QA/QC › Painting & Coatings › Paint Adhesion (Cross-Cut)

Test-report · QC-PNT-TST-002

Paint Adhesion (Cross-Cut) Test Report

6 checkpoints across 3 sections. After paint application and drying; adhesion testing mandatory for critical areas

6 Checkpoints

3 Sections

Minimum 3 test areas per project; per 500m² for large areas

QC Engineer, Painting Contractor

S.No.	Checkpoint	IS Requirement
A. TEST PROCEDURE
A1	Cross-cut adhesion test per IS 101/ASTM D3359; grid pattern 11 parallel lines each direction (1mm spacing) Acceptance: Grid spacing 1mm nominal; cuts through paint to substrate; tape applied and pulled at 45 degrees	Cl. 401 — Test method
B. TEST RESULTS & CLASSIFICATION
B1	Test area 1: Paint adhesion rating 0-5 (0=no adhesion, 5=complete adhesion); rating assigned Acceptance: Rating 5: No paint removal; 4: <5% removal; 3: 5-15% removal; 2: 15-35%; 1: >35%; 0: total failure	Cl. 401 — Individual test result
B2	Test area 2: Paint adhesion rating recorded; pattern of failure documented Acceptance: Expected ≥4 (acceptable) or ≥3 (marginal); <3 indicates adhesion failure	Cl. 401 — Individual test result
B3	Test area 3: Paint adhesion rating recorded; consistency with previous areas noted Acceptance: Ratings should be consistent; large variation indicates application or surface prep issue	Cl. 401 — Consistency check
C. ACCEPTANCE CRITERIA
C1	Adhesion rating ≥4 (best practice) or ≥3 (minimum acceptable) for all test areas Acceptance: Rating 5 or 4 = PASS; rating 3 = conditional PASS; rating <3 = FAIL; re-application required	Cl. 401 — Adhesion acceptance
C2	Failure pattern analysis: Cohesive (within paint) = OK; adhesive (at interface) = problem Acceptance: Cohesive failure indicates paint quality issue; adhesive indicates surface prep or primer issue	Cl. 401 — Failure mode assessment

A. TEST PROCEDURE

A1Cross-cut adhesion test per IS 101/ASTM D3359; grid pattern 11 parallel lines each direction (1mm spacing)

Cl. 401 — Test method (IS 101)

✓ Grid spacing 1mm nominal; cuts through paint to substrate; tape applied and pulled at 45 degrees

B. TEST RESULTS & CLASSIFICATION

B1Test area 1: Paint adhesion rating 0-5 (0=no adhesion, 5=complete adhesion); rating assigned

Cl. 401 — Individual test result (ASTM D3359)

✓ Rating 5: No paint removal; 4: <5% removal; 3: 5-15% removal; 2: 15-35%; 1: >35%; 0: total failure

B2Test area 2: Paint adhesion rating recorded; pattern of failure documented

Cl. 401 — Individual test result (ASTM D3359)

✓ Expected ≥4 (acceptable) or ≥3 (marginal); <3 indicates adhesion failure

B3Test area 3: Paint adhesion rating recorded; consistency with previous areas noted

Cl. 401 — Consistency check (ASTM D3359)

✓ Ratings should be consistent; large variation indicates application or surface prep issue

C. ACCEPTANCE CRITERIA

C1Adhesion rating ≥4 (best practice) or ≥3 (minimum acceptable) for all test areas

Cl. 401 — Adhesion acceptance (IS 2395)

✓ Rating 5 or 4 = PASS; rating 3 = conditional PASS; rating <3 = FAIL; re-application required

C2Failure pattern analysis: Cohesive (within paint) = OK; adhesive (at interface) = problem

Cl. 401 — Failure mode assessment (IS 101)

✓ Cohesive failure indicates paint quality issue; adhesive indicates surface prep or primer issue

Inspection Sign-Off

PASSED

CONDITIONAL PASS

FAILED — RE-PAINT

Test Conducted By

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Reviewed By

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