Resources

Helpful hints to clients

  • Red Solders
    • Keep solders in a sealed tiny container. Do not cut up in small tiny pieces. Roll as thin as possible
      Light sand paper before use, wipe clean with alcohol or acid
      Ensure the item being soldered is also clean
      Gentle heat when starting the soldering process and increase heat slowly

  • Alloying Tungsten & Zirconium
    • A controlled (oxygen free) environment is needed to be able to alloy this combination

  • Platinum Chains
    • Beware – these may not always be 95% purity – some countries work with 80% & 85% purity platinum

  • Nozzles of smelting equipment
    • To be cleaned regularly. A small particle of carbon can cause contamination.
      Using the incorrect crucible can also cause contamination

  • Solder lines appear when rhodium plating?
    • Caused if too much heat is applied when soldering – the solder line hence becomes porous and absorbs the cleaning solution

      Solution: Degrease again, steam, clean and re-plate

  • Brittle solder problems?
    • Anneal the solder

  • Silver solder
    • Hard solder to be used on the shank or thicker parts
      Easy & Medium solder to be used on thinner parts

  • Problems soldering 1600 solder onto a Platinum ring?
    • Fuse the shank so no solder is required

  • 18ct Red Gold cracking?
    • Pour almost to exact size. Roll to almost exact height – do not anneal
      Anneal just before correct height then roll to spec

  • 9ct Bench Gold going red?
    • Too much heat is being applied and is burning out the zinc

  • Aqua Regia can be used to etch on jewellery
    • Mask & gloves MUST be worn when working with this
      The longer it is left on the metal the darker the mark and deeper it will penetrate the metal

orders@capepreciousmetals.co.za

DUE TO SECURITY REASONS,
ALL VISITORS TO MAKE
AN APPOINTMENT BEFORE
VISITING OUR OFFICES

HEAD OFFICE:

(servicing Western Cape & Namibia)
TEL: +27 (0)21 551 2066
FAX: +27 (0)21 552 7792

CPM Building
Link Close
Montague Gardens
7441

JOHANNESBURG:

(servicing Gauteng, Northern
Provinces & Botswana)
TEL: +27 (0)11 334 6263
FAX: +27 (0)11 334 6947

Unit 32
3 Sunrock Close
Sunnyrock Park
Germiston

DURBAN:

(servicing KwaZulu-Natal,
Free State & Northern Cape)
TEL:+ 27 (0)31 303 5402
FAX: +27 (0)31 303 5403

Unit 9, Cypress Park
19 Cypress Drive
Glen Anil
4051

PORT ELIZABETH:

(servicing Eastern Cape)
TEL: +27 (0)41 365 1890
FAX: +27 (0)41 365 1901


88 Hurd Street
Newton Park
6045

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