Refrigerant Gases Freon™/Opteon™

Mihama Refrigerant Gases Freon™/Opteon™ Freon M-099

Freon M-099

Freon™ MO99™ refrigerant (R-438A) combines R-22 pressure-enthalpy characteristics with mineral oil compatibility in a unique HFC refrigerant that can be used to replace R-22 over a wide range of evaporator temperatures. In most cases, all that needs to be done is recover the R-22, replace critical seals, charge refrigerant, restart and monitor for leaks, and you’re done. Replacing R-22 can’t get any easier.


Components CAS-No Value type (Form of exposure) Control parameters / Permissible concentration Basis
Pentafluoroethane 354-33-6 TWA 1,000 ppm US WEEL
1,1,1,2-Tetrafluoroethane 811-97-2 TWA 1,000 ppm US WEEL
Difluoromethane 75-10-5 TWA 1,000 ppm US WEEL
Butane 106-97-8 TWA 800 ppm 1,900 mg/m³ NIOSH REL
STEL 1,000 ppm ACGIH
Isopentane 78-78-4 TWA 1,000 ppm ACGIH
Engineering measures Ensure adequate ventilation, especially in confined areas.Minimize workplace exposure concentrations.

Personal protective equipment

Respiratory protection General and local exhaust ventilation is recommended to maintain vapor exposures below recommended limits. Where concentrations are above recommended limits or are unknown, appropriate respiratory protection should be worn. Follow OSHA respirator regulations (29 CFR 1910.134) and use NIOSH/MSHA approved respirators. Protection provided by air purifying respirators against exposure to any hazardous chemical is limited. Use a positive pressure air supplied respirator if there is any potential for uncontrolled release, exposure levels are unknown, or any other circumstance where air purifying respirators may not provide adequate protection.
Hand protection Material Low temperature resistant gloves.
Remarks Choose gloves to protect hands against chemicals depending on the concentration specific to place of work. For special applications, we recommend clarifying the resistance to chemicals of the aforementioned protective gloves with the glove manufacturer. Wash hands before breaks and at the end of workday. Breakthrough time is not determined for the product. Change gloves often!
Eye protection Wear the following personal protective equipment: Chemical resistant goggles must be worn.Face-shield
Skin and body protection Skin should be washed after contact.
Protective measures Wear cold insulating gloves/ face shield/ eye protection.
Hygiene measures Ensure that eye flushing systems and safety showers are located close to the working place. When using do not eat, drink or smoke.Wash contaminated clothing before re-use.