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Pull-Off Adhesion Strength Test of Plaster.

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In-situ evaluation of bond strength between plaster and substrate using controlled tensile loading

The Pull-Off Adhesion Strength Test is an in-situ method used to determine the bond strength of plaster, render, mortar, repair materials, coatings, or overlays applied on concrete or masonry substrates. The test uses a bond testing machine to apply a direct tensile load on a metal dolly glued to the plaster surface until failure occurs. The force required to detach the material indicates the adhesion strength, which is critical for verifying workmanship quality and long-term durability. This test is widely required for quality assurance, repair validation, and acceptance criteria on construction sites.

Why Pull-Off Adhesion test of PlasterMatters.

Determines Actual Bond Strength Between Plaster and Substrate

Poor adhesion leads to: Peeling Debonding Delamination Early failure of plaster Measuring pull-off strength ensures the plaster layer has bonded properly and can withstand service conditions.

Identifies Workmanship & Material Quality Issues Early

Low adhesion may indicate: Insufficient surface preparation Dust, laitance, or curing issues Improper mortar mix Poor application technique This test helps identify such issues before they turn into major repair costs.

Ensures Compliance with IS & Project Specifications

Adhesion requirements are often specified by: IS 17149 – Adhesion Test Methodology IS 9103 / IS 2645 – Guidelines for admixtures and waterproof coatings Manufacturer datasheets Consultant-defined acceptance criteria Pull-off testing provides traceable numerical values to confirm compliance.

Supports Safe, Durable & Long-Lasting Plaster Systems

Reliable adhesion reduces chances of: Cracks Hollow areas Water ingress Weak spots under tile or paint Premature failure This leads to safer, more durable walls and ceilings across residential, commercial, and industrial structures.

NDT TESTING

GL Advantages.

Accredited Facility: NABL-accredited laboratory with traceable calibration and stringent Quality System procedures.

Compliance with Standards: Tests conducted in accordance with relevant IS/ASTM/RILEM/EN standards.

Experienced Personnel: Technologists and experts who interpret results and recommend mitigation strategies.

Rapid and Reliable Reporting: Valid reports that comply with relevant standards.

Testing Capabilities: Lab and on-site testing, along with post-test consulting services.

Global Lab Advantage.

Accredited facility.
Standards compliance.
Experienced analysts.
Fast, reliable reporting.
Field + Lab capability.

Applications

Pull-Off Adhesion Strength Testing is essential for: Residential & commercial buildings, Industrial structures & utility buildings, Plaster quality assessment on walls and ceilings, Tile installation base surface evaluation, Waterproofing & protective coating systems, Repair mortar and overlay bonding verification, Bridges, flyovers, & infrastructure concrete surfaces, Structures requiring plaster or render strength certification

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Pull-Off Adhesion Strength Test of Plaster
Pull-Off Adhesion Strength Test of Plaster

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Global Lab provides comprehensive testing for construction and engineering materials, including concrete, cement, steel, aggregates, bitumen, soil, tiles, paver blocks, and other civil and infrastructure materials. We also handle customized tests as per client or project specifications.

Yes. Our team is equipped with mobile testing facilities and field instruments for on-site sampling, inspection, and testing — ensuring quick and reliable results without disrupting your project timelines.