For buyers of C12200 (DHP, deoxidized high-phosphorus copper), the LME ticker is only the starting layer of the invoice. What makes DHP pricing its own story in September 2026 is what is happening downstream: air-conditioner production is set to swing from an 8% year-on-year contraction this month to a 17% year-on-year expansion by November, pulling the largest single demand channel for C12200 seamless ACR tube sharply higher.
What C12200 Actually Is
C12200 is the unified numbering system (UNS) designation for Deoxidized High-Phosphorus Copper (DHP), the standard alloy for copper tube used in air conditioning, refrigeration, plumbing, heat exchangers, and brazed assemblies. Phosphorus, controlled between 0.015% and 0.040%, is added during the melt to chemically combine with the residual oxygen left over from refining. The result is oxygen content below roughly 10 ppm (parts per million), compared with 200–400 ppm in C11000.
That single difference - driving oxygen from a few hundred parts per million to under ten - is the reason C12200 exists as a separate grade. When a C11000 tube is heated in a brazing furnace, the residual oxygen reacts with hydrogen from the flame or atmosphere to form water vapor at the grain boundary. The pressure of that steam produces micro-fissures and "blistering" - the failure mode known as hydrogen embrittlement. C12200 eliminates the oxygen in advance, so the steam never forms, and the joint stays leak-tight. The same chemistry is what gives C12200 its clean interior surfaces and the repeatable braze-joint integrity that refrigeration system manufacturers require.
C12200 corresponds to:
UNS C12200 (USA)
EN CW024A / Cu-DHP (Europe)
JIS C1220 (Japan)
GB TP2 (China)
A drawing that calls for C12200, Cu-DHP, C1220, or TP2 is asking for the same alloy. The mill test certificate should confirm phosphorus content and oxygen content regardless of the label.
September 2026 Market Snapshot
| Indicator | Value | Note |
|---|---|---|
| LME 3-month copper (Sep 11 close) | $14,226 / tonne | -1.2% weekly, 10-week streak ended |
| LME intraday record (Sep 10) | $14,858.5 / tonne | New all-time high |
| LME cash vs 3-month | -$4.50 / tonne | First contango since late July |
| SHFE most-active (Sep 11 close) | 108,990 yuan / tonne | Weekly high 112,330, low 108,180 |
| SMM imported copper-concentrate index (weekly) | -$209.7 / dmt | Smelter margins further squeezed |
| LME on-warrant stocks | ~117,600 tonnes | Unchanged on the week |
| SHFE stocks | 54,780 tonnes | -13% WoW, lowest since January 2024 |
| SMM national mainstream copper inventory | ~87,500 tonnes | -1,400 WoW |
| COMEX–LME spread (Sep contract) | -$12.86 / tonne | Collapsed from +$135.1 on Sep 8 |
| US August CPI (released Sep 11) | Stronger than expected | Fed hike expectations re-priced |
The Story Of The Week: A New Record, Then A 3.6% Single-Day Reversal
Three drivers moved the LME copper tape in the same week:
Tariff-uncertainty cooling. Reports that the White House had not yet decided on cathode tariffs removed the immediate "rush cathode into the US" trade. COMEX–LME spread on the September contract collapsed from +$135.1 / tonne on September 8 to -$12.86 / tonne on September 11, closing the US-arbitrage window almost overnight.
Hawkish Fed re-pricing. The August US non-farm payrolls, released the previous Friday, came in far stronger than expected. Combined with strong August CPI on September 11, the market moved to price a higher probability of a Fed rate hike at the September 18 FOMC. A higher-rate path weighs on growth-sensitive metals.
Positioning correction. A long-running multi-week long position had grown overcrowded, and the tariff-uncertainty headline was the catalyst that triggered the unwind. By the close of Friday the LME cash-to-3-month spread had flipped into a $4.50 / tonne contango - the first time in roughly six weeks - indicating that near-term physical supply concerns were easing.
For C12200 buyers the implication is straightforward: the LME base cost layer in your September invoice is slightly lower than the layer you were hedging against a week ago, but the demand layer (ACR and heat-pump production) is firmly pointing the other way into Q4.
LME copper set a fresh all-time high in September 2026 (left). C12200's main demand channel - household AC production - is set to re-accelerate from an 8% YoY contraction in September to a 17% YoY expansion by November (right). Source: LME, public industry production-schedule data.
What C12200 Costs Above The LME Base
A C12200 invoice is built from the same three layers as any other copper product, but layer 3 - the conversion premium - is structured differently than for C11000.
| Pricing layer | C11000 / ETP tube | C12200 / DHP ACR tube |
|---|---|---|
| LME Grade A cathode (Sep 11) | $14,226 / tonne | $14,226 / tonne |
| Regional premium (Asia) | ~$40–50 / tonne | ~$40–50 / tonne |
| Conversion premium (indicative) | ~$700–1,200 / tonne | ~$1,400–2,500 / tonne |
| Bright-annealed surface + N2 purge + cleanliness | Not required | Required by ASTM B68 / B75 |
| Hydrostatic test (1.5× operating pressure) | Optional | Standard for ACR / heat-exchanger service |
| Phosphorus content verification | N/A | 0.015–0.040% per heat |
For seamless DHP ACR tube to ASTM B68 (the standard for air-conditioning and refrigeration service), the conversion premium is consistently higher than for C11000 plumbing or electrical tube, for three reasons:
Bright annealing. ASTM B68 specifies a clean, oxide-free internal surface - "no oxidation, no oil, no scale, suitable for direct brazing without pre-treatment." The annealing furnace has to be atmosphere-controlled, which is more capital-intensive than a standard anneal.
Tighter dimensional control. ACR tube runs tighter on OD and wall-tolerance than plumbing tube, because refrigerant and HVAC systems use compression fittings and tube-expansion joints that demand concentricity.
Mandatory pressure test and cleanliness verification. Hydrostatic testing at 1.5× operating pressure, eddy-current testing, and nitrogen purging of each tube are standard steps, not optional extras.
C12200's Demand Engine: Air-Conditioning Production Cycles
The single largest end-use for C12200 seamless tube is the residential and light-commercial air-conditioning industry. AC manufacturers use C12200 for:
Suction and liquid refrigerant lines
Indoor and outdoor coil headers
Heat-pump refrigerant circuits
Some brazed heat-exchanger tube bundles
September is the manufacturing trough month for AC producers in the Northern Hemisphere - they are transitioning from the spring-to-summer build into the Q4 export and indoor-unit cycle. Producer schedules for the September–November window are now expected to be -8%, +12%, and +17% year-on-year respectively. That swing from an 8-point contraction to a 17-point expansion in three months is unusually sharp and is the single most important demand signal for DHP tube buyers.
Three factors are driving the swing:
The end of the 2024 inventory destocking in Europe, where 2025 retail demand fell sharply;
A heat-pump subsidy push in several European and North American markets, which uses the same C12200 tube and shifts the demand mix toward heating-cycle systems;
The seasonal inventory rebuild for next spring's cooling season, which needs finished goods on retail shelves by April.
Why DHP Trades Differently From ETP
If you maintain a master procurement file for copper tube, you will see that C11000 ETP and C12200 DHP prices track the LME base very closely - but the spread between the two grades moves independently. The spread reflects three things:
Phosphorus-copper master alloy cost. A small but real input cost that doesn't move with the LME cathode ticker.
Brazing process compatibility. A part designed for C11000 cannot be assembled with hydrogen-flame brazing without risk of failure. If the customer's process mandates brazing, the substitution is engineering-impossible, and the DHP grade is non-substitutable.
Regulatory pressure on refrigerants. As the industry transitions to lower-GWP refrigerants, working pressures and operating temperatures change, which tends to favor DHP tube for new-generation systems.
When LME copper is at a record high, the phosphorus and processing-cost layer becomes a smaller share of the total invoice. When LME copper falls, the conversion-premium layer becomes a larger share, and the spread between C12200 and C11000 looks wider in dollar terms. This is why negotiating a fixed-dollar conversion premium - not a percentage of the LME - protects both sides through volatile periods.
Practical Tips For C12200 Procurement This Quarter
Confirm the grade, not just "copper tube." A drawing or PO that says "copper tube to EN 1057" allows C11000 or C12200. A drawing or PO that says "C12200 / Cu-DHP / TP2" pins the grade and excludes the wrong material.
Require the MTC, including O and P content. C12200 should ship with a mill test certificate that reports both oxygen (≤ 10 ppm typical) and phosphorus (0.015–0.040%). If the MTC doesn't show these, the material is not the grade you asked for.
Demand bright-annealed + N2 purged interior for ACR. ASTM B68 specifies both. If your part is going into a refrigeration or HVAC line, the cost difference between bright-annealed and standard-annealed is small relative to the warranty cost of a leaky joint.
Lock the conversion premium, float the LME. In a high-volatility LME environment, fixing the conversion premium and floating the LME reference is the cleanest pricing structure. It aligns the supplier's margin (premium) with the buyer's risk (LME).
Watch the September 30 tariff window. If a US cathode tariff is announced, COMEX-warehouse cathode will gain against LME again, and the US-domiciled fabrication of C12200 tube will be squeezed. A buyer shipping into the US should ask their supplier today about bonded-warehouse and origin-flex options.
Front-load Q4 orders before the AC build. Producer schedules show the production acceleration landing in October. Tube availability in November and December will be tighter than today. Buyers with predictable Q1 2027 demand should be placing orders now.
Our C12200 / DHP Product Range
We supply C12200 (Cu-DHP / TP2) in the form most frequently specified by HVAC, refrigeration, heat-pump, and brazed-heat-exchanger customers. Each product is produced to the relevant ASTM, EN, GB, or JIS standard and ships with a full mill test certificate confirming chemical composition, mechanical properties, and pressure-test results.
| Product | Standard sizes | Temper | Standards |
|---|---|---|---|
| Seamless ACR tube (air-conditioning & refrigeration) | OD 3–22 mm, wall 0.4–2.0 mm | O60 (soft annealed), R220, R250 | ASTM B68, B75, B280; EN 12735; JIS H3300; GB/T 17791 |
| Seamless water / gas / plumbing tube | OD 6–159 mm, wall 0.6–6.0 mm | O60, R220, R250 | ASTM B88, B306; EN 1057; GB/T 18033 |
| Heat-exchanger tube (C12200 / C44300 / C70600) | OD 6–57 mm, wall 0.4–4.0 mm | O60, H55 | ASTM B111, B359, B543; EN 12451 |
| Pancake coil (continuous length, soft-annealed) | OD 3.2–19.05 mm, up to 100 m coils | O60 | ASTM B280 |
We also supply C11000 (ETP) for parts where the assembly process does not require deoxidation, and C12000 / C12100 for higher-conductivity-with-some-deoxidation applications.
Request a C12200 / DHP Quote
Send us your drawing, specification, target quantity and shipping destination. We will return a quote with the LME reference, regional premium, and DHP conversion premium itemized, together with a sample MTC for review.
