Standard Foil Calibration

Standard Foil Calibration
(IS 2984 — Reference Foil Thickness)

NABL-accredited calibration of standard foils (reference shims) used to calibrate coating thickness gauges, DFT probes and surface gap instruments in construction testing.

Overview

What is the Standard Foil Calibration?

Standard Foils are precision reference thickness standards used to calibrate coating thickness gauges (Elcometer, PosiTector), magnetic flux gauges and optical profilometers. Used in construction for DFT gauges verifying epoxy coating, polyethylene coating and Galva Pulse instruments.

At Global Lab, standard foil calibration uses a calibrated anvil micrometer with flat measuring faces to measure foil thickness at 5 positions — centre and four quadrants. Mean, maximum, minimum and uniformity coefficient reported. Traceable to NPL India through certified reference gauge blocks.

Non-Destructive

Minimal surface preparation. Structure integrity is preserved throughout testing.

Fast Turnaround

On-site results within hours. Digital reports dispatched within 24 hours.

NABL Certified

All test and calibration results are backed by traceable measurements and standardized procedures.

Pan-India Coverage

Site engineers deployed across 7 lab locations and all major project sites.

Digital Reporting

Access reports anytime via Autovity QLMS client dashboard — zero paperwork.

High Accuracy

Results correlated to cube compressive strength with ±2% precision range.

Test in Action

Standard Foil Calibration — Site Images

Standard Foil Measured at 5 Positions with Flat-Anvil Micrometer

5-Point Thickness Map for Uniformity Assessment

NABL Certificate Used for DFT Gauge Calibration Traceability

Test Procedure

How the Standard Foil Calibration is Conducted

1

Surface Preparation

A shallow groove (approx. 25mm deep) is cut into the concrete surface using a diamond-tipped cutting tool. The surface is cleaned of dust and debris.
2

Insert Disc Placement

A specially designed steel insert disc is placed into the groove. A thin rod connects the disc to the pullout apparatus above the surface.
3

Hydraulic Pullout Force Application

A hydraulic jack applies a steady, controlled pullout force to the insert disc via the reaction ring resting on the concrete surface.
4

Failure Load Recording

The maximum force at which the concrete cone is extracted is recorded. A digital load indicator provides real-time readings with data logging.
5

Strength Calculation & Reporting

The pullout force is correlated to cube compressive strength using established calibration curves. NABL-accredited reports are issued via Autovity QLMS.

Standards & Specifications

Applicable Test Standards

Standard	Title	Scope	Type
IS 2984	Gauge Blocks — applicable to reference foil measurement	Foil Reference	Indian Standard
ISO 3650	Geometrical Product Specifications — Gauge Blocks	Reference Blocks	ISO
IS 1832	Outside Micrometers	Micrometer Reference	Indian Standard
NABL-141	NABL Policy on Metrological Traceability	Traceability	NABL

Applications

Where is the Standard Foil Calibration Used?

DFT gauge standard foil calibration for coating verification

Elcometer and PosiTector calibration reference foils

Galva Pulse instrument standard foil calibration

Epoxy and polyethylene coating reference foils

Polymer film thickness testing reference foils

Annual coating gauge reference standard calibration

Why Choose Global Lab

Our Advantages

NABL Accredited CertificatesReference foil certificates for DFT gauge traceability.

5-Point UniformityFoil uniformity documented — worn foils identified.

25–2000μm CapabilityWide range from thin film to thick coating foils.

Fast 1-Day CertificateCertificate within 1 working day.

Pan-India CoverageDimensional calibration at all 7 locations.

DFT Gauge VerificationCalibrated foils used to verify PosiTector/Elcometer in same visit.

Standard Foil Calibration(IS 2984 — Reference Foil Thickness)