Methods of test for clear finishes for wooden furniture, Part 3: Resistance to marking by oils and fats

IS 5807 Part 3 — Scope Summary:

• Purpose: Standardizes a test method to evaluate the resistance of clear finishes on wooden furniture to marking by oils and fats.
• Application: For comparing finishes or verifying supply standards under conditions simulating oil/fat spillage.
• Test Substrate: No fixed wood or finishing system specified; must be agreed upon by purchaser and vendor.
• Key Procedure: If a test area fails, repeat on another panel. Two failures classify the finish as unacceptable (Clause 6.1).

Key Points:

Testing Decision Flow (Clause 6.1):

flowchart TD
    A[Test Area 1] -->|Pass| B[Finish Acceptable]
    A -->|Fail| C[Repeat Test on New Panel]
    C -->|Pass| B
    C -->|Fail| D[Finish Unacceptable]

For detailed test procedures and preparation, refer to the full IS 5807 Part 3 document.

IS 5807 Part 3: General Requirements Summary

Scope:

• Test clear finishes on wooden furniture for resistance to marking by oils and fats.
• No uniform substrate specified; finish system and substrate agreed by purchaser/vendor.

Key Clause 6.1 - Re-test Procedure:

• If one test panel fails, repeat test on another panel.
• If failure recurs, finish is unacceptable for that material.

Visual Assessment:

• Total absence of disfigurement is mandatory for compliance.
• Individual visual judgment varies; standard requires no visible marking.

Related Standards in Series:

Reporting:

• Follow rounding rules as per IS 2-1960.

Summary Table: Re-test Criteria (Clause 6.1)

This standard ensures finishes on wooden furniture resist oils/fats without visible damage, validated by repeatable testing.

IS 5807 Part 3: Preparation of Test Surface - Key Points

Panel Dimensions & Test Area (Clause 3.1)

• Panel size: ≥ 250 mm × 150 mm × 10 mm thick
• Test area diameter: 25 mm
• Minimum spacing between test areas: 50 mm center-to-center
• Distance from panel edges: ≥ 40 mm

Coating & Aging (Clauses 3.1.1 & 3.1.2)

• Apply full finishing system per IS 2338 (Part I) - 1967
• Allow final coat to age at ≥ 15°C with free air for ≥ 28 days before testing

Test Procedure (Clause 4.1)

• Place oil/fat pools ~25 mm diameter (minimum 2 per test material) randomly on panel avoiding same grain structure
• Maintain panel at 27 ± 2°C for 24 hours
• Remove oil/fat with soft absorbent cloth
• Rub test area with soft cloth dampened in 0.5% glacial acetic acid solution
• Final polish with soft dry cloth
• Visually inspect for any marking, discoloration, or disfigurement (none should be visible)

Summary Table

flowchart TD
    A[Prepare panel (≥250x150x10 mm)] --> B[Apply finishing system (IS 2338 Part I)]
    B --> C[Age final coat ≥28 days at ≥15°C]
    C --> D[Place oil/fat spots (~25 mm dia)]
    D --> E[Condition panel at 27±2°C for 24 h

IS 5807 Part 3 — Test Procedure: Key Points & Specifications

Test Panel Preparation (Clause 3.1)

• Panel size: Minimum 250 mm x 150 mm x 10 mm thickness.
• Test areas: Circular spots of 25 mm diameter, spaced at least 50 mm apart and 40 mm from edges.
• Panel must be flat and finished.

Aging (Clause 3.1.2)

• Final coat must age at room temperature ≥ 15°C with free air access.
• Minimum aging period: 28 days before testing.

Test Application (Clause 4)

• Place at least two pools of oil/fat (~25 mm diameter) per test material on the panel.
• Test spots must be randomly located and not on the same grain.
• Leave undisturbed at 27 ± 2°C for 24 hours.
• Remove oil/fat with soft absorbent paper.
• Rub test area with 0.5% acetic acid solution (analytical grade glacial acetic acid in distilled water).
• Final light polish with a soft dry cloth.

Evaluation (Clause 6.1)

• If one test area fails, repeat test on a new panel.
• If failure recurs, finish is unacceptable for that material.

Summary Table: Test Panel & Procedure

flowchart TD
    A[Prepare panel] --> B[Apply oil/fat spots (≥2 per material)]
    B --> C[Age panel 28 days at ≥15°C]
    C --> D[Expose spots at 27±2°C for 24h]
    D --> E[Remove oil/fat with absorbent paper]
    E --> F[Rub with 0.

IS 5807 Part 3: Assessment and Reporting of Results

Key Specifications:

• Visual Examination (Clause 4.2):

  • Inspect test panels at 90° and 30° angles under bright natural daylight.
  • Look for any disfigurement or marking due to oil/fat spills.

• Assessment Criteria (Clause 3.1):

  • Total absence of disfigurement is mandatory for compliance.
  • Visual assessment is subjective; strict criteria ensure finish quality.

• Re-Test Procedure (Clause 6.1):

Reporting:

• Use IS 2-1960 for rounding off final test values.
• Report results clearly, stating pass/fail based on above criteria.

Summary Table for Assessment:

flowchart TD
    A[Test Panel 1] -->|Pass| B[Accept Finish]
    A -->|Fail| C[Test Panel 2]
    C -->|Pass| B
    C -->|Fail| D[Reject Finish]

This ensures consistent quality control for clear finishes on wooden furniture.

IS 5807 Part 3: Re-Test Procedure for Resistance to Marking by Oils and Fats

Clause 6.1 Summary:

• If one test area fails for a given test material, repeat the test on another test panel.
• If the second test also fails, the finish is classed as unacceptable for that test material.

Key Points:

• Test panels: Use new panels for re-test.
• Test conditions: Maintain temperature at 27 ± 2°C for 24 hours.
• Test materials: Pools of oil or fat (~25 mm diameter, at least two per material).
• Post-test cleaning: Remove oil/fat, rub with 0.5% acetic acid solution, polish dry.
• Evaluation: Visual examination for marks or finish degradation.

Flowchart of Re-Test Decision:

flowchart TD
    A[Initial Test] --> B{Failure in any test area?}
    B -- No --> C[Finish Accepted]
    B -- Yes --> D[Repeat Test on New Panel]
    D --> E{Failure Again?}
    E -- No --> F[Finish Accepted]
    E -- Yes --> G[Finish Unacceptable]

Additional Notes:

• Final coat aging: Minimum 28 days at ≥15°C before testing (Clause 3.1.2).
• Test ensures quality consistency or comparative finish evaluation.

For detailed test methods and contact info, refer to IS 5807 Part 3 (1971), BIS Manak Bhavan, New Delhi.

IS 5807 (Part 3) - 1971: References to Related Standards and Practices

This part of IS 5807 covers methods of test for clear finishes for wooden furniture, specifically resistance to marking by oils and fats.

Key Points:

• Test Retesting (Clause 6.1):

  • If a test panel fails, repeat test on a new panel.
  • If failure recurs, the finish is unacceptable for that material.

• Scope:

  • No uniform substrate or finishing system is specified due to diversity in woods and finishes.
  • Test methods should be agreed between purchaser and vendor.

• Related Standards & Practices:

  • Testing procedures align with general painting and varnishing standards.
  • Refer to IS codes on painting, varnishing, and allied finishes for complementary practices.

Practical Application:

Contact & Reference:

• BIS Headquarters: Manak Bhavan, New Delhi
• For detailed procedures, consult Painting, Varnishing and Allied Finishes Sectional Committee (BDC 34).

This standard ensures consistent evaluation of clear finishes under oil/fat exposure, critical for furniture durability assessment.