IS 440:2020 is the Indian Standard (BIS) for flux cored solder wire. IS 440 covers flux-cored solder wire for electronic and electrical soldering. Covers both traditional tin-lead (Sn63/Pb37) and modern lead-free (SAC305) formulations. The flux core provides cleaning action during soldering.
Specification for flux-cored solder wire used for soldering electronic, electrical, and plumbing joints.
Overview
Status Current
Usage level Specialized
Domain MEP — Electrical Installations
Type Specification International equivalents
Also on InfraLens for IS 440
Practical Notes
! Sn63/Pb37 is the eutectic composition — sharpest melting point, best for hand soldering.
! Lead-free solder (SAC305) is mandatory for EU (RoHS) export products. Use for new electronics designs.
! Flux residue from rosin-core solder is non-corrosive and can be left on. Acid-core flux must be cleaned.
Frequently referenced clauses
Cl. 4 — Alloy compositions (Sn60/Pb40, Sn63/Pb37, lead-free SAC305)
Cl. 5 — Flux types and content
Cl. 6 — Wetting test
Cl. 7 — Dimensional requirements
solder flux cored soldering wire tin lead lead free solder electronics
International Equivalents Similar International Standards
IPC J-STD-004B IPC (US)
Medium Current
Requirements for Soldering Fluxes
IPC covers flux classification. For solder alloy, IPC J-STD-006 applies.
Key Differences
≠ IS 440 covers both solder alloy and flux in one standard. IPC has separate standards for each.
Key Similarities
≈ Sn63/Pb37 and SAC305 are internationally standardized compositions used worldwide.
Parameter Comparison
Parameter IS Value International Source
⚠ Verify details from original standards before use Report Error
Key Values3 Quick Reference Values
Sn63/Pb37 melting point 183°C
SAC305 (lead-free) melting 217-220°C
Common diameters 0.5, 0.8, 1.0, 1.2mm
Tables & Referenced Sections Key Tables
Table 1 — Solder alloy compositions
Table 2 — Flux requirements
Frequently Asked Questions1 What solder to use for electronics? + Sn63/Pb37 with rosin flux for general electronics (best wetting). SAC305 (Sn96.5/Ag3.0/Cu0.5) lead-free for RoHS-compliant products.
QA/QC Inspection Templates 📋
QA/QC templates coming soon for this code.