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Substitutes in Rigid Polyurethane & Polyisocyanurate Laminated Boardstock
Substitutes are reviewed on the basis of ozone depletion potential, global warming potential, toxicity, flammability, and exposure potential. Lists of acceptable and unacceptable substitutes are updated several times each year. A chronological list of SNAP updates is also available.
Note: SNAP Notices and Final Rules published in the Federal Register take precedence over all information on the web site.
Acceptable Substitutes
| Substitute | ODS Being Replaced | Comments |
|---|---|---|
| HCFC-123 | CFC-11 | |
| HFC-134a | CFC-11, HCFCs | |
| HFC-152a | CFC-11, HCFCs | |
| HFC-245fa | CFC-11, HCFCs | |
| HCFC-141b/HCFC-123 Blends | CFC-11 | |
| Formic Acid | CFC-11, HCFCs | |
| Saturated Light Hydrocarbons (C3-C6) | CFC-11, HCFCs | |
| Electroset Technology | CFC-11; HCFC-22, HCFC-142b, and blends thereof | |
| Carbon Dioxide | CFC-11, HCFCs | |
| Water | HCFCs | |
| Exxsol Blowing Agents | HCFCs | |
| 2-Chloropropane | CFC-11, HCFCs | Analysis of toxicity data available suggest an acceptable exposure limit of 350 ppm (8-hour time-weighted average). |
| Methyl Formate | CFC-11, HCFCs | |
| Ecomate | CFCs, HCFCs | |
| Transcend™ Technologies | CFCs, HCFCs | Acceptable as an additive to SNAP-approved blowing agents in blends making up to 5% by weight of the total foam formulation. |
| HFC-365mfc | HCFC-141b; HCFC-22, HCFC-142b, and blends thereof | HFC-365mfc is mildly flammable and has a 100-yr global warming potential of 794. Observe recommendations in the manufacturer’s MSDS and guidance for using this compound, particularly to address its potential flammability. Follow safe handling and shipping as prescribed by OSHA and DOT. CAS Reg. No. is 405-58-6. |
| Formacel® TI | HCFC-22, HCFC-142b | Observe recommendations in the manufacturer’s MSDS and guidance for using these blends. |
| HFO-1234ze | HCFC-22, HCFC-142b, and blends thereof | HFO-1234ze is non-flammable and has a 100-year global warming potential of 6. Its CAS Reg. No. is 29118-24-9. It has a recommended workplace exposure limit of 1000 ppm. |
| Trans-1-chloro-3,3,3-trifluoroprop-1-ene | CFC-11, HCFC-141b | Trans-1-chloro-3,3,3-trifluoroprop-1-ene has
an ODP of approximately 0.00024 to 0.00034. It has a 100-year
GWP of 4.7 to 7. Its CAS Reg. No. is 102687-65-0. The manufacturer recommends an acceptable exposure limit of 300 ppm (8-hr TWA) for trans-1-chloro-3,3,3-trifluoroprop-1-ene. |
Substitutes that are Acceptable with Use Conditions
| None at this time for either CFC-11 or HCFCs. |
Substitutes that are Acceptable with Narrowed Use Restrictions
| None at this time for either CFC-11 or HCFCs. |
Unacceptable Substitutes
| Substitute | ODS Being Replaced | Further Information |
|---|---|---|
| HCFC-124 | All | Alternatives exist with lower or zero-ODP. |
| HCFC-22, HCFC-142b or blends thereof | CFCs, HCFC-141b | Alternatives exist with lower or zero-ODP. |
| HCFC-141b | All | Alternatives exist with lower or zero-ODP. Exemptions exist for (1) the use of HCFC-141b for space vehicle, nuclear and defense foam applications, (2) the use of HCFC-141b for laboratory research and development applications for foreign customers and (3) the use of fully formulated HCFC-141b foam systems in inventory before January 1, 2005, until July 1, 2005. See the September 30, 2004, final rule, 69 FR 58269, for further information. |