Resin Treated Compressed Wood Laminates (Compregs) - Specification, Part 4: Sampling and tests
1966 Edition

Overview of IS 3513 Part 4 - Introduction and Key Details

Data Rounding (Clause 0.6)

• All final test or analytical results must be rounded according to IS 2:1960 guidelines.
• Maintain the same number of significant digits as indicated in the standard.

Comparative Tracking Index (CTI) Test via Yarsley and Ives Method (Clause 3.5.3.3)

• Electrolyte composition:
  • 0.1 ± 0.002% ammonium chloride or
  • 0.25% sodium chloride dissolved in distilled water.
• Drop weight: Between 0.241 and 0.242 grams; drop diameter approximately 20 ± 5 mm.
• Drop interval: One drop every 8 seconds.
• Electrodes used: Brass or tungsten.
• Electrode spacing: 4 ± 0.1 mm.

CTI Test Parameters Summary

Additional Remarks

• The standard encompasses a broad spectrum of testing methods for civil engineering materials.
• The rounding and testing protocols ensure consistency and reproducibility across different laboratories.

flowchart LR
    A[Prepare Electrolyte Mixture] --> B[Adjust Drop Weight and Size]
    B --> C[Set Drop Frequency to One per 8 Seconds]
    C --> D[Configure Electrodes and Spacing]
    D --> E[Execute CTI Testing Procedure]

This summary aligns with the introductory and procedural essentials of IS 3513 Part 4.

IS 3513 Part 4 - Scope Overview

This part of IS 3513 (1966) specifies the requirements related to steel wire ropes utilized in various engineering sectors.

Scope Highlights:

• Applicable to steel wire ropes intended for hoisting, pulling, and mechanical operations.
• Details on dimensions, construction, breaking strength, and testing protocols.
• Ensures compliance with safety and operational standards.

Key Specifications:

• Rounding off results: Final measured or calculated values must adhere to IS 2-1960 rounding rules.
• The number of significant digits in results must correspond to those in the standard's specified figures.

Typical Parameters Covered:

Approximate Breaking Load Calculation:

[ P_b = A \times \sigma_b ]

Where:

• (P_b) = Breaking load in Newtons
• (A) = Total cross-sectional area of wires in mm8
• (\sigma_b) = Tensile strength of the wire material in N/mm8

flowchart LR
    A[Steel Wire Rope] --> B[Construction Details]
    A --> C[Dimensional Specifications]
    A --> D[Breaking Load Requirements]
    A --> E[Testing Procedures]
    E --> F[Rounding as per IS 2-1960]

Summary: IS 3513 Part 4 delineates standards for steel wire ropes, emphasizing construction, strength, and rigorous testing with adherence to IS 2-1960 rounding rules.

IS 3513 Part 4: Sampling Guidelines

• Sampling Methodology: Samples should be randomly selected from each batch to guarantee representativeness.

• Definition of Batch: A batch refers to a quantity of material produced under uniform manufacturing conditions.

• Sample Quantity: Determined following Table 1 (not fully included here), which correlates the number of samples to batch size.

Example Sampling Table Format:

Sampling Approach:

• Employ random selection to minimize bias.
• Ensure samples accurately represent the entire batch.
• Properly label and store each sample for subsequent testing.

For precise figures from Table 1, please consult the full IS 3513 Part 4 document. Proper sampling is crucial to reliably reflect batch quality.

IS 3513 Part 4: Sampling and Testing Overview

1. Sample Collection (Clause 2.1)

• Random sampling from the batch is mandatory.
• Sample size and frequency are specified in Table 1 (details not provided here).

2. Example Sampling Table

3. Common Tests Include:

• Physical tests: Verification of dimensions, weight, and visual defects.
• Mechanical tests: Assessment of tensile strength and hardness.
• Chemical tests: Composition analysis.
• Durability tests: Examination of corrosion resistance and weathering effects.

4. General Testing Guidelines

• Samples must be representative of the batch.
• Tests should conform to relevant IS standards applicable to the material or product.
• Results must meet predefined acceptance criteria.

For detailed sampling tables or specific test procedures, refer to the full IS 3513 Part 4 documentation or specify the material type.

IS 3513 Part 4: Guidelines for Specimen Preparation

• Specimen Dimensions:

  • Clause 3.5.3.1: Smaller specimens for specific tests measure 7.5 × 7.5 cm, varnished.
  • Clause 3.1.1: Standard specimen size is 40 × 40 × 12 mm.
    • For thickness under 12 mm: use the full thickness.
    • For thickness over 12 mm: equal numbers of specimens from both surfaces.
    • For thickness exceeding 20 mm: three groups taken from surface 1, surface 2, and the core.
  • Clause 3.2.1: Specimens for bending or compression tests should be full thickness and approximately 300 × 100 mm or the width of the board, whichever is smaller.

• Specimen Sets (Clause 3.3.1):

  • Three sets are prepared for impact, bending, and compression tests.
  • Each set contains 12 specimens: 3 blanks (controls) and 9 divided into 3 groups of 3 specimens each.
  • Compression specimens are initially 25 mm longer on each edge before final trimming.

Specimen Dimension Summary

This preparation process ensures specimens represent the material accurately for mechanical testing according to IS 3513 Part 4 and IS 1708-1960.

IS 3513 Part 4: Physical Test Requirements

Specimen Preparation (Clause 3.3.1)

• Prepare three distinct sets of specimens for:
  • Impact testing
  • Bending evaluation
  • Compression assessment
• Each set consists of 12 specimens:
  • 3 control samples (blanks)
  • 9 test specimens divided into 3 groups of 3 each
• Compression test specimens must initially be 25 mm longer on each side before final sizing.

Relevant Testing Standard

• Specimens and tests should comply with IS 1708:1960 requirements.

Summary Table for Physical Tests

Additional Notes

• Uniform specimen preparation is critical.
• Control specimens provide baseline reference values.
• Grouping allows statistical reliability in results.

For detailed formulas or test methods for impact, bending, or compression, please specify.

IS 3513 Part 4: Mechanical Testing Overview

1. Test Specimen Details (Clauses 3.2.1 & 3.3.1)

• Dimensions:
  • Length: Approximately 300 mm
  • Width: 100 mm or board width, whichever is smaller
  • Thickness: Full thickness of the laminate
• Specimen Sets: Three sets for impact, bending, and compression tests
• Specimens per Set: 12 total
  • 3 control blanks
  • 9 test specimens divided into 3 groups of 3
• Compression specimens: Initially 25 mm longer on each side, trimmed before testing

2. Sampling Protocol (Clause 2.1)

• Samples must be randomly drawn from the batch, with numbers per Table 1 (refer IS 3513 Part 4 for details)

3. Rounding Requirements (Clause 0.6)

• Apply IS 2-1960 for rounding off test results
• Maintain significant digits consistent with specified values

Specimen Preparation Summary

If you need calculation methods for impact energy, bending modulus, or compressive strength, please ask.

IS 3513 Part 4: Electrical Test Procedures

Key Equipment and Conditions (Clause 3.4.3)

• Use of a test transformer equipped with a voltage regulator.
• Flash test jig with electrodes spaced at 10 cm.

Test Specimen Requirements (Clause 3.4.2)

• At least half (≥50%) of electrical-grade components to undergo non-destructive electrical testing.

Results Evaluation (Clause 3.4.5)

• Component passes the test if no electrical breakdown occurs.
• Failures indicate defects; such samples must be rejected.

Yarsley and Ives Method Details (Clause 3.5.3.3)

Electrical Test Process Flow

flowchart TD
    A[Prepare Electrolyte Solution] --> B[Set Drop Weight and Diameter]
    B --> C[Adjust Drop Frequency to 1 drop/8 sec]
    C --> D[Install Electrodes and Set Spacing]
    D --> E[Conduct Electrical Stress Test]
    E --> F{Is Breakdown Observed?}
    F -- No --> G[Component Passes Test]
    F -- Yes --> H[Reject Component]

This test determines the Comparative Tracking Index (CTI), a crucial parameter for electrical insulation safety and effectiveness. For further details, consult Clauses 3.4.2, 3.4.3, 3.4.5, and 3.5.3.3.

IS 3513 Part 4 – Air Flash Test Essentials

Equipment Setup (Clause 3.4.3)

• Test transformer with voltage regulator.
• Flash test jig with electrodes spaced at 10 cm.

Test Sample (Clause 3.4.2)

• Test at least 50% of electrical grade units.
• This test is non-destructive.

Test Execution (Clause 3.4.4)

• Place the component on the electrode jig.
• Apply a stress voltage of at least 4 kV/cm over the 10 cm gap.
• The minimum voltage applied should be 40 kV.

Test Parameters Summary

flowchart LR
    A[Test Transformer + Voltage Regulator] --> B[Flash Test Jig]
    B --> C[Electrodes 10 cm Apart]
    C --> D[Component Placement]
    D --> E[Apply ≥ 40 kV Voltage]
    E --> F{Flashover Occurs?}
    F -- No --> G[Test Passed]
    F -- Yes --> H[Test Failed, Reject Material]

This test validates the electrical insulation integrity of components under high-voltage stress conditions.

Tracking Time Evaluation for Varnish-Finished Electrical Components (IS 3513 Part 4)

Reference Standards:

• Primary Method: IS 2824-1964 for comparative tracking index testing of solid insulating materials.
• Alternative Method: Yarsley and Ives technique as per Clause 3.5.3.3.

Yarsley and Ives Method Specifications (Clause 3.5.3.3):

Overview:

• The test involves applying electrolyte droplets between electrodes on the varnished surface.
• The time taken until electrical tracking (surface breakdown) occurs is recorded as the tracking time.
• The IS 2824-1964 method is preferred, but alternate procedures like the Yarsley and Ives method are accepted when specified.

flowchart TD
    A[Initiate Test] --> B[Prepare Electrolyte Solution]
    B --> C[Set Electrode Spacing: 4 ± 0.1 mm]
    C --> D[Adjust Drop Weight: 0.241-0.242 g]
    D --> E[Set Drop Interval: 1 drop per 8 seconds]
    E --> F[Apply Drops Between Electrodes]
    F --> G{Tracking Detected?}
    G -- No --> F
    G -- Yes --> H[Record Tracking Time]
    H --> I[Conclude Test]

Note: Always refer to IS 2824 for comprehensive methodology and ensure compliance with purchaser requirements.

Impact of Surface Contamination on Carbon Tracking (IS 3513 Part 4)

Key Clause Summaries:

• Clause 3.5.1: Evaluates how surface contaminants affect carbon track formation by applying an electrolytic solution between electrodes under electrical stress.

• Clause 3.5.2: Specifies that tracking time determination follows IS 2824-1964, which covers varnished compreg materials.

• Clause 3.3: Addresses chemical resistance, linking contamination effects to chemical durability.

• Rounding (Clause 0.6): Test results must be rounded per IS 2-1960 rules with matching significant digits.

Typical Test Setup (per IS 2824-1964):

• Electrode spacing: 2.5 mm (or as specified).
• Electrolyte (e.g., NaCl solution) applied in drops.
• Applied voltage: generally 500 V AC.
• Measure the time until carbon tracking causes failure.

Key Parameter:

[ T = \text{Time until carbon track formation (minutes)} ]

Parameter Summary

flowchart LR
    A[Begin Test] --> B[Apply Electrolytic Solution Drop]
    B --> C[Apply Voltage Across Electrodes]
    C --> D[Monitor for Carbon Track Formation]
    D -->|Track Detected| E[Record Tracking Time]
    D -->|No Track| B

Summary: IS 3513 Part 4 utilizes IS 2824-1964 procedures to assess how surface contamination accelerates carbon tracking, emphasizing tracking duration under controlled electrolytic and electrical conditions.

IS 3513 Part 4 (1966) – Standard Procedure for Tracking Time Measurement

Highlights from Clauses 3.5.1.1 & 3.5.2:

• Tracking time is defined as the duration a varnish-finished compreg withstands electrical tracking.
• The standard testing method follows IS 2824-1964, focused on small clear timber specimens.
• This method is preferred unless the purchaser requests an alternative.
• An alternate approach is described in Clause 3.5.3 (not elaborated here).

Summary of IS 2824-1964 Method:

Procedure Outline:

1. Prepare varnished compreg specimens as per IS 3513.
2. Apply the designated voltage across the specimen.
3. Record the time until electrical tracking occurs.
4. Document tracking time for quality evaluation.

flowchart LR
    A[Specimen Preparation] --> B[Voltage Application]
    B --> C{Tracking Occurred?}
    C -- No --> B
    C -- Yes --> D[Record Tracking Time]

Note: For exact specimen sizes, voltage levels, and environmental settings, consult IS 2824-1964 and IS 3513 Part 4 tables.

IS 3513 Part 4 (1966) – Alternative Procedure for Tracking Time

Summary of Clause 3.5.3:

• Provides an alternate testing method to the standard IS 2824-1964 approach.
• Applicable when the purchaser specifies deviations from the standard method.
• Utilizes specialized equipment such as:
  • Yarsley and Ives apparatus
  • AEI comparator

Alternate Method Overview:

Notes:

• This method lacks detailed description in IS 3513; refer to equipment manuals.
• The standard IS 2824-1964 method is recommended unless otherwise directed.
• Tracking time is critical for assessing electrical insulation durability.

flowchart LR
    A[Initiate Test] --> B[Prepare and Varnish Specimen]
    B --> C[Set up Tracking Equipment]
    C --> D[Apply Electrical Stress]
    D --> E{Tracking Detected?}
    E -- No --> D
    E -- Yes --> F[Record Tracking Time]
    F --> G[End Testing]

For comprehensive procedures, consult IS 2824-1964 and apparatus-specific documentation.

IS 3513 Part 4: Guidelines for Test Result Interpretation

Critical Clauses and Criteria

• Electrical Testing (Clause 3.4.5):

  • A specimen passes if no electrical breakdown occurs during testing.
  • Failure is indicated by any breakdown or visible flaws, warranting rejection.

• Mechanical Testing (Clause 3.2.3):

  • Failure criteria include delamination, blistering, or tensile strength less than 70% of the minimum specified.

• Rounding of Results (IS:2-1960):

  • Final values must be rounded to match the significant figures of the standard's specified values.

Interpretation Summary Table

Notes

• Test and sampling procedures must strictly follow Part IV of IS 3513.
• Proper rounding as per IS:2-1960 is essential for reporting.
• Reject any specimen exhibiting material defects under load.

flowchart TD
    A[Sample Specimen] --> B{Electrical Test}
    B -- No Breakdown --> C[Pass]
    B -- Breakdown or Defects --> D[Fail & Reject]
    A --> E{Mechanical Test}
    E -- Meets Strength & Integrity --> C
    E -- Fails Criteria --> D

This framework ensures consistent evaluation of results in line with IS 3513 Part 4.

IS 3513 Part 4: Reporting and Compliance Essentials

1. Rounding Rules (Clause 0.6):

   • All final test or analytical data should be rounded following IS 2:1960.
   • The number of significant digits retained must align with those specified in the standard.

2. Comparative Tracking Index Test Details (Clause 3.5.3.3):

   • Electrolyte: 0.1 ± 0.002% ammonium chloride or 0.25% sodium chloride in distilled water.
   • Drop Weight: 0.241 to 0.242 grams with drop diameter around 20 ± 5 mm.
   • Drop Frequency: One drop every 8 seconds.
   • Electrodes: Brass or tungsten.
   • Electrode Gap: 4 ± 0.1 mm.

3. Compliance Verification:

   • Final values, after rounding as per IS 2:1960, are compared with standard requirements to determine conformity.

Summary Table – Yarsley and Ives Method Parameters

Compliance Workflow

flowchart TD
    A[Test/Analysis] --> B[Observe or Calculate Value]
    B --> C[Round Value per IS 2:1960]
    C --> D{Compare with Standard Limits}
    D -->|Complies| E[Accept Result]
    D -->|Non-compliant| F[Reject or Repeat Test]

Note: Refer to Part IV of IS 3513 for detailed sampling and testing protocols.