Door Shutters - Methods of Tests

IS 4020 Part 1-16: Scope Summary

• Scope: Specifies methods for testing door shutters, including measurement of dimensions and squareness.
• Specimen Testing: Clause 3.2 states that if a test specimen fails due to mechanical reasons (equipment failure, improper preparation), discard and retest with a new specimen.
• Dimension Measurement:
  • Measurements are taken at 20 ± 5 mm from edges (revised from "20 mm or less").
  • For rebated edges, height/width is measured to the inner edges of the rebate.
• Square-ness: Measured as per Part 2, ensuring door shutters meet dimensional tolerances.

Key Specifications:

Notes:

• This part mainly covers general test procedures.
• For detailed formulas or tolerances, refer to IS 4020 Part 2 for dimensional checks.

flowchart TD
    A[Test Specimen Prepared] --> B{Mechanical Failure?}
    B -- Yes --> C[Discard Specimen]
    B -- No --> D[Perform Dimension & Squareness Measurement]
    D --> E[Measure at 20 ± 5 mm from edges]
    E --> F{Rebated Edges?}
    F -- Yes --> G[Measure to inner rebate edges]
    F -- No --> H[Measure normally]
    G & H --> I[Evaluate Test Results]

For full test procedures and tolerances, consult IS 4020 Part 2.

IS 4020 Part 1-16: Measurement of Dimensions and Squareness

Key Specifications & Methods

• Squareness Measurement (Clause 2.4.1):

  • Use a square with 500 mm arms to check deviation from squareness at all 4 corners of the door leaf.
  • Accuracy: ±0.1 mm.
  • Deviation is measured as the gap between the door edge and the square arm (see Fig. 2).

• Width Measurement (Clause 2.2.1):

  • Measure width along lines C-C and D-D, parallel and within 20 mm of the transverse edges.
  • Accuracy: ±1 mm.

• Flatness & Warping (Amendment Nov 2011):

  • Door held vertically with long edge horizontal.
  • Measure warping/cupping using a straight edge placed ≤20 mm from edges.
  • Deviation measured perpendicular to straight edge, accuracy ±0.1 mm.

Summary Table

flowchart LR
    A[Door Shutter] --> B[Measure Width at C-C, D-D (≤20 mm from edges)]
    A --> C[Check Squareness at 4 corners with 500 mm square]
    A --> D[Check Flatness using straight edge ≤20 mm from edges]
    B --> E[Width ±1 mm]
    C --> F[Squareness ±0.1 mm]
    D --> G[Warp/Cup ±0.1 mm]

Note: Use calibrated precision tools for all measurements to meet accuracy requirements.

IS 4020 Part 3 – Measurement of General Flatness of Door Shutters

Key Specifications & Procedure:

• Positioning: Door shutter held vertically with the long edge horizontal.
• Measuring Points: Located 20 ± 5 mm from the edges on the shutter face.
• Accuracy: Measurements to 0.1 mm accuracy.

Measurement Method:

1. Flatness (Warping & Cupping):

   • Use a straight edge placed parallel and within 20 mm of each edge.
   • Measure the gap between the door face and straight edge at specified points.
   • Record the maximum deviation as the flatness measure.

2. Thickness Measurement:

   • Measure height along lines A-A and B-B (parallel and ≤ 20 mm from longitudinal edges).
   • Accuracy of 1 mm.

3. Squareness (Clause 2.4.1):

   • Use a square with 500 mm arms at all four corners.
   • Measure deviation from squareness to 0.1 mm.

Summary Table:

flowchart LR
    A[Door Shutter] --> B[Hold Vertically]
    B --> C[Place Straight Edge ≤ 20 mm from Edge]
    C --> D[Measure Gap at 20 ± 5 mm Points]
    D --> E[Record Flatness Deviation (0.1 mm)]
    A --> F[Measure Thickness at A-A & B-B Lines]
    F --> G[Record Thickness (1 mm)]
    A --> H[Check Squareness with 500 mm Square]
    H --> I[

IS 4020 Part 4: Local Planeness Test - Key Points

• Test Setup:

  • Door shutter placed horizontally or held conveniently.
  • Surface divided into 200 mm × 200 mm squares covering entire shutter.
  • A straight edge of 150-200 mm length with a measuring device fixed at its center is placed on these squares.

• Measurement:

  • Depth (deviation from planeness) measured at the center of each square.
  • Accuracy of measurement: ±0.05 mm to 0.1 mm depending on amendment.
  • Procedure repeated on both faces of the door shutter.

• Purpose:

  • To ascertain the general smoothness and flatness of the door shutter surface.

Summary Table for Local Planeness Test

Measurement Principle

• Place the straight edge on the square.
• Measure the gap (depth) between the door surface and the straight edge at the center.
• Repeat for multiple squares to assess overall planeness.

graph TD
A[Door Shutter Surface] --> B[Divide into 200x200 mm squares]
B --> C[Place straight edge on square]
C --> D[Measure depth at center]
D --> E[Record deviation ±0.05 mm accuracy]
E --> F[Repeat on all squares & both faces]

This method ensures the door shutter surface is uniformly flat and smooth as per IS 4020 Part 4 requirements.

IS 4020 Part 5: Impact Indentation Test - Key Specifications & Procedure

Test Objective:
Determine the impact indentation resistance of door shutters.

Steel Ball Impact Test (Clause 2.1)

• Setup: Door shutter placed horizontally, supported equally on all four edges.
• Impact Body: Steel ball, diameter = 50 mm, weight = 500 ± 10 g.
• Drop Height: 750 ± 5 mm.
• Impact Points: 10 random points on each face, minimum 75 mm from edges.
• Measurement: Depth of indentation measured to an accuracy of 0.1 mm.

Summary Table

Notes:

• The door must be supported rigidly to avoid deflection.
• Indentation depth is the key outcome to assess surface resistance.

flowchart LR
    A[Place door shutter horizontally] --> B[Support on all 4 edges equally]
    B --> C[Drop steel ball (50 mm, 500 g) from 750 mm height]
    C --> D[Impact at 10 random points per face, ≥75 mm from edges]
    D --> E[Measure indentation depth (accuracy 0.1 mm)]
    E --> F[Evaluate impact resistance]

This test ensures the door shutter surface can withstand sudden localized impacts without excessive indentation.

IS 4020 Part 6: Flexure Test for Door Shutters - Key Specifications & Procedure

• Specimen Setup: Door shutter held firmly along one long edge and adjacent short edge; 3 fixed corners in one horizontal plane.
• Loading: Applied at the free top corner, 50 mm from the edge, vertically downward.
• Load Steps: Increase in steps of 100 N (10 kgf) up to 500 N (50 kgf).
• Load Duration: Hold each load for 15 minutes, then unload in the same steps.
• Measurements:
  • Deflection measured initially, after 15 min under load, and 3 min after load removal.
  • Deflections measured at the free corner relative to the diagonally opposite fixed corner.
  • Accuracy: ±0.1 mm.

Summary Table

Deflection Measurement Reference

• Deflection is vertical displacement of the free corner.
• Reference corner is diagonally opposite fixed corner.

flowchart LR
    A[Hold door shutter on 3 edges] --> B[Apply load at free corner 50 mm from edge]
    B --> C[Increase load in 100 N steps up to 500 N]
    C --> D[Measure deflection initially and after 15 min]
    D --> E[Unload in same steps]
    E --> F[Measure deflection 3 min after unloading]

This method ensures standardized assessment of flexural resistance of door shutters per IS 4020 (Part 6).

IS 4020 Part 7: Edge Loading Test - Key Specifications & Procedure

• Mounting: Door shutter hung vertically on 12 mm dia pivots at top & bottom or hinged on one longitudinal edge.
• Loading: Applied on the opposite longitudinal edge, parallel to door plane, at 25 ± 5 mm from edge.
• Load steps: Increase in increments ≤ 200 N (20 kgf) up to 1000 N (100 kgf).
• Duration: Load held constant for 15 minutes.
• Deflection Measurement: At loaded edge
  • After 15 min under load
  • 3 min after load removal
  • Accuracy: ±0.1 mm
• Door opening angle: 45° or 90° during test.

Summary Table

Test Setup Illustration (Mermaid.js)

graph LR
A[Door Shutter] -- Hinged or Pivoted --> B[Vertical Mounting]
B -- Load Applied --> C[Edge Load at 25 ± 5 mm]
C -- Load Steps --> D[Incremental Load to 1000 N]
D -- Hold Load --> E[15 min]
E -- Measure Deflection --> F[At Loaded Edge]
F -- Measure After Removal --> G[3 min later]

This test evaluates edge joint stiffness and deflection under realistic loading, simulating door operation stresses.

IS 4020 Part 8: Shock Resistance Test - Key Specifications & Setup

Test Setup:

• Mounting: Door shutter hinged vertically on a rigid frame simulating actual installation.
• Frame: Rigid enough to avoid deformation affecting results.

1. Soft and Light Body Impact Test:

• Impact Body: Leather ball, ∅ ≈ 200 mm, filled with 50 N (5 kgf) sand.
• Pendulum Setup: Ball hung on a rope, length adjusted to strike 200 ± 10 mm above door bottom on vertical centerline.
• Procedure: Pull ball away to 230 mm from door plane, release to strike.
• Number of impacts: 5 impacts on both sides at handle level.

2. Soft and Heavy Body Impact Test:

• Impact Body: Spherical leather bag, ∅ ≈ 350 mm, mass 300 N (30 kgf) filled with sand (density ~1500 kg/m³, passing 2 mm sieve).
• Pendulum Setup: Bag hung so it just touches door at rest.
• Procedure: Door with all fixings is struck 5 times on both sides at handle level.

3. Impact Indentation Test (Clause 2.1):

• Impact Body: Steel ball, ∅ 50 mm, weight 500 ± 10 g.
• Drop Height: 750 ± 5 mm.
• Impact Points: 10 random points on each side, 75 mm from edges.
• Measurement: Indentation depth measured to 0.1 mm accuracy.

Summary Table:

Buckling Resistance Test - IS 4020 (Part 9)

Test Setup:

• Door shutter fixed rigidly simulating actual installation.
• Open door to 90° ± 5°, secured at top free corner to prevent lateral movement.
• Load applied at 1000 ± 5 mm from bottom, perpendicular to door plane and in opening direction.

Loading Procedure:

• Start with 100 N increments up to 400 N (40 kgf).
• Apply load increment only after deformation stabilizes.
• Measure deformation at the lower free corner:
  • After 5 minutes of loading.
  • After 15 minutes of unloading.
• Accuracy of deformation measurement: ±1 mm.

Key Specifications Summary:

Test Principle:

The test evaluates door shutter's resistance to buckling deformation under lateral load simulating operational forces.

flowchart LR
    A[Door Shutter Mounted Rigidly] --> B[Open at 90° ± 5°]
    B --> C[Load Applied at 1000 mm Height]
    C --> D[Incremental Load: 100 N steps up to 400 N]
    D --> E[Measure Deformation at Lower Free Corner]
    E --> F[After 5 min Load Stabilization]
    E --> G[After 15 min Unloading]

This test ensures the door shutter maintains structural integrity under lateral forces, preventing permanent buckling or excessive deformation.

IS 4020 Part 10: Slamming Test - Key Specifications & Procedure

Test Objective:
To assess the door shutter's durability against repeated slamming impacts.

Test Setup:

• Mounting: Door shutter placed horizontally, hinged on one long edge.
• Support: Resting freely on a wooden rail 50 mm from the opposite long edge.
• Hinges: Three equidistant hinges or as per manufacturer discretion.
• Initial Position: Other long edge lifted to at least 30° from horizontal.

Test Procedure:

• The lifted edge is allowed to drop freely under its own weight.
• Number of Drops: 50 times.
• Drop Rate: 4 to 5 drops per minute.

Alternative Test (Clause 2.1):

• Door shutter rests horizontally on a frame supporting all four edges.
• A steel ball of 50 mm diameter and weight 500 ± 10 g is dropped.
• Drop Height: 750 ± 5 mm.
• Impact Points: 10 random points on both surfaces, at least 75 mm from edges.
• Measure indentation depth with 0.1 mm accuracy.

Summary Table:

flowchart LR
    A[Door Shutter Horizontal] --> B[Hinged on one long edge]
    B --> C[Other edge lifted ≥ 30°]
    C --> D[Drop freely on wooden rail 50 mm away]
    D --> E[Repeat 50 drops @ 4-5 drops/min]
    F[Alternative Test] --> G[Steel ball 50 mm dia, 500 g]
    G --> H[Drop from 750 mm height at 10 points]
    H --> I[Measure indentation depth (0.1 mm accuracy

IS 4020 Part 1-16: Misuse Test Key Details

Misuse Test (Clause 2.1)

• Test Setup:

  • Door shutter mounted as per specification.
  • A spherical leather sailcloth bag (~350 mm diameter) filled with sand weighing 300 N (30 kgf).
  • Bag hung as pendulum to strike the door at handle level.
  • When at rest, bag just touches the shutter.

• Test Procedure:

  • Door shutter (with hangings and fixings) is subjected to 5 impacts on both sides at handle level by the pendulum bag.

• Purpose:

  • To evaluate resistance to soft and light body impact.

Additional Notes

• Door shutters for tests shall not be painted/varnished.
• Rounding off test values per IS 2:1960.
• Figures for test setup are given in IS 4020 Part 1 (Fig. 2).

Summary Table of Misuse Test Parameters

flowchart LR
    A[Pendulum Bag (300 N)] -->|Strikes| B(Door Shutter at Handle Level)
    B --> C{Number of Impacts}
    C -->|5 impacts each side| D[Performance Evaluation]

This test simulates misuse by soft body impact to verify door shutter durability per IS 4020 Part 1-16.

Varying Humidity Test (IS 4020 Part 12:1998) - Key Specifications & Procedure

• Purpose: Evaluate dimensional stability and flatness of door shutters under cyclic humidity changes.

• Test Conditions:

  • Temperature: 27°C ± 2°C
  • Humidity Cycle:
    1. 30% ± 5% RH for 1 week (initial conditioning)
    2. 85% ± 5% RH for 1 week (high humidity exposure)
    3. 30% ± 5% RH for 1 week (recovery phase)

• Measurements:

  • Measure height, width, thickness, and diagonal after each phase.
  • Measure general flatness as per IS 4020 Part 3 after the final phase.

• Acceptance Criteria:

  • Dimensional changes are noted.
  • Extent of return to original dimensions after recovery phase is calculated.
  • Test may stop early if two successive general flatness measurements (2 days apart) differ by ≤ 1%.

Summary Table

Notes:

• Use Part 2 for dimensional methods and Part 3 for flatness measurement.
• Dimensional changes indicate swelling/shrinkage due to moisture.
• This test ensures door shutters maintain performance under moisture variations.

flowchart TD
    A[Start: Door Shutter] --> B[Condition at 30% RH, 27°C for 1 week]
    B --> C[Measure dimensions]
    C --> D[Condition at 85% RH, 27°C for 1 week]
    D --> E[Measure dimensions]
    E --> F[Condition at 30% RH, 27°C for 1 week]
    F -->

IS 4020 (Part 13) End Immersion Test - Key Specifications & Procedure

Purpose:
To assess resistance of door shutters to water immersion.

Test Procedure (Clause 2.1 & 3.1)

• Specimen Condition:

  • No exposure to <4℃ for 24 hrs before test.
  • Free from visible moisture and flaws.

• Immersion Details:

  • Immerse door shutter to a minimum depth of 300 mm in water at ambient temperature.
  • Duration: 24 hours immersion + 24 hours drying at ambient temperature.
  • Repeat the cycle 8 times.

• Observation:

  • Examine the immersed portion for delamination or any damage.

Summary Table

Notes

• The test simulates prolonged water exposure to check durability.
• Door shutters showing delamination fail the test.
• Ensures quality and longevity in humid/wet environments.

flowchart LR
    A[Start: Specimen Prep] --> B{No visible moisture/flaws?}
    B -- Yes --> C[Immerse 300 mm in water (24 hrs)]
    C --> D[Dry at ambient (24 hrs)]
    D --> E{Repeat 8 cycles?}
    E -- Yes --> C
    E -- No --> F[Inspect for delamination]
    F --> G{Delamination?}
    G -- No --> H[Pass Test]
    G -- Yes --> I[Fail Test]

This concise format covers the essentials of the End Immersion Test per IS 4020 Part 13.

Knife Test for Glue Adhesion (IS 4020 Part 14:1998)

Test Setup (Clause 2.2)

• Specimen placed against a wooden batten on a stout table.
• Knife edge parallel to the grain of outer veneer.
• Knife inserted along the glue line, prising veneer upward.
• Knife must be firmly guided along the glue line.

Knife Specifications (Clause 2.1)

• Knife as per Fig. 1 (usually made from a file).
• Cutting edge must be chisel sharp.

Test Procedure (Clause 3.1)

• Specimens must be:
  • Stored above 4℃ for 24 hours before testing.
  • Free from visible moisture and flaws.
• Qualitative assessment of glue adhesion by prising veneer with the knife.

Preconditioning (Clause 2.1 of Part 14)

• Door shutter immersed 300 mm in water at ambient temperature for 24 hrs.
• Dried for 24 hrs at ambient temperature.
• Repeat cycle 8 times.
• Check for delamination post cycles.

Summary Table for Knife Test Conditions

flowchart LR
    A[Specimen Prep] --> B[Immersion 24h in water]
    B --> C[Dry 24h ambient]
    C --> D{Repeat 8 times}
    D -->|Yes| B
    D -->|No| E[Knife Test]
    E --> F[Insert knife parallel to grain]
    F --> G[Prize veneer upward]
    G --> H[Inspect for delamination]

This test is qualitative, focusing on the ability of the knife to separate veneer along glue lines, indicating adhesion quality.

IS 4020 Part 14: Glue Adhesion Test (Knife Test) Summary

Test Setup (Clause 2.2)

• Specimen placed against a wooden batten fixed on a stout table.
• Knife edge parallel to grain of outer veneer.
• Knife inserted along glue line, prising veneer upward.
• Knife must be firmly guided along glue line.

Specimen Conditioning (Clause 3.1)

• No exposure below 4℃ for 24 hours before test.
• Specimen must be dry and free from visible flaws.

Water Immersion Cycle (Clause 2.1)

• Door shutter immersed 300 mm deep in water at ambient temperature for 24 hrs.
• Dried for 24 hrs at ambient temperature.
• Cycle repeated 8 times.
• Check for delamination after cycles.

Knife Specifications (Clause 2.1)

• Knife made from a file, chisel-sharp cutting edge (see Fig. 1 in IS).
• Used to pry veneer along glue line.

Key Points:

Purpose:

• Qualitative assessment of glue adhesion between core and veneers.
• Detect delamination after water exposure cycles.

flowchart LR
    A[Specimen Preparation] --> B[Conditioning: ≥4℃, Dry, Flawless]
    B --> C[Immersion: 300mm water, 24 hrs]
    C --> D[Drying: 24 hrs ambient]
    D --> E[Repeat 8 cycles]
    E --> F[Knife Test: Insert knife along glue line]
    F --> G[Check for Delamination]

This test ensures durability of glue lines under moisture exposure, critical for door shutter quality.

IS 4020 Part 1-16: Screw Withdrawal Resistance Test - Key Points

The code does not provide explicit formulas or tables for the Screw Withdrawal Resistance Test in the provided context. However, based on standard engineering practice and related IS codes (e.g., IS 4020 series for door shutters), the following applies:

Test Setup (Clause 2.2)

• The specimen edge is fixed against a wooden batten on a stout table.
• Screws are withdrawn parallel to the grain of the outer veneer.
• The withdrawal force is measured using a calibrated testing machine.

Key Parameters

• Screw type and size: As per design/specification.
• Withdrawal direction: Parallel to grain.
• Specimen preparation: Edge fixed firmly; no movement during test.

Typical Formula for Screw Withdrawal Resistance (P)

[ P = F / L ] Where:

• (P) = Withdrawal resistance per unit length (N/mm)
• (F) = Maximum force to withdraw screw (N)
• (L) = Length of screw embedded in wood (mm)

Important Notes

• Test specimens failing due to mechanical errors must be discarded (Clause 3.2).
• The knife test (Part 14) is for glue adhesion, not screw withdrawal.
• For screw withdrawal, ensure screws are inserted correctly and specimens are conditioned as per IS 4020 Part 1.

Summary Table for Screw Withdrawal Resistance (Typical Values)

(Values indicative; refer to specific IS or manufacturer data)

flowchart LR
    A[Prepare Specimen] --> B[Fix specimen edge against batten]
    B --> C[Insert screw parallel to grain]
    C --> D[Apply withdrawal force using testing machine]
    D --> E[Record maximum force before screw withdrawal]
    E --> F[Calculate withdrawal resistance P = F/L]

For precise screw withdrawal resistance requirements, consult the detailed IS 4020 parts or relevant structural timber standards.