Chemical Analysis — Epoxy Coated Reinforcement Steel Bar(IS 13620:1993 · IS 1786:2008)
Base-steel chemical composition testing of fusion-bonded epoxy coated reinforcement bars per IS 13620:1993 and IS 1786:2008 — confirming the coated bar's underlying steel meets its declared grade.
What is Epoxy Coated Rebar Chemical Analysis?
Fusion-bonded epoxy coated reinforcement bars combine the base TMT bar (to IS 1786:2008) with a 0.1–0.3 mm electrostatically applied epoxy layer per IS 13620:1993, providing corrosion resistance in marine, coastal and chemically aggressive environments. The coating specification governs film thickness, adhesion and pinhole-defect limits, but the underlying steel must still independently meet its declared grade's chemical composition.
Global Lab verifies the base-steel chemistry beneath the coating using OES per IS 228 methods — a small coated area is carefully removed to expose bare steel for spark analysis without disturbing the surrounding coating integrity — reporting carbon, manganese, sulphur, phosphorus and carbon equivalent against IS 1786:2008 limits for the declared grade.
Chemical Analysis — Epoxy Coated Reinforcement Steel Bar — Site Images
How the Chemical Analysis — Epoxy Coated Reinforcement Steel Bar is Conducted
- 1
Sample Selection
A representative coated bar section is sampled, with coating batch and thickness records reviewed alongside the declared base-steel grade. - 2
Localized Coating Removal
A small area of epoxy coating is carefully removed to expose bare base steel for spectral analysis, without disturbing the surrounding coating integrity. - 3
OES Spark Analysis
Optical Emission Spectroscopy determines carbon, manganese, sulphur, phosphorus and silicon on the exposed base steel, calibrated against certified reference material. - 4
Carbon Equivalent Calculation
Carbon equivalent is calculated and checked against the IS 1786:2008 limit for the declared grade. - 5
Reporting
Base-steel composition and CE are compiled into a NABL-accredited report confirming grade compliance, issued via Autovity QLMS.
Applicable Test Standards
| Standard | Title | Scope | Type |
|---|---|---|---|
| IS 13620:1993 | Fusion Bonded Epoxy Coated Reinforcing Bars — Specification | Coating Thickness, Adhesion & Application | Indian Standard |
| IS 1786:2008 | High Strength Deformed Steel Bars — Specification | Base-Steel Chemical Composition | Indian Standard |
| IS 228 (Various Parts) | Methods for Chemical Analysis of Steels | Elemental Analysis Methods | Indian Standard |