Lead-free solder alloys have been around for as long as people have done soldering, with sources dating back about 5,000 years. Most of these alloys were combinations like copper-silver or silver ...

Such are the general conditions which should be followed in making alloys. Copper melts at 1920 Fah. ; zinc at 700 Fah. ; lead at 590 Fah. ; tin at 450 Fah. ; cast-iron at 2100 Fah. A dull red ...

THE London Metal Exchange (LME) has approved Hong Kong as an LME delivery point and the listing will become active three months after the first warehouse company has been approved, it said on Monday ...

These alloys are usually formed by mixing sulfur, copper, silver, and lead. The whole design is set against a gilded back panel. The animal used as a subject in the brooch has been identified as a ...