Keeping the Best of HFCs, Plus Low GWP

Eliminating ozone-depleting chemicals continues to be a key environmental focus for Honeywell. As countries phase them out in accordance with the Montreal Protocol on Substances that Deplete the Ozone Layer, we have invested in both manufacturing capacity and additional R&D to help customers meet commitments to this global effort.

Honeywell’s fourth generation foam blowing agent, Solstice® Liquid Blowing Agent (LBA) was formulated to have a significantly lower global warming potential (GWP) and improved energy efficiency while retaining non-flammability and ease of conversion.

Honeywell Solstice LBA is a near drop-in replacement for liquid HCFC, HFC, hydrocarbons and other foam blowing agents. In addition, these properties continue to differentiate Honeywell foam blowing agents as the best choice for high performance rigid foam insulation applications and for those applications where a flammable foam blowing agent is unsafe, too costly to use, or fails to provide the desired foam performance.

The U.S. government is considering various approaches to address the use of high global warming potential (GWP) materials. In addition to regulatory-driven changes which are under consideration that may impact high global warming potential materials and drive higher performance foam insulation materials, there are also market pressures that favor the use of low GWP, high performance blowing agents like Solstice™ Liquid Blowing Agent (LBA) and Solstice™ Gas Blowing Agent (GBA).

Anticipating these regulations and similar initiatives globally, industry is preparing solutions to meet anticipated climate change regulations. Honeywell is an industry leader with our low GWP development program, including blowing agents, refrigerant gases, solvents and aerosols.

Solstice LBA

Solstice LBA has received all necessary regulatory approvals, including Toxic Substances Control Act (TSCA) and Significant New Alternatives Policy (SNAP) listings necessary for commercial sales of Solstice LBA and foam systems containing Solstice LBA. It is VOC-exempt as determined by the U.S. EPA.

Solstice GBA

Solstice GBA is used as a blowing agent for polyurethanes, polystyrene and other polymers. It has low environmental impact, as measured by its ultra-low global warming potential of less than 6 and is non-ozone-depleting.

It has been SNAP listed for all blowing agent applications in polyurethane and polystyrene foams. It also has received TSCA PMN approval and has been fully commercialized. It is VOC-exempt as determined by the U.S. EPA.


The measure that characterizes whether a chemical is a volatile organic compound (VOC) is the Maximum Incremental Reactivity (MIR). The measure (MIR) at which a chemical is generally considered to be a VOC, by U.S. regulation, is that of ethane.

Other low GWP materials, like propane or butane, because of their very short atmospheric lifetime, often prove to be VOCs that contribute to ground level ozone formation.

The Maximum Incremental Reactivity (MIR) of Solstice Liquid Blowing Agent has been measured at less than the value for ethane, and it is expected to be classified as VOC-exempt in the U.S.

Enovate 245fa

Enovate 245fa is non-ozone-depleting and is VOC-exempt.


Solstice LBA

Honeywell Solstice™ Liquid Blowing Agent (LBA) has a global warming potential (GWP) of <5, and is in the same GWP range as many other foam blowing agents that are considered low GWP solutions, such as hydrocarbons. Solstice LBA provides a path to help solve potential global warming issues facing the industry in Europe, while maintaining high thermal insulation performance and the safety benefits of a nonflammable foam blowing agent. Solstice LBA is REACH registered to 10MT. REACH registration for unlimited amounts is in progress.

Solstice LBA is not listed in the Annex I of F Gas regulation and thus not considered as F Gas.

Solstice GBA

Solstice Gas Blowing Agent is used as a blowing agent for polyurethanes, polystyrene and other polymers – also as a low GWP substitute for 134a. It has low environmental impact, as measured by its ultra-low GWP of less than 6 and is non-ozone depleting. Solstice GBA is fully compliant with the EU F-Gas regulation.

It has received Notification VIII, Level 1 by the EU Competent Authority for quantities to 1000 tonnes/annum, allowing commercialization in the EU, as of October 2008.

Solstice GBA is non-flammable by EU A11 test methods. However, the material does exhibit flame limits at elevated temperatures.


The European Union uses a different measure to characterize propensity for ground level ozone formation: photochemical ozone creation potential (POCP). POCP is reported as compared to ethane, which has a POCP of 12.3 (Nielsen, University of Copenhagen).

The POCP of Solstice LBA is estimated to be well below that of ethane and cyclopentane.

Enovate 245fa

Enovate 245fa is non-ozone-depleting and is registered under REACH.


Japan has made voluntary Kyoto Protocol commitments to reduce or limit emissions of greenhouse gases, though they have not officially declared domestic regulations to enforce these commitments.

Solstice Liquid Blowing Agent can play an important role in meeting Japan’s voluntary greenhouse gas reduction commitments.

Solstice LBA has been approved for commercial sale in Japan.

As climate change regulations are developed in other regions, they will likely contain similar global warming potential (GWP) limits in order to meet their Kyoto Protocol commitments.

Solstice LBA

We anticipate that Solstice™ Liquid Blowing Agent (LBA) will meet or exceed the requirements of these regulations and will be an integral part of any GWP reduction strategy.

Switzerland – Imports up to 10 metric tons per year allowed after Sept 16, 2013

Korea – On the chemical inventory or in compliance with the inventory

Product registrations for Solstice LBA are ongoing in the rest of the world.

Enovate 245fa

Canada – 245fa is on the CEPA-DSL registry

Japan – 245fa is registered on the J-CHECK data base, registration #5293. MITI # 2-3783 and  # 2-3947.

Also, 245fa is on the chemical inventory or in compliance with the inventory in China, Korea, Australia, and New Zealand.


GWP of less than 5 and No Impact to Ozone Layer

Solstice LBA is unsaturated (has a double bond structure), which means it has a short atmospheric lifetime. This has a dramatic impact on its environmental properties, specifically lowering the GWP to among the lowest value of any blowing agent available and eliminating any potential impact on the ozone layer.

Enovate 245fa (HFC-245fa)

Enovate 245fa is non-ozone depleting and is VOC-exempt in the U.S.