R600a Isobutane Refrigerant
R600a is refrigerant-grade isobutane, a single-component hydrocarbon refrigerant widely associated with household refrigerators, freezers and other small refrigeration equipment.
It has a very low GWP and zero ozone depletion potential, but its A3 safety classification means it must be used only in purpose-designed equipment with appropriate charge and ignition-risk controls.
Reference packaging includes 420 g and 6.5 kg formats. Confirm current filling specification, valve type and destination transport requirements before ordering.
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Description
R600a Isobutane Refrigerant
R600a is refrigerant-grade isobutane (C4H10), a single-component hydrocarbon refrigerant used extensively in small-charge refrigeration equipment.
Its best-known application is domestic refrigeration, including refrigerators and freezers. It also appears in selected small stand-alone commercial refrigeration products designed specifically for hydrocarbon refrigerants.
The U.S. EPA Technology Transitions reference table lists R600a at a 100-year GWP of 1. Its very low climate impact is attractive, but A3 flammability makes equipment architecture, refrigerant charge, electrical safety and service practice essential parts of product selection.
For deeper context, see the R600a refrigerant profile, Natural Refrigerants Guide and the Refrigerants for Applications hub.
Key R600a Refrigerant Properties
Key identity, climate and safety information for refrigerant-grade R600a.
R600a Technical Specifications
R600a is chemically isobutane, but refrigeration use requires controlled refrigerant-grade supply and purpose-designed equipment.
| Refrigerant Designation | R600a |
|---|---|
| Chemical Name | Isobutane / 2-methylpropane |
| Molecular Formula | C₄H₁₀ |
| Molecular Weight | Approx. 58.1 g/mol |
| Normal Boiling Point | Approx. -11.7°C |
| Refrigerant Type | Single-component hydrocarbon |
| Ozone Depletion Potential (ODP) | 0 |
| 100-Year Global Warming Potential | 1 — U.S. EPA Technology Transitions reference |
| ASHRAE Safety Class | A3 |
| Transport Hazard Class | Class 2.1 |
Use the current supplier SDS and product specification for refrigeration work. Generic isobutane or lighter-refill gas should not be assumed to meet refrigerant-grade purity and contaminant requirements.
Typical R600a Applications
R600a is strongly associated with purpose-designed, small-charge refrigeration equipment.
Household Refrigerators
R600a is widely used in refrigerators designed around hydrocarbon charge limits, sealed electrical components and the required service procedures.
Household Freezers
Freezers and combination refrigerator/freezer products form another major R600a application.
Small Stand-Alone Refrigeration
Selected compact display coolers and other self-contained refrigeration equipment use R600a when designed and approved for A3 refrigerants.
Read the Refrigerants for Applications and Natural Refrigerants guides for broader domestic and small-refrigeration context.
R600a Safety and Handling Considerations
R600a is A3. Flammable-refrigerant controls are therefore fundamental to product design, charging, storage and service.
A3 Flammability
Keep ignition sources controlled and follow the equipment’s refrigerant charge, ventilation and component requirements.
Small-Charge System Design
R600a’s common applications typically rely on purpose-designed small refrigerant charges and equipment construction appropriate to hydrocarbons.
Service Practices
Use technicians, tools and leak-checking methods appropriate for flammable refrigerants and recover refrigerant according to local requirements.
Do not convert an R134a or other refrigerator to R600a simply because both refrigerants are used in domestic refrigeration. The compressor, charge, electrical design, tubing, controls and safety certification are system-specific.
R600a Product Specification & Documentation
Product documentation should identify refrigerant-grade R600a and the exact package / valve configuration supplied.
| Refrigerant Identity | R600a / refrigerant-grade isobutane |
|---|---|
| Composition | Single-component isobutane |
| Supplied Form | Liquefied flammable refrigerant gas |
| Transport Classification | Class 2.1 flammable gas |
R600a Refrigerant Packaging Options
The supplied product information includes small-container and cylinder R600a formats.
| Packaging Type | Reference Size | Supply Note |
|---|---|---|
| Small Can | 420 g | Small-volume service and distribution supply |
| Cylinder | 6.5 kg | Distributor and production supply |
Confirm package construction, valve, filling weight, transport quantity and destination-specific flammable-gas requirements before ordering.
R600a Is a Mainstream Very-Low-GWP Route for Purpose-Designed Domestic Refrigeration
R600a has become a major refrigerant in modern household refrigeration because it combines low direct climate impact with good performance in purpose-designed small-charge systems.
This market shift does not make R600a a universal retrofit gas for older R134a appliances. Equipment architecture and safety requirements differ.
- New appliances: select R600a only when the product is designed, listed and charged for it.
- Service: use the refrigerant shown on the appliance nameplate and follow the manufacturer’s procedure.
- Climate benefit: GWP 1 supports very low direct refrigerant climate impact when leakage and end-of-life handling are properly managed.
A modern R600a refrigerator and an older R134a refrigerator can serve the same user need while using different compressors, charge masses, controls and safety designs.
R600a Refrigerant Frequently Asked Questions
What is R600a refrigerant?
R600a is refrigerant-grade isobutane, a single-component hydrocarbon refrigerant used mainly in domestic and small stand-alone refrigeration.
What is the GWP of R600a?
The U.S. EPA Technology Transitions reference table lists R600a at a 100-year GWP of 1.
Is R600a flammable?
Yes. R600a is classified A3 and must be used with equipment and service practices designed for flammable refrigerants.
Where is R600a used?
Its main applications are household refrigerators, freezers and selected small self-contained refrigeration products.
Is R600a the same as generic isobutane?
The molecule is isobutane, but refrigeration use requires refrigerant-grade product quality. Generic fuel or lighter-refill products should not be assumed suitable.
Can R600a replace R134a in an existing refrigerator?
Do not assume so. Refrigerant charge, compressor, electrical design, tubing and safety certification differ between equipment platforms.
Product information on Refrigerants.net is provided for product identification, comparison and B2B purchasing research. Final refrigerant specification, packaging, availability, transport requirements, permitted use and equipment compatibility should be confirmed against current product documentation, SDS, OEM requirements and applicable regulations before purchase or use.
Additional information
| Application | Commercial Refrigeration, Domestic Refrigeration |
|---|---|
| Composition Type | Single Component |
| ASHRAE Safety Class | A3 |
| Package Size | 420 g, 6.5 kg |
| Packaging Type | Disposable Cylinder, Small Can |
| Refrigerant Number | R600a |
| Transport Hazard Class | Class 2.1 |
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