Harmony Technology: Refrigerant & Chemical Sourcing from China

Refrigerants, Chloromethanes, Intermediates & Specialty Gases — China chemical sourcing. We are a trading partner — not a manufacturer pretending to be one — helping importers buy the right product, with the right documents, in the right quantity.

Buyer Guides (Q&A)

• R404A / R507A / R448A / R449A: Composition, GWP and Retrofit Limits

  These four are not interchangeable. Composition determines glide, and glide determines whether a retrofit is a drop-in or a rebuild.

• HS Codes for Refrigerants and Chlorinated Solvents in 2026: What Your Broker Actually Needs

  The 6-digit HS code is a starting point, not an answer. Since HS 2022, single HFCs left the old 'catch-all' line and blends moved to a new heading — and the code.

• Refrigerant Charge Amount: How It Is Calculated, and Why A2L Systems Have a Room-Size Limit

  Two different questions get confused: 'how much does this system need' (performance) and 'how much may this room contain' (safety). They are governed by different.

• R134a System Compatibility: Pressure–Temperature Data, Lubricant Interaction, and Sealing Material Selection

  R134a (CAS 811-97-2, ASHRAE A1) runs higher pressure than R12 and is immiscible with mineral oil. Saturation tables, POE handling limits, and elastomer selection for retrofit or specification.

• R22, R32, R410A and R407C: Physical Properties Compared, and Why Drop-in Replacement Fails

  GWP (AR4/AR5), ODP, critical temperature and temperature glide compared — plus the mechanism by which a zeotropic blend like R407C changes composition on leakage.

• Dichloromethane (DCM, CAS 75-09-2): Specification Grades, UN Packing Requirements, and Export Documentation

  DCM has three commercial specification grades, a Class 6.1 classification (UN 1593), and a 39.6 °C boiling point that makes packaging selection a pressure problem — not a container-volume problem.

• Dangerous Goods Mixed Loading for Refrigerants and Solvents: IMDG Segregation, UN Marks, and Cylinder Stacking

  R32 and R134a share UN 3159 but carry different classes (2.1 vs 2.2). IMDG segregation degrees, UN packaging-mark decode, cylinder filling ratios and IBC ullage rules for mixed refrigerant and solvent cargoes.

• Reading a Chinese Chemical COA: Test Methods, Raw Data, and What Each Parameter Actually Proves

  A certificate of analysis is only as strong as the method behind each number. GC-FID purity, Karl-Fischer water, titration acidity — what each parameter measures, and what a COA cannot tell you.

• HFC Quotas and the EU F-gas Regulation: The Actual Mechanism, Numbers, and Phase-down Schedule

  Kigali Amendment phase-down and EU Regulation (EU) 2024/573 use the same unit of account (tonnes CO₂-equivalent) but different baselines and scopes. Production rights fall to 15 % of the 2011–2013 average by 2036.

What we do

• Refrigerants: R22, R32, R134a, R404A, R407C, R410A, R143a & blends
• Chloromethanes: DCM (dichloromethane), chloroform, carbon tetrachloride
• Chemical intermediates & specialty gases
• Compliance-first export: COA, MSDS, dangerous-goods packing, quota-aware supply