Code of practice for the preparation and application of putty for repairing plywood and other wood-based panels

IS 12053: Scope & Key Specifications Summary

Scope:
IS 12053 covers the preparation, properties, and testing of Nitrocellulose based putty used for wood finishing.

Key Formulas & Tables

1. Preparation of Nitrocellulose Putty (Clause 5.1)

• Mixing Process:
  Acetone + Methanol → add Nitrocellulose (20 Sec then 1/2 Sec) with stirring → add fillers (Gypsum, Talc, China clay, Wood flour) → mix to homogeneous paste → store airtight.

• Pot Life: ~1 week.

2. Colouring of Putty

• Use mineral pigments: raw sienna, burnt sienna, turkey amber, ferric oxide, titanium dioxide, zinc oxide.
• Pigments mixed with putty + wood flour for color and texture → store sealed.

Additional Notes

• Setting Time (Clause 2.2): Time for putty to form a cohesive mass meeting requirements.
• Rounding Off (Clause 0.3): Final values rounded per IS 2-1960, matching significant digits of specified values.

This summary helps ensure compliance with IS 12053 for nitrocellulose putty preparation and testing.

IS 12053: Definitions & Key Specifications

1. Rounding Off (Clause 0.3)

• Final test or analysis values must be rounded per IS 2:1960.
• Retain the same number of significant figures as specified in the standard.

2. Setting Time (Clause 2.2)

• Time taken for putty to become a cohesive mass meeting requirements after a specified period.

3. Nitrocellulose Putty Formulation (Clause 5.1)

• Preparation: Mix acetone & methanol → add nitrocellulose types slowly with stirring → add fillers (gypsum, talc, china clay, wood flour) → mix to homogeneous paste.
• Storage: Airtight container; pot life ~1 week.

4. Colouring of Putty

• Use mineral pigments: raw sienna, burnt sienna, turkey amber, ferric oxide, titanium dioxide, zinc oxide.
• Pigments mixed with putty and wood flour; stored in sealed containers.

flowchart TD
    A[Mix Acetone + Methanol] --> B[Add Nitrocellulose 20 Sec]
    B --> C[Add Nitrocellulose 1/2 Sec]
    C --> D[Add Gypsum, Talc, China Clay, Wood Flour]
    D --> E[Mix to Homogeneous Paste]
    E --> F[Store in Airtight Container (Pot life ~1 week)]
    F --> G[Add Pigments + Wood Flour for Colouring]
    G --> H[Store Coloured Putty in Sealed Container]

This summarizes key definitions and preparation guidelines per IS 12053.

IS 12053: Key Requirements for Nitrocellulose Putty

1. Rounding Off Values (Clause 0.3)

• Final test/analysis values must be rounded per IS 2-1960.
• Retain the same significant figures as specified in the standard.

2. Putty Preparation (Clause 5.1)

a) Ingredients & Proportions for Nitrocellulose Putty

• Mixing Process: Acetone + Methanol → Add Nitrocellulose 20 Sec → Add Nitrocellulose 1/2 Sec → Add fillers → Mix to homogeneous paste.
• Store in airtight container; pot life ≈ 1 week.

b) Colouring of Putty

• Use mineral pigments: raw sienna, burnt sienna, turkey amber, ferric oxide, titanium dioxide, zinc oxide.
• Wood flour or sand can reduce pigment quantity.
• Mix pigments + wood flour with putty; store sealed.

3. Fillers/Extenders (Clause 4.4)

• Fillers sizes as per Clause 5.1(a).
• Extenders must comply with IS 1508-1972.

4. Setting Time (Clause 2.2)

• Defined as time for putty to become cohesive and meet requirements.

flowchart LR
    A[Acetone + Methanol] --> B[Add Nitrocellulose 20 Sec]
    B --> C[Add Nitrocellulose 1/2 Sec]
    C --> D[Add Fillers: Gypsum, Talc, China Clay, Wood Flour]
    D --> E[Mix to Homogeneous Paste]
    E --> F[Store Airtight - Pot Life ~1 Week]
   

IS 12053: Key Material Formulations for Putty

1. Nitrocellulose Putty (Clause 5.1)

• Solvent mix:

  • Acetone: 80 parts
  • Methanol: 40 parts

• Putty ingredients (parts by weight):

  Ingredient	Range
  Nitrocellulose 20 Sec	15
  Nitrocellulose 1/2 Sec	20
  Gypsum (45 microns)	60 - 90
  Talc powder (45 microns)	60 - 90
  China clay (45 microns)	20 - 30
  Wood flour (75 microns)	15 - 20

• Process: Mix acetone & methanol → add nitrocellulose slowly → add fillers → mix to smooth paste → store airtight (pot life ~1 week).

• Colouring: Use mineral pigments like raw sienna, ferric oxide, titanium dioxide, zinc oxide, mixed with putty and wood flour.

2. Urea-Formaldehyde (UF) Putty (Clause 5.2)

• Putty base ingredients (parts by weight):

  Ingredient	Quantity
  UF resin powder	100
  Wood flour (75 microns)	40
  Talc powder (45 microns)	100
  China clay (45 microns)	100
  Acetone	120 - 130

• Catalyst addition: 2 ml of 20% ammonium chloride per 100 parts putty base (pot life ~2 hours).

• Colouring: Same pigments as Nitrocellulose putty.

3. UF Resin Modified with PVAc Putty (Clause 5.3)

• Formulation I & II (parts by weight):

  Ingredient	I	II
  UF resin powder	100	-
  Water	100	-
  UF resin (50% solids)

IS 12053: Preparation of Putty — Key Formulations & Specifications

1. Nitrocellulose Putty (Clause 5.1)

• Ingredients for Putty Base:

• Colouring: Use mineral pigments like raw sienna, ferric oxide, titanium dioxide, etc.
• Pot life: ~1 week.

2. Urea-Formaldehyde (UF) Putty (Clause 5.2)

• Putty Base Ingredients:

• Colouring: Mineral pigments + wood flour.
• Catalyst Addition: 2 ml of 20% ammonium chloride per 100 parts putty base.
• Pot life: ~2 hours after catalyst addition.

3. UF Resin Modified with PVAc Emulsion (Clause 5.3)

IS 12053: Method of Application for Putty

Clause 6.1 - Application Steps:

• Transfer a small quantity of putty of the required color onto the repair surface quickly.
• Use a flexible metallic knife to force putty into gaps or defects.
• Allow the applied putty to dry undisturbed.
• Scrape off excess putty with a scraper.
• Sand the surface smooth after drying.

Key Specifications for Putty Application

Summary of Putty Formulations (for context)

• Nitrocellulose Putty: Acetone + Methanol + Nitrocellulose + Fillers (gypsum, talc, china clay, wood flour).
• Urea-Formaldehyde Putty: UF resin powder + wood flour + talc + china clay + acetone + catalyst (ammonium chloride).
• UF Resin Modified with PVAc: UF resin powder or resin + PVAc emulsion + ammonium salts + tamarind seed powder.

Pot Life

• Nitrocellulose and UF resin putties: ~1 week (without catalyst).
• UF putty with catalyst: ~2 hours.

flowchart TD
    A[Transfer Putty] --> B[Force into Gaps with Knife]
    B --> C[Allow to Dry Undisturbed]
    C --> D[Scrape Off Excess]
    D --> E[Sand Surface Smooth]

Note: Proper mixing, timely application, and curing are critical for durable repairs per IS 12053.

IS 12053: Quality Control & Testing - Key Formulas & Specifications

1. Rounding Off Test Results

• Follow IS 2-1960 for rounding off final test values.
• Retain the same number of significant digits as in the specified standard value.

2. Nitrocellulose Putty Formulation (Clause 5.1)

• Mix acetone + methanol → add nitrocellulose (20 Sec then 1/2 Sec) → add powders → homogeneous paste.
• Pot life: ~1 week.
• Colouring: Use mineral pigments like ferric oxide, titanium dioxide, zinc oxide.

3. Urea-Formaldehyde (UF) Putty Formulation (Clause 5.2)

• Mix powders → add acetone → stir → putty base (pot life ~1 week).
• Colouring: Same mineral pigments as Nitrocellulose putty.
• Catalyst addition: Add 2 ml of 20% ammonium chloride per 100 parts putty base → pot life ~2 hours.

Summary:

• Pot life: Nitrocellulose putty ~1 week; UF putty base ~1 week; UF putty after catalyst ~2 hours.
• Pigments: Raw sienna, burnt sienna, turkey amber, ferric oxide, TiO₂, ZnO.
• Particle sizes: Gypsum, tal

IS 12053: Storage and Handling - Key Specifications & Formulations

1. Storage & Pot Life

• Putty prepared must be stored in airtight/sealed containers.
• Pot life:
  • Nitrocellulose putty: ~1 week
  • UF resin putty base: ~1 week
  • UF putty with catalyst: ~2 hours

2. Formulations

3. Colouring

• Use mineral pigments: Raw sienna, Burnt sienna, Turkey amber, Ferric oxide, Titanium dioxide, Zinc oxide.
• Pigment quantity can be reduced by adding sand, dust, or wood flour.

Summary Table: Putty Preparation Stages

Important Notes

• Follow IS:2-1960 for rounding off test values.
• Use heavy-duty, dust-proof, flame-proof stirrers for mixing solvents and powders.

flowchart TD
    A[Start: Ingredients] --> B[Mix Solvents]
    B --> C[Add Nitrocellulose or UF Resin]
    C --> D[

IS 12053 focuses on the preparation of nitrocellulose-based putty, but explicit safety precautions are not detailed in the provided clauses. However, based on standard practice and the chemical nature of the ingredients, key safety guidelines include:

Safety Precautions for Nitrocellulose Putty Preparation

• Use flame-proof and dust-proof motors to avoid ignition (as acetone and methanol are highly flammable).
• Work in a well-ventilated area to prevent inhalation of volatile organic compounds (VOCs).
• Use personal protective equipment (PPE): gloves, goggles, and masks.
• Store putty in airtight containers to prevent solvent evaporation and reduce fire risk.
• Avoid open flames and sparks near the mixing area.
• Maintain proper disposal of waste solvents and residues as per hazardous waste norms.

Key Formulation Table (Clause 5.1a)

Summary Diagram: Safety & Preparation Flow

flowchart TD
    A[Start: Prepare solvents] --> B[Mix Acetone & Methanol]
    B --> C[Add Nitrocellulose 20 Sec slowly]
    C --> D[Add Nitrocellulose 1/2 Sec]
    D --> E[Stir till homogeneous]
    E --> F[Add Gypsum, Talc, China Clay, Wood Flour]
    F --> G[Mix to smooth paste]
    G --> H[Store in airtight container]
    style B fill:#f9f,stroke:#333,stroke-width:2px
    style H fill:#bbf,stroke:#333,stroke-width:2px

Note: Follow IS 2-1960 for rounding test results as per Clause 0.3.

For detailed safety, refer to MSDS of each chemical and general

IS 12053 - Annexures & Formulations Summary

1. Nitrocellulose Putty (Clause 5.1)

• Preparation: Mix acetone & methanol, add nitrocellulose with stirring, then add fillers for a homogeneous paste.
• Colouring: Use pigments like raw sienna, ferric oxide, titanium dioxide, etc.

2. Urea-Formaldehyde (UF) Putty (Clause 5.2)

• Colouring: Similar pigments as Nitrocellulose putty.
• Catalyst Addition: Add 2 ml of 20% ammonium chloride per 100 parts putty base; pot life ~2 hours.

3. UF Resin Modified with PVAc Emulsion Putty (Clause 5.3)