SIF SIFMIG 985 Copper MIG Brazing Wire - CuSn1 - 0.8/1.0/1.2mm Dia. (4kg & 12.5kg Spools)
- CuSn1 copper MIG wire containing minimum 98.5% copper
- Available in multiple diameters on 4kg and 12.5kg spools
- Tensile strength 220 N/mm², hardness 70 BHN, melting point 1025°C
- Requires argon shielding gas and DC+ current
- Suitable for oxygen-bearing copper joints and fabrication work

SIFMIG 985 is a CuSn1 copper MIG wire (98.5% copper) for welding oxygen-bearing copper joints and copper materials, supplied in 0.8–1.2mm diameters on 4kg and 12.5kg spools.
SIFMIG 985 is a high-quality copper MIG wire containing a minimum of 98.5% copper with deoxidising elements, providing excellent resistance to high temperatures and corrosion.
It is designed for MIG welding of copper and is especially suitable for joint welding of oxygen-bearing copper materials.
When welding thicknesses above 6mm, preheating to 600°C is recommended along with controlled cooling to reduce the risk of cracking.
The wire produces weld metal with a tensile strength of 220 N/mm², hardness of 70 BHN, and melting point of 1025°C.
It operates on DC+ with argon shielding gas and is available in 0.8mm, 1.0mm and 1.2mm diameters on 4kg and 12.5kg spools for fabrication, repair and maintenance work.
| Wire Diameter | 0.8mm | 1.0mm | 1.2mm |
| Spool Size | 4kg | 12.5kg |
| Material | Copper MIG Wire (CuSn1, ≥98.5% Copper) |
| Welding Positions | All Positions |
| Shielding Gas | Argon |
| Current | DC+ |
Applications
- MIG Welding of Copper
- Oxygen-Bearing Copper Joints
- Fabrication & Repair
| Tin (Sn) | 0.85% |
| Manganese (Mn) | 0.25% |
| Silicon (Si) | 0.2% |
| Phosphorus (P) | 0.01% |
| Copper (Cu) | Balance |
| Tensile Strength (UTS) | 220 N/mm² |
| Hardness | 70 BHN |
| Melting Point | 1025°C |
| Standards | EN ISO 24373 Cu 1898 (CuSn1) | BS 2901 C7 |
| Brand | Weldability Sif |
| shopping_price_ranges | 500 - 1000 |
| Material Type | Brazing (ERCu) |
| AWS Classification | CuSn1 |
| Spool Size | Small (2-7kg), Standard (12.5-25kg) |
| Diameter | 1.2mm · |
| Weight | 4kg · |
| SKU | Diameter | Weight | Stock Status | |
|---|---|---|---|---|
| WO980812 | 0 8mm | 12 5kg | In Stock | £294.30 ex VAT £353.16 inc VAT |
| WO980840 | 0 8mm | 4kg | Out of Stock | £73.58 ex VAT £88.30 inc VAT |
| WO981012 | 1 0mm | 12 5kg | In Stock | £210.00 ex VAT £252.00 inc VAT |
| WO981212 | 1 2mm | 12 5kg | Out of Stock | £206.95 ex VAT £248.34 inc VAT |
| WO981240 | 1 2mm | 4kg | In Stock | £106.03 ex VAT £127.24 inc VAT |
| WO981040 | 1 0mm | 4kg | In Stock | £122.30 ex VAT £146.76 inc VAT |
Product Information
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SIF SIFMIG 985 Copper MIG Brazing Wire - CuSn1 - 0.8/1.0/1.2mm Dia. (4kg & 12.5kg Spools) Get in touch
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