Test to determine Mohs Scratch Hardness ASTM C1895

ASTM C1895 is used to determine Mohs scratch hardness—resistance to scratching—of a tile. The sample is scratched with minerals of known hardness to determine how hard the sample is relative to other objects.

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Test to determine Mohs Scratch Hardness ASTM C1895

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Overview
Scope, Applications, and Benefits
Test Process
Specifications
Instrumentation
Results and Deliverables

Overview

ASTM C1895 is used to determine the Mohs scratch hardness of tiles and other hard surfaces by assessing their ability to withstand scratches. The test compares the scratch hardness of the material under test with other reference materials of known Mohs hardness.

This test is used to determine the relative hardness of materials such as ceramic and glass tiles by assessing whether they can be scratched by a material of known Mohs hardness, which can be used to assess their durability for specific purposes.

Scope, Applications, and Benefits

Scope

In ASTM C1895, the scratch resistance of tile surfaces is assessed by comparing the tile surface with a mineral or material known for its hardness on the Mohs hardness scale. The test measures the relative hardness of the specimen based on the scratching behavior observed during the test.

ASTM C1895 evaluates:

Mohs scratch hardness of tile surfaces
Resistance to surface scratching
Relative hardness compared with reference materials
Surface durability under abrasive contact
Material suitability for wear-prone applications

Applications

Ceramic and porcelain tile manufacturing
Glass tile and decorative surface materials
Construction and architectural materials
Electronic display surface evaluation
Surface coating durability studies
Material research and development

Benefits

Provides a simple method for evaluating scratch resistance
Supports comparison between tile materials
Assists in material selection for durability requirements
Helps ensure consistency in tile manufacturing
Supports product performance evaluation

Test Process

Sample Preparation

The tile specimen surface is cleaned and prepared to ensure accurate scratch evaluation.

Reference Material Selection

Materials with known Mohs hardness values are selected for comparison testing.

Scratch Application

The specimen surface is scratched using reference materials to observe surface response.

Data Recording & Evaluation

The presence or absence of scratches is evaluated to determine the specimen's relative Mohs hardness.

Technical Specifications

Parameter	Details
Applicable Materials	Ceramic, porcelain, and glass tiles
Specimen Geometry	Flat tile surface specimen
Reference Materials	Minerals or objects with known Mohs hardness values
Test Method	Comparative scratch testing
Evaluation Criteria	Visible surface scratching behavior
Measured Outputs	Mohs scratch hardness value

Instrumentation Used for Testing

Mohs hardness reference mineral set
Scratch testing tools
Optical inspection equipment
Surface cleaning tools
Sample holding fixtures
Measurement and observation equipment

Results and Deliverables

Mohs scratch hardness value
Observed scratching behavior
Reference material comparison results
Surface condition observations
Compliance report

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Frequently Asked Questions

ASTM C1895 measures Mohs scratch hardness by testing a material's resistance to scratching against standard materials of known hardness values for classifying surface durability and relative hardness of glass and ceramic materials.

Scratch hardness testing, also known as Mohs scratch hardness testing, can be used to determine the resistance of a material to abrasion and scratching. ASTM C1895 helps manufacturers compare the durability of their materials, ensuring products have longevity and keep their appearance and performance during wear.

In ASTM C1895, reference minerals from the Mohs hardness scale are scratched across the surface of the material under controlled conditions. The hardest mineral that can produce a visible scratch is used to determine the hardness value.

The most commonly used standard for this purpose is ASTM C1895, which is generally applied for architectural glass, ceramic tile, protective coatings, and decorative materials where scratch resistance on the surface is of concern.

The relative hardness ranking is given by ASTM C1895 rather than specific mechanical hardness data. The results may be affected by surface preparation, operator interpretation, and material anisotropy, making it less quantitative than indentation hardness testing.