Pet Safety / Compounds / R-600a (Isobutane / HC-600a refrigerant)

Is R-600a (Isobutane / HC-600a refrigerant) safe for dogs and cats?

Low risk for pets

No concern at normal use.

What is r-600a (isobutane / hc-600a refrigerant)?

Also known as: ISOBUTANE, 2-Methylpropane, 75-28-5, Trimethylmethane.

CAS number
75-28-5
Molecular formula
C4H10
Molecular weight
58.12 g/mol
SMILES
CC(C)C
PubChem CID
6360

Risk for dogs

Low risk

No concern at normal use.

Risk for cats

Low risk

No concern at normal use.

Regulatory consensus

5 regulatory and scientific bodies have classified R-600a (Isobutane / HC-600a refrigerant). The classifications differ — that's the data.

AgencyYearClassificationNotes
ASHRAE 34—A3 — lower toxicity, higher flammability
EPA SNAP—Acceptable in household and small commercial refrigerators/freezers (since 2011). Charge limit 57g (2.01 oz) initially, later raised to 150g (5.29 oz) in 2018
IEC 60335 2 24—International standard for household refrigerating appliances — specific provisions for flammable refrigerants
UL 60335 2 24—US adoption of IEC standard enabling hydrocarbon refrigerants
EU—Standard practice since 1990s — no restrictions for domestic appliances at allowed charges

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where pets encounter r-600a (isobutane / hc-600a refrigerant)

  • Domestic Refrigerators — Standard in all new domestic refrigerators/freezers worldwide (~1 billion+ installed units)
  • Mini Fridges — Compact and beverage coolers
  • Wine Coolers — Residential wine storage units
  • Water Coolers — Point-of-use water coolers and dispensers
  • Commercial Plug In — Small commercial self-contained units (bottle coolers, ice cream freezers)

Safer alternatives

Lower-risk approaches that achieve a similar outcome to R-600a (Isobutane / HC-600a refrigerant):

  • R-134a
    Trade-offs: Removes 95-99% of dissolved contaminants including metals, PFAS, nitrates; wastes 2-4 gallons per gallon produced (improving with newer systems); removes beneficial minerals; $0.05-0.25/gallon; requires pre-treatment for longevity.
    Relative cost: 1.2-2×
  • R-1234yf
    Trade-offs: Alternative approach; specific tradeoffs depend on application context, scale, and regulatory requirements. Full hazard assessment of alternative recommended before adoption to avoid regrettable substitution.
    Relative cost: 1.2-2×

Frequently asked questions

Is r-600a (isobutane / hc-600a refrigerant) safe for pets?

No concern at normal use.

What products contain r-600a (isobutane / hc-600a refrigerant)?

R-600a (Isobutane / HC-600a refrigerant) appears in: Standard in all new domestic refrigerators/freezers worldwide (~1 billion+ installed units) (Domestic Refrigerators); Compact and beverage coolers (Mini Fridges); Residential wine storage units (Wine Coolers).

Why do regulators disagree about r-600a (isobutane / hc-600a refrigerant)?

R-600a (Isobutane / HC-600a refrigerant) has been classified by 5 agencies including ASHRAE 34, EPA SNAP, IEC 60335 2 24, UL 60335 2 24, EU, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.

See R-600a (Isobutane / HC-600a refrigerant) in the pets app

Look up products containing r-600a (isobutane / hc-600a refrigerant), compare to alternatives, and explore the full data record.

Open in pets View raw API data

Sources (1)
  1. — expert_curation

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →