R503 Composition
Mole percentage: R23 accounts for 49.97%, R13 accounts for 50.03%
Mass percentage:R13accounting for 59.9%,R23Accounting for 40.1%
R503 Refrigerant Parameters
| Name: R503, CFC/HFC-503 | Classification: Mixed refrigerants |
| Molecular weight: 87 | Molar mass: 87g/mol |
| CAS Number: 75-72-9/75-46-7 | Critical temperature: 18.4℃ |
| Critical pressure: 4.28MPa | Boiling point: -87.5℃ |
| Ozone Destruction Potential (ODP): 0.6 | Global Warming Potential (GWP): 13,000 |
Product identity
- Safety class
- A1
- Type
- CFC azeotrope
- GWP
- 13000 (IPCC AR4)
- ODP
- 0.6 (ozone-depleting substance, controlled under the Montreal Protocol)
Application areas
Grouped by equipment type, for selection reference only; the equipment manufacturer's requirements and local regulations prevail.
Regulatory and compliance status (R503 / R503 (R23/R13 azeotrope)) — fully phased out
R503 (R503 (R23/R13 azeotrope)) belongs to the chlorofluorocarbons (CFC), with an ODP of 0.6, and is a Class I controlled substance under the Montreal Protocol. Production and consumption have been fully halted worldwide, with presence only in very few exempted uses (e.g. essential-use exemptions, feedstock uses) and in the recovery and reclamation sector. The following are the regional status as of 2026.
EU
- RegulationOzone-Depleting Substances Regulation (EC) 1005/2009
- StatusProduction, placing on the market and use fully prohibited
- ExemptionsOnly essential uses (e.g. metered-dose inhalers), feedstock and laboratory uses may apply for exemption
- For R503Not permitted for new installations or servicing top-up; equipment must be retrofitted or replaced with alternative refrigerants
US
- RegulationClean Air Act Title VI + SNAP program
- StatusClass I substance, production and import halted since 1996
- Existing stockOnly reclaimed refrigerant is permitted for the maintenance of existing stock equipment
- For R503Only reclaimed product may be used for existing equipment; no new production/import permitted
China
- RegulationRegulations on the Administration of Ozone-Depleting Substances (2024 revision)
- StatusCFC class fully phased out; production and use prohibited
- Existing stockReclaimed refrigerant may circulate within the filing and registration system
- For R503No legal supply of virgin product; equipment must be retrofitted or decommissioned
Japan
- RegulationOzone Layer Protection Act + Act on Rational Use and Proper Management of Fluorocarbons
- StatusSpecific fluorocarbons (CFC) fully abolished
- Existing stockReclaimed refrigerant limited to existing equipment
- For R503No supply of virgin product; must be retrofitted or replaced
Other countries and regions (grouped by the Kigali Amendment)
Apart from the four columns of EU / US / China / Japan, the global 170+ Kigali parties all comply under the A5 (developing countries) / non-A5 (developed countries) groupings of the Montreal Protocol, and none impose equipment-level bans. The grouping determines the HFC reduction pace and is unrelated to geography — for example, the Middle East Gulf and India belong to A5 Group 2, while Brazil, Mexico and Chile belong to A5 Group 1 (same group as China). The table below is a quick reference for the groupings of major markets:
| Grouping | HFC reduction pace | Major countries / regions (representative) |
|---|---|---|
| A5 Group 1 (developing countries, including China) | 2024 freeze → 10% reduction by 2029 → 30% by 2035 → 50% by 2040 → 80% by 2045 | Brazil, Argentina, Chile, Colombia, Peru, Mexico, South Africa, South Korea, Thailand, Indonesia, Malaysia, Vietnam, Egypt, Nigeria, etc. (about 140 countries in total) |
| A5 Group 2 (high-ambient-temperature group, HAT) | 2028 freeze → 10% reduction by 2032 → 20% by 2037 → 30% by 2042 → 85% by 2047 | India, Bahrain, Iran, Iraq, Kuwait, Oman, Pakistan, Qatar, Saudi Arabia, United Arab Emirates |
| Other non-A5 (developed countries, except EU/US/Japan) | 85% reduction by 2036 / reduced to 15% by 2050 | Canada, Australia, New Zealand, Switzerland, Norway, United Kingdom, Russia* (first two steps delayed: 5% by 2020, 35% by 2025), etc. |
For R503: globally phased out, no legal supply of virgin product. For the complete list of Parties and groupings, refer to the UNEP Ozone Secretariat (data version 2026.09).
Supply & Ordering
- Packaging
- cylinders / ton drums / ISO tanks / tankers (by grade and order size)
- Minimum order
- confirmed on enquiry; negotiable for bulk purchases
- Terms & lead time
- FOB / CIF / EXW and others confirmed on request
Please confirm the exact packaging, minimum order and lead time via the enquiry form below.
About WULA
WULA was founded in 2013. We are a refrigerant supply organizer, focused on moving goods from the production line to the customer's own line and site.
- Compliance paperwork
- We help customers meet compliance requirements: sales filing, per-transaction verification, quarterly reporting and three-year retention of documents.
- Order handling
- Scattered orders are managed through consolidated, data-driven administration to keep procurement efficient.
- Supply allocation
- Forecasting and coordinated allocation across multiple warehouses, to keep supply stable.
Need a quote or technical documents for R503?
Get current pricing, packaging options, MSDS and compliance files. Send us your requirement and our sales and technical team will get back to you shortly.
Bulk orders, custom packaging and other technical questions are all welcome.
Regulatory data updated: 2026-09-18 · v2026.09.12
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