to my system.

 

Refrigerants aren't really the big issue that they used to be, when R12 was the price of gold. The arguements for alternatives made a bit of sense. Now that the price of R12 has dropped, there's really no need for alternatives.
R12 or R134a are your best choices. Freeze 12 is basically for people that don't want to repair their ac, just fill 'er up, and the others are for the folks that really need to defy "the Man".
If your 71 has the original Dealer add-on AC, you'll need to stay with R12. Those systems were a bit wimpy even when new (I've had a couple of them). They don't work well at all when converted, the condenser is very inefficient.

Corey872 has a very good point about the online test. If you have, or work on, older cars and want to do AC repair, take the test. R12 is getting to be affordable and that's what the old systems work best with.

 

Thanks, it is the original dealer add-on.