I know of no one, no example, of anyone having a flame or fire problem with
using the CAS 75/HFC152a. If you know of any ACTUAL l cases I certainly
would like to know, and read the case history about it.

On Mon, Sep 27, 2021 at 7:45 AM John Rodgers <jrodgers113@gmail.com> wrote:

> Those things were replaced but not the hoses.
>
> On Mon, Sep 27, 2021 at 7:38 AM Steve Bonde <seb007@live.com> wrote:
>
>> You may want to be careful with this Freon (152a). While it’s considered
>> a substitute for R 12, it is flammable where 134a is not.
>>
>> Molecule size isn’t really the issue. The tetrafluoroethane used in 134a
>> is much larger than the difluoromethane you’re suggesting without the
>> flammability.
>>
>> R 401a is a mixture of 152a and 124, and has a much lower flammability.
>>
>> When you made the change, did you replace the oil, filter, and drier as
>> well?  That was the problem with my pickup.
>>
>> Sent from my iPhone
>>
>> > On Sep 26, 2021, at 9:48 PM, John Rodgers <jrodgers113@gmail.com>
>> wrote:
>> >
>> > The summer is most gone and so is the need for AC but it sure was nice
>> to
>> > have earlier. Back when I had my '88 van, I dutifully switched my system
>> > over to R-134a because R12 was going out and what little was available
>> was
>> > astronomical in cosy.  I changed the service fittings, purged the
>> system,
>> > then vacuumed the system, and added the appropriate amount of 134a. This
>> > was in spring. By mid summer the refrigerant pressure had dropped and
>> was
>> > no longer cooling properly. I added 134a and brought it back up to
>> speed.
>> > By fall of the first year the pressure was back down. This was a
>> > puzzlement. there was no sign of leakage any where. I didn't refill it
>> as
>> > cooler weather had set in but I knew the problem had to be solved by
>> spring
>> > when I had to service it again.
>> >
>> > During the winter I stumbled across a discussion about molecule size of
>> > various refrigerants and how their sized was affected by hose design. It
>> > would seem that 134a has much smaller molecule size than R12, and
>> > consequently the stuff over time would leak right through the old
>> original
>> > hoses. And the original hoses is what I had. While pondering this
>> > situation I stumbled on a video of Dustaway keyboard and computer
>> cleaner
>> > being used as a refrigerant to service the AC SYSTEM. Supposedly the
>> specs
>> > were similar to R-12 at least in molecule size so there should be only
>> > minimum leakage. It works great as a refrigerant cooling with the best
>> of
>> > them. and I haven't changed or added to the system for a couple of
>> years.
>> > You can find videos on Youtube about this. And if you decided to try it,
>> > make sure your can says on it somewhere CAS 75-37-6
>>
>