Solder Bar Manufacturer & Supplier in India

In the Indian trade the words overlap, and that confuses buyers. IS 193 itself says soft solder is supplied as sticks, ingots and other forms such as bars, so none of the words is wrong. The useful split is not physics, it is who or what feeds the metal.

• Solder bar — a heavy, flux-free cast piece dropped or auto-fed into a machine's melt pot. Nobody hand-holds a bar to a joint. This is the form for wave, selective, dip, HASL and large tinning baths.
• Solder stick — the same family of alloy in a smaller, hand-sized flux-free piece, picked up by a person and fed into a flame, a heavy iron or a small bench pot.
• Solder wire — thin, coiled and usually flux-cored, for hand and robotic tip soldering where the flux has to travel with the solder.

Need smaller hand-fed pieces for workshop, tinning, radiator or repair work? See our solder sticks. Looking for coiled flux-cored wire instead? See our solder wire.

Dross is the cost line nobody prints on a website and every production head is measured on. It is the oxide skin that forms the instant molten solder meets air, and a wave is an oxide-generating machine by design: the pump agitates the surface, the wave breaks, and oxide is folded back down into the metal instead of sitting quietly on top. That is why a pot that is skimmed clean in the morning is drossing again by mid-shift.

Lead-free makes it worse, honestly and predictably. A lead-free bath runs hotter and tin oxidises faster than a tin-lead alloy at its lower working temperature, so the same line will typically throw more dross after a changeover than it did before. That is chemistry, not a supplier defect — but the solder you charge the pot with decides how much worse it gets.

Why "virgin metal" alone does not guarantee low dross

This is the part most suppliers skip. Purity of the incoming metal is necessary but not sufficient. If the alloying and casting process entraps oxide while the bar is being made, those suspended oxides go into your pot with the bar and start seeding dross the moment they hit the melt. A well-processed bar and a badly-processed bar can carry an identical assay on paper and behave completely differently in the bath. So the honest question to put to any solder bar supplier is not "is it virgin metal" but "how do you melt and cast it" — and only a manufacturer can answer that. ACE Power Systems melts, alloys and casts in-house, which is precisely why we can be asked.

The impurities that change how a pot behaves

• Copper — picked up continuously from boards and leads. Past roughly 0.1 percent in a tin-lead bath it brings sludge, dull gritty joints, poor drainage and nozzle problems.
• Iron — very small quantities, of the order of 0.002 percent, are enough to push dross formation up and fluidity down.
• Cadmium — around 0.002 percent begins affecting joint formation; near 0.005 percent it brings bridging, icicling and weaker joints.
• Antimony — a deliberate strengthener in antimonial grades, but an unwanted trace in electronics alloys where it can accelerate copper dissolution.
• Aluminium and zinc — the classic poisons. Even traces wreck wetting and leave gritty, dull joints.

IS 193 puts numbers on the ceilings for soft solder supplied in India: arsenic 0.05 percent maximum, iron 0.02 percent maximum, copper 0.05 percent maximum, with aluminium, zinc and cadmium not to be present in amounts that injuriously affect the properties, and a tin tolerance of plus or minus 0.5 percent on the nominal grade. If your specification is written to IS 193 or to J-STD-006 practice, send it with your enquiry rather than only a trade name, and we will come back to you against it. Send your grade and your monthly consumption and you will get a like-for-like quote, not a headline number.