Binding Wire Testing

Binding Wire Testing
(IS 280 — Mild Steel Wire)

Mechanical testing of mild steel binding wire — verifying tensile strength, elongation, ductility (wrapping test) and dimensional accuracy per IS 280 for use in reinforcement bar tying and construction applications.

Overview

What is the Binding Wire Testing?

Binding Wire (IS 280 mild steel wire) is used extensively on construction sites for tying reinforcement bars at intersections and holding cage assemblies together. Though not a structural element, inadequate quality binding wire can snap during tying — slowing construction and potentially affecting reinforcement positioning before concreting.

At Global Lab, binding wire testing per IS 280 covers tensile strength (minimum 340 MPa for Grade 1), elongation at break, ductility (wrapping test — wire wound around its own diameter without cracking), diameter measurement and mass per unit length verification — all mandatory parameters per IS 280.

IS 280 Grade 1 Testing

All mandatory tests per IS 280 for mild steel binding wire.

Tensile Strength ≥340 MPa

IS 280 Grade 1 minimum tensile strength verified by UTM.

Wrapping Ductility Test

Wire wound around its own diameter — must not crack per IS 280.

Diameter Measurement

Wire diameter and mass/metre measured vs IS 280 standard sizes.

NABL Certified Reports

All results on NABL-accredited letterhead per IS 280.

All Wire Gauges

16, 18, 20 and 22 gauge binding wire all tested.

Test in Action

Binding Wire Testing — Site Images

Binding Wire Diameter Measurement

Tensile Test in Calibrated UTM

Wrapping Test Around Own Diameter

Test Procedure

How the Binding Wire Testing is Conducted

1

Sample Collection

Wire samples collected from coils per IS 280 sampling procedure.
2

Diameter & Mass

Wire diameter measured at 5 points. Mass per metre calculated from weighed length.
3

Tensile Test

Wire gripped in NABL-calibrated UTM. Tensile strength and elongation measured.
4

Wrapping Test

Wire wound tightly around its own diameter for 8 turns. Inspected for cracks.
5

IS 280 Compliance Report

All results vs IS 280 Grade 1 requirements. NABL report within 3 days.

Standards & Specifications

Applicable Test Standards

Standard	Title	Scope	Type
IS 280	Mild Steel Wire for General Engineering Purposes — Specification	Binding Wire	Indian Standard
IS 1608	Method for Tensile Testing of Steel Products	Tensile Test	Indian Standard
IS 7887	Methods for Wrapping Test for Wire	Wrapping Test	Indian Standard
ASTM A853	Standard Specification for Steel Wire, Plain for Concrete Reinforcement	Wire Standard	ASTM

Applications

Where is the CAPO Test Used?

Incoming quality control of binding wire at construction sites

Large infrastructure project binding wire procurement quality verification

Third-party testing of binding wire from new or unknown suppliers

Government building project (CPWD, PWD) binding wire acceptance testing

Binding wire quality audit for precast concrete factory production

Galvanised binding wire mechanical property verification

Why Choose Global Lab

Our Advantages

NABL Accredited ReportsLegally valid IS 280 compliance certificates for site QC records.

Wrapping Test CapabilityDuctility wrapping test — ensures wire can be tied without snapping.

All Wire Gauges16, 18, 20 and 22 gauge tested — covers all construction site sizes.

Fast 3-Day ReportComplete IS 280 test suite within 3 working days.

Pan-India CoverageTesting at all 7 NABL-accredited lab locations.

Combined Wire PackageBinding wire + Rebar + Prestressed strand tested together.

Binding Wire Testing(IS 280 — Mild Steel Wire)