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Microcare General Purpose Circuit Chiller

Micro Freeze is the environmentally-sophisticated answer for low temperature, non-destructive troubleshooting of electronic components.
Based on non-flammable HFC-134a, it meets the military standards for circuit coolers and will quickly freeze components. Micro•Freeze is safe for people and leaves no residues plus it is ozone-safe, non-toxic,
odour-free, nonconductive, plastic-safe and non-flammable. Not to be compared with the cheaper but highly flammable freeze sprays based on HFC-152b. (XYZ37)

For customers in Europe, a special version of the "freeze spray" product is available using a new, ultra-low global warming propellant. See "Micro·Freeze EU" in this web site (MCC-FRZ107).

Summary Technical Data
Active Ingredients: 100% (HFC-134a)
Toxicity Rating (PEL): 1,000 ppm
Ozone Impact: Zero
Organic Content: Zero
Global Warming Impact: 1,430 (100 yrs.)
Flashpoint (TCC): None
Flammability Rating: Non-flammable
REACH and ELINCS Compliant Yes
RoHS and WEEE Compliant Yes
SNAP Approved Yes
NFPA Ratings: Health=1, Fire=0, Reactivity=1

Size 10 oz. / 280 grams

The difference is that the FRZA is anti-static. Hence the A in the part number. The primary ingredient, HFC-134A, is the same in both products.
If you look at the MSDS you will note that the FRZA has a small amount of alcohol. This provides the static protection if you were to use the FRZA on a board that had power.
This was a much bigger issue before the introduction of SMT technology and bed-of-nails testing.

Today FRZ outsells FRZA by almost 8-1. Fifteen years ago that ratio would have been reversed.

In the end they both work very well. Though the FRZA will evaporate a bit slower because of the small amount of IPA

MCCFRZ - TDS