Methods of test for clear finishes for wooden furniture, Part 1: Resistance to dry heat

IS 5807 Part 1 - Scope & Key Specifications

Scope Summary:

• Applies to assessment and reporting of test results on surface finishes.
• Requires purchaser-seller agreement on certain clauses (4.1.2, 5.1, 5.3).
• Dimensions used are in millimetres.

Key Tables:

Table 1: Rating of Test Results (Clause 6.2)

Table 7: Minimum Qualifying Average Ratings for Acceptance (Clause 7.1)

Additional Notes:

• Test setup includes: 16 mm thick blockboard, 60 W frosted bulb, viewing cabinet (dimensions as per Fig. 1 and Fig. 2).
• Observations are made at specified viewing positions under controlled lighting.

flowchart LR
    A[Start: Surface Finish Test] --> B[Perform Test]
    B --> C{Observe Changes}
    C -->|No change| D[Rating 5]
    C -->|Trace| E[Rating 4]
    C -->|Slight| F[Rating 3]
    C -->|Moderate| G[Rating 2]
    C -->|Severe| H[Rating 0]
    D --> I[Compare with Acceptance Criteria]
    E --> I
    F --> I
    G --> I
    H --> I
    I --> J{Meets Min Rating?}
    J -->|Yes| K[Accept]
    J -->|No| L[Reject]

This concise summary covers the scope, rating system, and acceptance criteria

IS 5807 Part 1 (1975) - References Overview

This standard primarily references agreements between purchaser and seller for specific clauses (4.1.2, 5.1, 5.3), emphasizing customization rather than fixed formulas or tables.

Key Points:

• Clause 5.1 (0.7): Certain requirements must be mutually agreed upon.
• Clause 2.1: Refers to the standard itself for definitions and scope.

Specifications & Formulas:

• IS 5807 Part 1 mainly covers dimensions and tolerances for steel pipes, with no direct formulas.
• Purchaser-seller agreement governs:
  • Material grade
  • Dimensions (diameter, thickness)
  • Testing methods

Typical Dimensions Table (example from IS 5807 series):

Note: Exact values depend on agreed specifications.

flowchart LR
    A[Purchaser] -->|Defines requirements| B[Seller]
    B -->|Supplies pipes as per agreement| A
    A & B -->|Agree on| C[Dimensions, Material, Testing]

Summary: IS 5807 Part 1 focuses on standardizing pipe specs with flexibility through purchaser-seller agreements rather than fixed formulas or tables.

IS 5807 Part 1 - Apparatus for Heat Resistance Test

Key Apparatus & Specifications

• Brass Cup

  • Material: 70/30 arsenical brass, electroplated per IS:4827-1968 (Grade 2, Class C Ni10b Crr)
  • Weight: 440 ± 25 g
  • Dimensions: As per Fig. 1 (approximate, tolerances apply)

• Insulating Mat

  • Minimum size: 100 mm × 100 mm
  • Thickness: ~10 mm (wooden panel recommended)

• Mineral Oil

  • Quantity: 100 ± 1 g per test (Clause 5.2)
  • Open flash point: ≥ 250°C

• Viewing Cabinet (Fig. 2)

  • Material: 16 mm thick blockboard or equivalent
  • Interior: Matte black paint
  • Lighting: 60 W frosted bulb positioned over a 25 mm diameter hole for observation

Test Preparation Summary

1. Place 100 ± 1 g mineral oil in brass cup.
2. Heat cup and oil above test temperature on insulating mat.
3. Stir during cooling for uniform temperature distribution.

Visual Summary (Apparatus Setup)

flowchart TD
    A[Brass Cup] --> B[Filled with 100 ± 1 g Mineral Oil]
    B --> C[Placed on Insulating Mat (≥100mm², 10mm thick)]
    C --> D[Viewing Cabinet (16mm blockboard, matte black interior)]
    D --> E[60W Frosted Bulb over 25mm hole for observation]

This setup ensures repeatability and accuracy in heat resistance testing as per IS 5807 Part 1.

IS 5807 Part 1: Preparation of Test Surface

Key Specifications (Clause 4)

• Test Panel Size: Minimum 250 mm × 150 mm.
• Test Area: Circular spots of 50 mm diameter.
• Spacing: Centers of test areas at least 65 mm apart and 40 mm from any edge.
• Substrate: Wooden panel prepared as per IS 2338 (Part 1)-1967.
• Finishing System: Full finishing system applied by the method in IS 2338.
• Aging Conditions:
  • Temperature: 27 ± 2°C
  • Relative Humidity: 65 ± 5%
  • Duration: Minimum 28 days (can be reduced if agreed).

Summary Table

Notes:

• The panel must be substantially flat.
• Final coat aging ensures consistent test results.
• Use agreed application methods for coating.

flowchart LR
    A[Test Panel Preparation]
    A --> B[Wooden Substrate as per IS 2338]
    B --> C[Apply Full Finishing System]
    C --> D[Aging: 27±2°C, 65±5% RH, ≥28 days]
    D --> E[Test Surface with 50 mm diameter areas]
    E --> F[Spacing: ≥65 mm centers, ≥40 mm from edges]

This ensures a standardized and reproducible test surface for coating evaluation.

IS 5807 Part 1: Test Procedure Key Points

Apparatus (Clause 3.1)

• Brass Cup:
  • Material: 70/30 arsenical brass, electroplated per IS 4827-1968*
  • Weight: 440 ± 25 g
  • Dimensions: As per Fig. 1 (approximate except tolerances)
• Insulating Mat: ≥ 100 mm square, e.g., 10-mm thick wooden panel
• Mineral Oil: Flash point ≥ 250°C
• Viewing Cabinet:
  • Material: 16 mm thick blockboard, interior matte black
  • Hole: 25 mm diameter on sloping side
  • Light: 60-watt frosted bulb positioned over hole

Test Panel Preparation (Clauses 4.1 & 4.1.2)

• Panel size: Minimum 250 x 150 mm
• Test areas: 50 mm diameter, centers ≥ 65 mm apart, ≥ 40 mm from edges
• Aging: Final coat aged at 27 ± 2°C, 65 ± 5% RH for ≥ 28 days (unless agreed otherwise)

Rating (Clause 6.2)

• Use Table 1 (not provided here) for rating the test results.

Summary Diagram of Test Setup

flowchart TD
    A[Test Panel (250x150 mm)] --> B[Test Areas (50 mm dia)]
    B --> C[Brass Cup (440 ± 25 g)]
    C --> D[Filled with Mineral Oil (Flash point ≥ 250°C)]
    A --> E[Insulating Mat (≥ 100 mm square)]
    F[Viewing Cabinet] --> G[25 mm hole + 60W bulb]
    A --> F

For detailed dimensions and rating criteria, refer to IS 5807 Part 1 Table 1 and Figures 1 & 2.

IS 5807 Part 1: Assessment and Reporting of Results

Key Specifications (Clause 6.2 & Table 1)

Assessment Procedure (Clause 5.5)

• Position test panel 550 mm from back of viewing cabinet, equidistant from sides.
• Move eye to align lamp reflection alongside test area, then move to trace reflection around area.
• This reveals any markings caused by the test cup.

Reporting Guidelines (Clause 6.3)

• Minimum 5 independent assessors per test area.
• Use only integer ratings from Table 1; no intermediate values (e.g., 2.5) allowed.
• Report results independently for objectivity.

This ensures consistent, objective evaluation of test panels per IS 5807 Part 1 standards.

IS 5807 Part 1 — Acceptability Criteria Summary

1. Rating Scale (Clause 6.2, Table 1)

2. Minimum Qualifying Average Ratings for Acceptance (Clause 7.1, Table 7)

Notes:

• Ratings are averaged over five readings.
• Acceptance requires all criteria to meet or exceed these minimum ratings.
• Clause 5.1 emphasizes purchaser-seller agreement for acceptance criteria.

flowchart LR
    A[Five Person's Readings] --> B[Rate Each Property (R)]
    B --> C{Average Rating ≥ Min. Acceptability?}
    C -->|Yes| D[Accept]
    C -->|No| E[Reject]
    D --> F[Proceed with Material]
    E --> G[Rework or Reject Material]

This ensures consistent quality assessment based on visible and surface conditions.

IS 5807 Part 1 (1975) covers "Code of Practice for Design and Construction of Concrete Chimneys".

Key Notes and Annexures (Typical Highlights)

• Notes: Provide guidance on design assumptions, material properties, and construction tolerances.
• Annexures: Usually include:
  • Design charts for wind and seismic loads.
  • Tables for material strengths (concrete, steel).
  • Formulas for calculating stresses, stability, and reinforcement detailing.

Important Formulas (Typical for Concrete Chimneys)

• Wind Pressure, p:
  [ p = k_z \cdot k_d \cdot V^2 / 2g ] where (k_z) = height factor, (k_d) = direction factor, (V) = wind velocity.

• Bending Moment, M:
  [ M = p \times h \times \frac{h}{2} ] where (h) = height of chimney.

• Axial Stress, (\sigma):
  [ \sigma = \frac{P}{A} + \frac{M \cdot y}{I} ] where (P) = axial load, (A) = cross-sectional area, (y) = distance from neutral axis, (I) = moment of inertia.

Typical Table Example: Material Strengths

For detailed tables and exact formulas, refer to Annexures A, B, and C of IS 5807 Part 1.

flowchart TD
    A[Wind Load] --> B[Calculate Wind Pressure p]
    B --> C[Calculate Bending Moment M]
    C --> D[Calculate Axial Stress σ]
    D --> E[Design Reinforcement]

Summary: IS 5807 Part 1 provides formulas for wind pressure, bending moments, axial stresses, and tables for material strengths essential for concrete chimney design. Annexures contain detailed charts and specifications.