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Weldability SIFCUPRON NO. 17 Copper Phosphorus Brazing Rods



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Sifcupron No17 is a free-flowing copper phosphorus alloy rod, containing a nominal 7% phosphorus. It’s good electrical conductivity and corrosion resistance make it ideal for copper tubing, switchgear, motors etc. When brazing copper it has a self-fluxing capability.



Suitable for use in heating and ventilation industries, shipbuilding, and offshore processes and industries. It offers a low level of ductility, so is not suitable for applications where vibration or deformation are likely.

This high quality copper-phosphorous alloy rod has a low melting point and is ideal for brazing joints in non ferrous metals, such as copper, brass, and bronze. It is self fluxing on copper but Sifsilcopper flux is required when used to join brass, or brass to copper.  Not suitable to braze iron-containing materials like carbon or stainless steels or nickel containing materials.

For use with:

  • Gas brazing
  • Oxy acetylene
  • Oxy propane



Diameter 1kg Packet 2.5kg Carton 5kg Carton
1.5mm RO171501 RO171525 RO171550
2.4mm RO172401 RO172425 RO172450
3.2mm RO173201 RO173225 RO173250


Additional information

Weldability SIF


1kg, 2.5KG, 5KG


1.5mm, 2.4mm, 3.2mm


Click and Collect:
Free Click and Collect with no minimum spend from our warehouse on the Empress Park, Southampton with on-site parking. Once your order has been processed, we will advise you when it is ready for pickup.  Just want advice?  No problem.  Feel free to call in to speak to one of our friendly experts.

EWS Fleet Coverage Areas: 
Southampton | Eastleigh | Winchester | Alton | Farnham | Petersfield | Havant | Hayling Island | Waterlooville | Fareham | Portsmouth | Gosport | Chichester | Arun | Worthing | New Forest | Christchurch | Salisbury | Wiltshire | Test Valley | Basingstoke and Deane | West Berkshire | Reading | Hart | Waverley | East Hampshire | East Dorset | Hampshire | Bournemouth | Poole | Lymington | Ringwood | Verwood | East Preston | Goring-by-Sea | Lancing | Shoreham-by-Sea | Steyning | Bramber | Horsham | Adur

Nationwide Delivery (all items excluding gas cylinders):
Free UK mainland (England, Scotland and Wales) delivery on orders over £85 inc. VAT.
UK mainland delivery is £7.50 inc. VAT on orders under £85 inc. VAT.
UK islands and Northern Ireland shipping costs may vary.

UK Delivery for Gas Cylinders:
Shipping costs for gas cylinders are calculated at checkout once the delivery postcode is entered.

International Delivery:
Please contact us for an accurate delivery quote.


Typical Weld Metal Composition

P 7%
Cu Balance

Typical Mechanical Properties

Melting Point 705-800°C
Ult Tensile Strength 500 N/mm²
Hardness 200


  • EN 1044: CP201
  • BS 1845: CP3
  • DIN8513: L-Cu7P
Weldability SIFCUPRON NO. 17

Weldability SIFCUPRON NO. 17 Copper Phosphorus Brazing Rods

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