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Solder Wire

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Pliny’s Ancient Solder

Roman writer Pliny the Elder described lead-tin solders almost two thousand years ago, including a two-to-one lead-tin mix called tertiarium. Roman plumbers used such alloys on pipe seams. The English word solder itself comes from the Latin solidare, meaning to make solid.

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Solder Wire.

Solder wire is a metal alloy drawn into wire that melts at a low temperature and joins electrical and metal parts. It is supplied either as solid wire or with a flux core. The flux cleans oxide from the surfaces as the solder melts, so the alloy wets properly and forms a sound joint.

SMARTE VENTURES PVT LTD (formerly Shree Madhav Agencies Pvt. Ltd.) manufactures solder wire from high-grade virgin metals. The solder business descends from our founder company, Shree Smelting, a 45-year name in tin and lead products. We supply the following types.

Product Types

Rosin core solder wire

Wire with a continuous flux core. It is supplied in rosin-activated and urea-based flux types, in various diameters from 12 to 22 SWG. Flux grades include:

  • RMA-1: Low halide content (0.5% max.), non-corrosive activated flux. Used in electronic equipment such as televisions, telecommunications and computers.
  • RMA-2: Higher halide content (1% max.). Suited to difficult surfaces and mass-production items such as lamps, capacitors and fuses.
  • RMA-3: Mild activity, free of halogen-based activators. Used in defence electronics and avionics.
No-clean solder wire

Non-corrosive, resin-based flux with low-to-medium residue that is electrically safe and does not need cleaning in most uses. It is compatible with lead-free alloys. Where cleaning is wanted, residue can be removed with isopropyl alcohol or methylated spirit.

Lead-free and RoHS-compliant solder

Lead-free solder alloys and RoHS-compliant solder, For products sold into markets with restrictions on lead.

Solid solder wire

Solder without flux, made from high-purity metals in the required tin/lead compositions and gauges.

Other types
  • Corrosive acid-core solder wire: For metal fabrication such as radiators and tin containers, and for soldering fuse wire to detonators. It replaces zinc chloride fluxes.
  • Water-soluble flux-cored wire: Used in telecommunication equipment. The flux is corrosive and must be cleaned with deionised water.
  • Silver solder: In the 62/36/2 grade (Sn/Pb/Ag).

Other forms: Solder paste and solder sticks, as listed in the brochure.

Product USP / Benefits

  • High-grade virgin metals and analytical quality control at every production step.
  • Full flux range: RMA-1, RMA-2, RMA-3, no-clean, water-soluble, acid-core, rosin-activated and urea-based.
  • Wide alloy range: Ten tin-lead and tin-lead-silver/bismuth compositions with published melting points (see Section F).
  • Lead-free and RoHS-compliant options for Regulated export markets.
  • Gauge range: 12 to 22 SWG, with different combinations of tin, lead, silver, cadmium and antimony.
  • Built to the customer’s standard: Supplied to relevant Indian and international standards.
  • Several forms: Wire, paste and sticks.
  • Skilled technical team checking quality and reliability, including of rosin core and lead-free wire.
  • Heritage: Tin and lead expertise from Shree Smelting.

Certifications & Standards

  • RoHS: RoHS-compliant solder and lead-free alloys are offered.
  • Flux classification: RMA (rosin mildly activated) grades 1, 2 and 3.
  • Company-level certifications (not product-specific): ISO 9001:2015, ISO 14001, CE, RoHS compliant.

The brochure names no specific solder standard (such as J-STD-006 or IS 1819), so none is claimed.

TECHNICAL SPECIFICATIONS
Technical Parameter Specification Profile & Range
Material Base High-purity Tin-Lead (Sn-Pb), Lead-Free Eco Alloys, and Silver-Infused grades
Flux Core Distribution Uniformly integrated Single, Three, or Five internal rosin cores
Physical Geometry Continuous spool wires across multiple industrial SWG gauges, thick bars, or plates
Compliance Baseline Manufactured to align with strict B2B quality expectations, ISI guidance, and RoHS requirements

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