Quality Tests for Bituminous Pipe Coatings

Material tests

• Softening point
• Penetration
• Filler content
• Sag and flow tests

Applied coating tests

• Thickness
• Holiday (spark) testing
• Adhesion / peel
• Impact resistance

Purpose of testing

Tests confirm that coating materials meet specification and that the applied coating protects the pipe as designed.

Common tests in more detail

• Softening point shows resistance to flow at service temperature.
• Penetration indicates hardness.
• Sag test checks that hot enamel does not run on a vertical panel.
• Holiday test uses a high-voltage spark to detect pinholes.
• Peel test measures adhesion to steel.
• Impact test checks resistance to handling damage.

Acceptance

Every coating specification sets limits for each test. Record results with batch numbers for traceability.

See pipe coating grade gilsonite and quality tests.