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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 | |
| 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 | |
| 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 | 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. |
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.
|