OAR Policy and Guidance Metarecord

Document Title/Subject: Interim Final Rule Prohibiting the Use of MT-31 Related Documents:	Signed by: Signature Date: Contact: Kevin Rosseel	Filename(s): URL(s): http://www.epa.gov/fedrgstr/EPA-AIR/1999/January/Day-26/a1764.htm http://www.epa.gov/ozone/snap/regs/64fr3861.pdf
Regulatory Authority: Title 6	Division/Director: Stratospheric Protection Division (OAP) / Drusilla Hufford	Submitted By: dibble.christine	OGC Contact: Jan Tierney OGC Phone#: 202.260.5095	Internet Contact: Kevin Rosseel
Document Type: Proposed & Final Preambles & Rules,	EPA Document Number: Federal Register: 64 FR 3861 01/26/99	Supersedes:
Subject Category: AIR ENVIRONMENTAL PROTECTION AGENCY GOVERNMENT HUMAN HEALTH Ozone	Keywords: Ozone Ozone layer phaseout ODS ozone-depleting stratosphere CFC chlorofluorocarbon solvent Montreal Protocol class I class II hexafluoropropylene refrigeration MT-31 HCFC-22 R-22	Terms: Clean Air Act CAA Environmental policy
Abstract: With this action, EPA's Significant New Alternatives Policy (SNAP) program lists as unacceptable for all refrigeration and air-conditioning end-uses the refrigerant blend known by the trade name MT-31. This refrigerant blend was previously listed as an acceptable substitute for CFC-12 and HCFC-22 in various end-uses within the refrigerant and air-conditioning sector. After June 3, 1997, the date on which EPA published the Notice of Acceptability that listed MT-31 as acceptable, EPA became aware of toxicity data concerning one of the chemicals contained in the MT-31 blend that present significant concerns about risks to human health that may arise as a result of the use of this chemical, either alone or in a blend, in the refrigeration and air-conditioning sector. Today, therefore, EPA is removing MT-31 from the list of acceptable substitutes, and is listing MT-31 as unacceptable in all refrigeration and air-conditioning end-uses.

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