Animal Glue For General Wood-Working Purposes -Specification

IS 852: Scope & Key Specifications

• Scope: IS 852 covers testing methods and specifications for adhesives like sheet and cake glue used in structural applications, ensuring quality and compliance.

Key Points from the Code:

• Sampling (Clause 4.2 & Table 1):
  For consignment sampling of sheet and cake glue:

• Rounding Off (IS 2:1960 Rule 8):
  Final test values must be rounded off to the same decimal places as specified in the standard.

• Test Piece Dimensions (Clause 25.01.3):

  • Thickness: 20 mm rubber
  • Clamping device eccentricity: 6 mm
  • Locating pegs: 10 mm

• Specimen Preparation:
  Test pieces must be removed from clamps and exposed to air for ≥ 24 hours before testing.

Summary Diagram: Sampling Process

flowchart TD
    A[Consignment Received] --> B{No. of Containers?}
    B -->|1-5| C[Sample 1 Container]
    B -->|6-50| D[Sample 5 Containers]
    B -->|51-100| E[Sample 10 Containers]
    B -->|101-500| F[Sample 15 Containers]
    B -->|501-1000| G[Sample 20 Containers]

This ensures representative testing for adhesive quality control per IS 852.

IS 852 Key References and Specifications

• Rounding Off Values (per IS 2:1960, Rule 8):

  • Final test or analysis results must be rounded to the same decimal places as the specified value in the standard.

• Dimensions:

  • All dimensions are in millimetres (mm).
  • Typical thicknesses and clearances:
    • Rubber thickness: 20 mm
    • Eccentricity: 6 mm
    • Locating pegs: 10 mm

• Sampling Table for Sheet and Cake Glue (Clause 4.2):

• Testing Preparation:
  • Test pieces should be exposed to air for at least 24 hours after removal from clamps before testing.

flowchart LR
    A[Consignment Size] --> B[Determine Sample Size]
    B --> C{No. of Containers}
    C -->|1 to 5| D[Sample 1 Container]
    C -->|6 to 50| E[Sample 5 Containers]
    C -->|51 to 100| F[Sample 10 Containers]
    C -->|101 to 500| G[Sample 15 Containers]
    C -->|501 to 1000| H[Sample 20 Containers]

This ensures representative sampling and consistent test procedures per IS 852.

IS 852 - Key Requirements Summary

1. Rounding Off (Clause None):

   • Final test or analysis results must be rounded per IS 2:1960 Rule 8.
   • Retain decimal places equal to those specified in the standard.

2. Sampling of Sheet and Cake Glue (Clause 4.2, Table 1):

   No. of Containers in Consignment	No. of Containers to be Sampled
   1 to 5	1
   6 to 50	5
   51 to 100	10
   101 to 500	15
   501 to 1000	20

3. Specimen Preparation (Clause 3.1):

   • Final specimens prepared per Annex A from selected samples (Clauses 4.2-4.4).
   • Tests per Clauses 3.3 to 3.8 applied to these specimens.

4. Test Piece Dimensions & Fixtures (Clause 25.01.3 & Figures):

   • Rubber thickness: 20 mm
   • Clamping eccentricity: 6 mm
   • Locating pegs: 10 mm
   • Specimens exposed to air for ≥ 24 hours before testing.

Summary Diagram: Sampling & Testing Flow

flowchart TD
    A[Consignment] --> B[Sampling per Table 1]
    B --> C[Prepare Final Specimens (Annex A)]
    C --> D[Condition Specimens ≥ 24 hrs]
    D --> E[Perform Tests (Clauses 3.3 - 3.8)]
    E --> F[Round results per IS 2:1960]

This ensures representative sampling, proper specimen preparation, and consistent test results reporting.

IS 852 - Sampling Key Points

Sampling Quantities (Clause 4.2, Table 1)

Sample Increment (Clause 4.2.1.1)

• Each increment must include whole or equal proportions of at least 4 sheets/cakes.
• Must represent the entire container's contents.

Powdered, Pearl, Cube, Granulated Glue (Clause 4.3)

• Sample in the same proportions as sheet and cake glue.
• Use a sampling tube/scoop to collect from top, middle, and bottom of container.

Rounding Off (IS 2:1960)

• Final test values should be rounded as per Rule 8 of IS 2:1960.
• Decimal places retained should match the specified value precision.

flowchart LR
    A[Consignment] --> B[Select Containers as per Table 1]
    B --> C[Take Sample Increments]
    C --> D[4 sheets/cakes per increment]
    D --> E[Combine for Representative Sample]
    F[Powdered/Granulated Glue] --> G[Sample same proportions]
    G --> H[Use sampling tube from top, middle, bottom]

This ensures representative sampling for quality testing as per IS 852.

IS 852: Key Instructions for Use (Summary)

• Overlap (Clause 25.01.3):
  Test pieces should have specified overlaps with all dimensions in millimetres. Refer to Fig. 1 for test piece details with a 20 mm thick rubber layer.

• Clamping Device (Fig. 2):

  • Eccentricity: 6 mm
  • Locating pegs: 10 mm
    Used to hold test pieces securely during testing.

• Wooden Jig (Fig. 3):
  Used for precise locating of test pieces in the clamp.

• Conditioning:
  Test pieces must be removed from the clamp and exposed to air for not less than 24 hours before testing.

• Glue Concentration (Clause 2.2):
  Use a glue concentration of 10 g glue to 15 ml water, unless otherwise agreed.

• Rounding Off (IS 2:1960):
  Final test values must be rounded off following IS 2:1960, maintaining the same decimal places as specified.

Typical Test Piece Preparation Flow (Mermaid Diagram)

flowchart TD
    A[Prepare Glue Solution] --> B[Prepare Test Pieces]
    B --> C[Overlap & Assemble Pieces]
    C --> D[Clamp Using Device]
    D --> E[Remove & Air Dry (≥24 hrs)]
    E --> F[Conduct Test]

This ensures consistent and reproducible test results per IS 852.

IS 852: Marking and Packaging Key Points

Marking (Clause 7.1 & 7.2)

• Each batch bag of animal glue must be legibly and indelibly marked with:
  • Source of manufacture
  • Description of material
  • Year of manufacture
  • Batch number
• Bags may also carry the BIS Standard Mark (Clause 7.2).

Sampling (Clause 4.2 & 4.4)

• Sampling of containers for Sheet, Cake, Flake, and Kibbled glues follows Table 1:

• For Flake and Kibbled glues, take 0.5 kg samples from each selected container.

Packaging (Clause 5)

• Glue shall be packed in suitable quantities agreed upon by purchaser and supplier.
• Typical packaging: Gunny bags with alkathene liners to ensure protection and durability.

flowchart TD
    A[Manufacture] --> B[Marking on Batch Bag]
    B --> C[Source, Material, Year, Batch No.]
    C --> D[Packaging]
    D --> E[Gunny bag + Alkathene liner]
    E --> F[Sampling]
    F --> G[Sample containers as per Table 1]

This ensures traceability, quality control, and safe transportation/storage.

IS 852: Testing Methods Key Points

• Specimen Preparation (Clause 3.1 & Annex A):
  Final test specimens must be prepared per Annex A from selected samples (Clauses 4.2-4.4). These specimens undergo tests (Clauses 3.3-3.8) for compliance.

• Specimen Conditioning:
  After clamping, specimens are removed and exposed to air for ≥ 24 hours before testing to stabilize conditions.

• Test Piece Dimensions (Clause 25.01.3):

  • Rubber thickness: 20 mm
  • Clamp eccentricity: 6 mm
  • Locating pegs: 10 mm
  • All dimensions in millimetres.

• Rounding Off (General Clause):
  Test results must be rounded per IS 2:1960 Rule 8, matching decimal places of specified values.

Typical Testing Setup (Simplified)

flowchart LR
    A[Sample Preparation] --> B[Clamping Device]
    B --> C[Conditioning: 24 hrs air exposure]
    C --> D[Testing (Pulling, Shear, etc.)]
    D --> E[Result Recording & Rounding]

Summary Table: Test Piece Dimensions

For detailed specimen preparation, refer to Annex A of IS 852.

IS 852: Preparation of Glue Specimen - Key Points

1. Glue Preparation (Clause F-2.1 & F-2.2)

• Weigh 10 g of glue powder.
• Add 15 ml cold distilled water (unless otherwise agreed).
• Soak at 25 ± 2°C for 3 hours with a watch glass cover.
• Heat in water bath at max 70°C for 15 minutes, keeping solution below 60°C.
• Stir gently to ensure complete dissolution.

2. Test Piece Preparation (Clause 25.0)

• Use two slips of rotary cut veneer from Canarium spp., Vateria indica, or Shorea assamica.
• Dimensions per slip:
  • Length: 115 mm
  • Width: 25.0 ± 0.3 mm
  • Thickness: 3.15 ± 0.15 mm
• Overlap joint: 25.0 ± 0.3 mm
• Veneer face: smooth cut on at least one face.
• Grain inclination: not steeper than 1 in 9, no obvious grain inclination through thickness.
• Free from defects: knots, splits, whorls, etc.
• Moisture content at gluing: 12.0 ± 2.5%.

Summary Table

IS 852: Determination of Keeping Qualities of Glue

Key Points from Annex B (Clause 3.3)

• Keeping Quality Definition: Glue must keep for at least 6 days without signs of liquefaction, putrefaction, or mold.
• Test Method: Observe the glue sample daily for:
  • Liquefaction
  • Putrefaction
  • Mold growth
• Record the time in days until any of these occur.

Sampling (Clause 4.2, Table 1)

• Samples must represent various parts of the consignment for uniformity.

Moisture Content Specimen (Clause 2.1.1)

• Take a separate specimen before grinding for moisture tests.
• Powder by hand or cut with scissors to avoid moisture loss.

flowchart LR
    A[Consignment of Glue] --> B[Sampling as per Table 1]
    B --> C[Separate specimen for moisture test]
    B --> D[Keep samples for keeping quality test]
    D --> E[Observe daily for 6+ days]
    E -->|No liquefaction/putrefaction/mold| F[Pass]
    E -->|If any signs appear before 6 days| G[Fail]

This ensures glue quality and shelf-life compliance as per IS 852.

IS 852: Determination of Moisture Content (Clause 3.5 & Annex C)

Procedure Summary:

• Sample preparation: Break glue, sieve through 2.00 mm IS sieve.
• Sample size: Weigh 1 g powder into a tared stainless steel dish (70 mm dia, 15 mm high, ≥20 g mass).
• Add 10 ml distilled water, soak, then heat on water bath until water mostly evaporates.
• Drying: Place dish in oven at 103 ± 2°C for 2 hours without opening door.
• Temperature control: Thermometer bulb 12 mm above dish center; 105°C mark about 50 mm above oven top.
• Weighing: Cool in desiccator, weigh, reheat for 30 min, cool, and reweigh. Repeat until mass change ≤ 1 mg.

Moisture Content Calculation:

[ \text{Moisture Content (%)} = \frac{\text{Loss in mass}}{\text{Initial mass}} \times 100 ]

Moisture Limits:

• Average moisture content ≤ 14% (max 18% allowed).
• If moisture content exceeds limits, supplier adjusts delivered mass:

[ \text{Adjusted mass delivered} = N \times \left(1 - \frac{M}{100}\right) ]

Where:

• (N) = nominal mass ordered
• (M) = average moisture content (%)

Notes:

• Prevent moisture absorption during weighing.
• Use electrically heated oven with thermostatic control.

flowchart TD
    A[Sample Preparation] --> B[Weigh 1g powder]
    B --> C[Add 10 ml distilled water]
    C --> D[Heat on water bath]
    D --> E[Dry in oven at 103±2°C for 2 hrs]
    E --> F[Cool in desiccator and weigh]
    F --> G{Mass change ≤ 1 mg?}
    G -- No --> E
    G -- Yes --> H[Calculate moisture content]

This ensures accurate moisture determination as per IS 852 standards.

IS 852: Determination of Chlorides (Annex D, Clause 3.6)

Procedure Summary:

• Weigh 5 g powdered specimen.
• Soak in 10 ml cold distilled water for 1 hour.
• Heat on water bath until dissolved.
• Add 5 g pure lime, dry, and ignite to remove organics.
• Boil residue with distilled water, transfer, and neutralize with acetic acid.
• Make volume 50-100 ml with distilled water.
• Add 1 ml potassium chromate indicator (5% solution).
• Titrate with 0.1 N AgNO₃ until first permanent color change from yellow.

Key Calculation:

[ \text{Chloride content as NaCl (%)} = \frac{V \times N \times 0.00585 \times 100}{W} ]

Where:

• ( V ) = volume of AgNO₃ used (ml)
• ( N ) = normality of AgNO₃ (0.1 N)
• ( 0.00585 ) = g NaCl equivalent to 1 mg of 0.1 N AgNO₃
• ( W ) = weight of specimen (5 g)

Specification:

• Chloride content ≤ 2% (as NaCl)

Notes:

• Use nickel/platinum basin to avoid contamination.
• Neutralization with acetic acid ensures proper titration endpoint.
• Potassium chromate acts as indicator forming red silver chromate precipitate at endpoint.

flowchart TD
    A[Weigh 5g specimen] --> B[Soak in 10 ml distilled water]
    B --> C[Heat & dissolve]
    C --> D[Add 5g lime, dry & ignite]
    D --> E[Boil residue with distilled water]
    E --> F[Neutralize with acetic acid]
    F --> G[Make volume 50-100 ml]
    G --> H[Add 1 ml potassium chromate]
    H --> I[Titrate with 0.1 N AgNO3]
    I --> J[Calculate chloride % as NaCl]

This method ensures accurate chloride determination critical for assessing corrosion risk in concrete materials.

IS 852 - Determination of Acidity and Alkalinity (pH)

Key Procedure (Annex E, Clause 3.7)

• Sample Preparation:

  • Dissolve 1 g powdered specimen in a small amount of warm, recently boiled distilled water.
  • Transfer to a stoppered, chemically-resistant glass flask.
  • Make volume up to 100 ml with boiled and cooled distilled water.
  • Shake well and cool to room temperature.

• pH Measurement:

  • Measure pH by electrical potential method, e.g., using a glass electrode.
  • Avoid CO₂ absorption during the test to prevent pH alteration.

• Approximate Method:

  • Use colorimetric methods (e.g., Lovibond or Hellige comparator) with nitrophenol indicator.
  • Specify the indicator when reporting colorimetric pH.

Summary Table of Key Points

flowchart LR
  A[Weigh 1g specimen] --> B[Dissolve in warm boiled distilled water]
  B --> C[Make volume to 100 ml with cooled distilled water]
  C --> D[Shake & cool to room temp]
  D --> E{Measurement method}
  E -->|Glass electrode| F[Measure pH electrically]
  E -->|Colorimetric| G[Use nitrophenol indicator & comparator]
  F & G --> H[Record pH value]

This ensures accurate determination of acidity/alkalinity as per IS 852 standards.

IS 852: Preparation and Testing of Overlap Joint Strength (Clause 3.8, Annex F)

Key Specifications:

• Test Specimens: 6 pieces prepared as per Annex F.
• Minimum Average Failing Load: ≥ 275 kg.
• Glue Tackiness: Surfaces must feel tacky (jellied) before assembly.
• Assembly Time: Glue application to joint closure ≤ 15 minutes.
• Clamping Pressure: ~50 kg (500 N), achieved by "finger tight" screws (Fig. 2).
• Clamping Duration: 16 to 24 hours at room temperature.
• Post-Clamping: Specimens exposed freely to air for ≥ 24 hours before testing.
• Test Piece Thickness: 20 mm rubber thickness (Fig. 1).
• Eccentricity: 6 mm (Fig. 2).
• Locating Pegs: 10 mm diameter (Fig. 2).
• Temperature Control: Avoid testing if room temp > 25 ± 2ºC to maintain tackiness.

Testing Procedure Summary:

1. Prepare 6 overlap joint specimens.
2. Apply glue, wait until tacky.
3. Assemble within 15 minutes.
4. Clamp with ~50 kg pressure using jig (Fig. 2 & 3).
5. Keep clamped 16-24 hours.
6. Remove and air-dry 24 hours.
7. Test for longitudinal shear; average failure load ≥ 275 kg.

Illustrative Diagram (Simplified):

flowchart TD
    A[Glue Application] --> B{Tacky?}
    B -- Yes --> C[Assemble Joint (≤15 min)]
    B -- No --> D[Delay Test]
    C --> E[Clamp Joint (50 kg pressure)]
    E --> F[Clamp for 16-24 hrs]
    F --> G[Air Dry 24 hrs]
    G --> H[Test for Overlap Joint Strength]
    H --> I{Avg Failure Load ≥ 275 kg?}
    I -- Yes --> J[Test Passed]
    I -- No --> K[Test Failed]

This ensures reliable and standardized overlap joint strength testing per IS 852.

IS 852: Technical Committee Composition - Key Details

Committee: Wood Products Sectional Committee, CED 20
Location: Indian Plywood Industries Research and Training Institute, Bangalore

Composition Highlights (Annex G)

• Chairman: Dr. P. M. Ganapathy (Indian Plywood Industries Research and Training Institute)
• Members: Representatives from diverse organizations including:
  • Forest Departments (e.g., Assam)
  • Plywood Manufacturers Associations (West Bengal, South India, Assam)
  • Ministry of Railways (RDSO)
  • National Test House, Calcutta
  • National Buildings Organization, New Delhi
  • Ministry of Defence (R&D, DGQA)
  • Central Building Research Institute (CSIR), Roorkee
  • Directorate General of Civil Aviation
  • Central Public Works Department
  • Directorate General of Supplies and Disposals
  • Indian Academy of Wood Science, Bangalore

Specifications & Notes

• The committee includes Chairman, Members, Alternates, and Ex-officio Members.
• Decisions and standards are finalized with inputs from these multidisciplinary experts.
• Rounding off test results follows IS 2:1960 Rule 8 for numerical values.

Table: Example Member Representation Snapshot

This multi-disciplinary committee ensures comprehensive standards development for wood products under IS 852.