Overheating of investment above 700ºC, disintegrates the investment, liberating Sulphur or Sulphur compounds. These combine in metal in the gold alloy & form sulphide film. This gives a dark casting (Black casting) which cannot be cleaned by pickling.
Vulcanizing Press Machine
Vulcanizing Press Machine Manufacturers
Vulcanizing Press Machine Suppliers
Vulcanizing Press Machine Exportrs
Our Network In UAE,
Dubai, Sharjah, Abu Dhabi, Jordan, Qatar, Kuwait, Lebanon, Oman, Israel, Egypt, Doha, Umm Al Quwain, Ras Al Khaimah, Fujairah, Riyadh, Muscat, Baghdad, Cairo, Amman, Beirat, Manama, Sana'n, Jerusalem, Iran, Iraq, Uae, Saudi Arabia, Yemen, Behran, Ajman, Tehran.