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Views: 0 Author: Site Editor Publish Time: 2026-07-24 Origin: Site
When buying ACR copper tube for air conditioning, refrigeration, HVACR installation or heat exchanger production, choosing the right copper tube standard is just as important as choosing the right size. Two buyers may order the same copper material from the same production line, but one needs ASTM B280 copper tube for inch-based markets while the other needs EN 12735 copper tube for metric refrigeration systems.
If the wrong standard is written on the purchase order, the result can be costly: inch tubes arrive where metric fittings are waiting, R220 temper is confused with soft annealed coil, or the inspection document does not match what customs, consultants or project engineers require.
ASTM B280 copper tube is widely used in the United States, Canada, Gulf countries and other inch-size HVACR markets. It covers seamless copper tube for air-conditioning and refrigeration field service, including repair, connection and installation work.
Typical ASTM B280 products include:
Soft annealed pancake coil
Straight length copper tube
ACR copper coil for refrigeration lines
Copper tube for flared or brazed joints
C12200 copper tube for HVACR systems
ASTM B280 sizes are usually ordered by inch outside diameter, such as 1/4", 3/8", 1/2", 5/8", 3/4" and 7/8". This makes it the preferred standard when your local fittings, valves and installation tools are inch-based.
EN 12735 copper tube is commonly used in Europe, the UK and other metric-size HVACR markets. It is the European standard for seamless round copper tubes used in air conditioning and refrigeration.
EN 12735 is usually divided into two important parts:
EN 12735-1: copper tubes for field piping systems
EN 12735-2: copper tubes for equipment, such as chillers, condensers, evaporators and heat exchangers
In EN language, the common material is Cu-DHP / CW024A, which corresponds closely to C12200 in ASTM language. You can learn more about C12200 copper material in our related guide.
Common EN 12735 sizes include 6mm, 8mm, 10mm, 12mm, 15mm, 18mm, 22mm and 28mm. These metric dimensions should not be mixed with inch fittings unless your engineer confirms compatibility.
H2: ASTM B280 vs EN 12735: Main Differences for Buyers
| Comparison Point | ASTM B280 Copper Tube | EN 12735 Copper Tube |
|---|---|---|
| Main Market | USA, Canada, Gulf, inch-size markets | EU, UK, metric-size markets |
| Size System | Inch sizes | Metric sizes |
| Common Material | C12200 | Cu-DHP / CW024A |
| Common Temper | O60 soft annealed, H58 hard drawn | R220 annealed, R250 half-hard, R290 hard |
| Product Forms | Pancake coil, straight length | Pancake coil, LWC, straight length |
| Application | Field service, HVACR installation | Field piping and OEM equipment |
| Documents | Mill test report | EN 10204 3.1 certificate often required |
The first and most common mistake is size conversion.
ASTM B280 uses inch sizes such as 3/8", 1/2" and 5/8". EN 12735 uses metric sizes such as 10mm, 12mm and 15mm. Although some sizes look close, they are not always interchangeable.
For example, 3/8" copper tube is 9.52mm outside diameter. It is not the same as 10mm copper tube. If your project uses 10mm metric fittings, ordering 3/8" ASTM B280 tube may cause leakage, fitting mismatch or installation delay.
Destination market
Copper tube outside diameter
Wall thickness
Fitting standard
Coil or straight length requirement
Temper is another area where buyers often make mistakes.
ASTM B280 usually describes temper by manufacturing condition, such as soft annealed or hard drawn. EN 12735 uses tensile-strength-based designations such as R220, R250 and R290.
For practical purchasing:
Soft annealed / R220 is suitable for pancake coil and easy bending.
Half-hard / R250 is used when better shape stability is needed.
Hard drawn / R290 is usually supplied as straight length copper tube.
For ACR copper tube, internal cleanliness is critical. Copper tube used for refrigeration systems must have a clean inner surface because oil residue, carbon residue or moisture may affect refrigerant performance.
This is especially important for modern refrigerants and compressor oils, including R410A, R32, R290, R600a and other HVACR applications.
For EN 12735 copper tube, many European buyers request EN 10204 3.1 inspection certificates. Tube marking may include standard number, size, material, temper and manufacturer identification.
For ASTM B280 copper tube, buyers often request mill test reports, material certificates and packing labels showing size, coil weight, standard and batch number.
A reliable ACR copper tube manufacturer should provide traceability from raw material to finished coil, including:
Material grade
Chemical composition
Mechanical properties
Size inspection
Eddy current testing if required
Packing list and batch number
Certificate matching the ordered standard
| Your Market or Project | Recommended Standard |
|---|---|
| USA, Canada, inch HVACR market | ASTM B280 |
| Gulf market with inch fittings | ASTM B280 |
| EU or UK refrigeration project | EN 12735-1 |
| OEM heat exchanger or chiller exported to Europe | EN 12735-2 |
| Metric installation market | EN 12735 |
| Unclear project requirement | Confirm destination, fitting size and inspection document first |
Can One Manufacturer Supply Both ASTM B280 and EN 12735?
Yes. A capable China ACR copper tube manufacturer can produce both ASTM B280 and EN 12735 copper tubes, because the production route is similar: casting, extrusion, drawing, annealing, cleaning, testing and packing.
What changes are the drawing dies, dimensional tolerance, temper target, marking, test report and certificate format.
Fengdie supplies ACR copper tube in pancake coil, level wound coil and straight length forms. Available options include C12200, Cu-DHP, soft annealed coil, R220 temper, R250 half-hard tube and R290 hard drawn straight copper tube.
Is ASTM B280 the same as EN 12735?
No. Both are used for air conditioning and refrigeration copper tube, but ASTM B280 is mainly inch-based while EN 12735 is mainly metric-based. They also use different temper names and document requirements.
Is C12200 the same as Cu-DHP?
They are closely related phosphorus-deoxidized copper grades used for ACR copper tube. ASTM commonly uses C12200, while EN commonly uses Cu-DHP / CW024A.
Can I use EN 1057 instead of EN 12735?
Usually no. EN 1057 is more related to plumbing applications, while EN 12735 is for air conditioning and refrigeration copper tubes. For refrigerant service, order EN 12735 copper tube.
What is pancake coil copper tube?
Pancake coil is soft annealed copper tube supplied in flat coils. It is widely used for HVACR installation, refrigeration lines, split air conditioners and field service work.
Should ACR copper tube be nitrogen sealed?
For refrigeration service, degreased, capped and nitrogen-sealed copper tube is strongly recommended. It helps protect the inner surface from moisture and contamination before installation.
