Biuged BGD 536 Automatic Mar Resistance Scratch Tester

The Biuged BGD 536 Automatic Mar Resistance Scratch Tester is a precision instrument designed to evaluate the mar resistance of coatings using a controlled, motor‑driven stylus system. Mar resistance refers to a visible blemish on a coating caused by deformation that changes the way light reflects from the surface. The BGD 536 provides a standardized, repeatable method for determining the load at which a coating begins to show mar damage. The instrument evaluates the mar resistance of a coating by pushing a curved (loop‑shaped or ring‑shaped) stylus across the coated surface under an increasing load.

The coating is applied at uniform thickness to a flat, smooth test panel. After curing:

• The panel is placed beneath the stylus.

• The stylus presses on the surface at a 45° angle.

• Load is increased stepwise until a visible mar (surface blemish) appears.

This method is similar to scratch‑resistance testing but uses a loop or ring stylus specifically designed to detect mar rather than full coating penetration.

Key Features

Purpose‑Built Mar‑Testing Stylus

Uses a loop‑shaped or ring‑shaped stylus to detect mar formation, providing more sensitive evaluation than standard scratch testers.

Controlled Stylus Angle

The stylus is mounted at a precise 45° angle, ensuring consistent contact geometry and repeatable results.

Stepwise Load Increase

Load is increased in controlled increments until the coating exhibits visible mar damage, allowing accurate determination of mar‑resistance thresholds.

Uniform Test Panel Requirements

Designed for coatings applied at uniform thickness on flat panels with consistent surface texture, ensuring reliable comparison across samples.

Automatic, Motor‑Driven Operation

The BGD 536 automates stylus movement for consistent speed and pressure, reducing operator variability and improving repeatability.

Technical Specifications

• Stylus type: Loop‑shaped or ring‑shaped

• Stylus angle: 45°

• Test method: Stepwise load increase until mar occurs

• Application: Single‑coat or top‑layer mar resistance

• Panel requirements: Flat, uniform‑texture, uniform‑thickness coatings

• Operation: Automatic motor‑driven movement

Ideal Applications

• Decorative and protective coatings

• Automotive and appliance finishes

• Plastic coatings and varnishes

• R&D formulation comparison

• QC testing for mar‑resistant surfaces

• Comparative durability testing across coating systems

Why Choose the Biuged BGD 536?

The BGD 536 provides high‑precision, standards‑aligned mar‑resistance testing using a loop‑stylus method specifically designed to detect subtle surface blemishes. Its automatic movement, controlled stylus angle, and stepwise loading ensure consistent, repeatable results that outperform manual scratch‑test methods. For laboratories and manufacturers evaluating surface durability, gloss retention, and resistance to cosmetic damage, the BGD 536 offers a reliable, professional‑grade solution.