Code of practice for laying epoxy resin floor toppings

IS 4631: Scope Summary & Key Specifications

Scope (Clause 2.0):
Defines terms related to epoxy resin flooring systems, focusing on chemical resistance, application, and maintenance.

Key Points:

• Chemical Resistance (Clause 11.1, Table 1):
  Epoxy flooring mixes are categorized by hardener type:
  • Amine or Amine-Adduct Hardeners
  • Polyamide Hardeners

• Chemical Resistance Ratings:

  • E: Excellent
  • G: Good
  • S: Satisfactory
  • P: Poor
  • X: Not recommended

• Maintenance (Clause 12.1.4):
  Spillage of strong solvents (acetone, trichloroethylene) must be removed immediately.

Rounding Off Results (Clause 0.5):

• Follow IS 2-1960 for rounding test/analysis results.
• Maintain the same significant figures as specified in the standard.

Summary Diagram: Epoxy Flooring Chemical Resistance

flowchart TD
    A[Epoxy Flooring Mixes]
    A --> B[Amine Hardeners]
    A --> C[Polyamide Hardeners]

    B --> D{Chemical Resistance}
    C --> E{Chemical Resistance}

    D -->|Acetic Acid| F[Satisfactory to Poor]
    D -->|Caustic Soda| G[Excellent to Satisfactory]
    E -->|Acetic Acid| H[Satisfactory to Poor]
    E -->|Hydrochloric Acid| I[Poor to Not Recommended]

IS 4631 - Definitions & Key Specifications

1. Definitions (Clause 2.0)

• Terms used in the standard are defined for clarity.
• Example:
  • Accelerator: As per IS 9197-1979, used to speed up epoxy curing.

2. Rounding Off (Clause 0.5)

• Values from tests/analysis must be rounded per IS 2-1960.
• Retain the same significant digits as specified.

3. Chemical Resistance Table (Clause 11.1)

• Epoxy flooring resistance to chemicals at 20°C varies by hardener type:

Legend:

• E = Excellent
• G = Good
• S = Satisfactory
• P = Poor

Summary Diagram: Chemical Resistance Rating

graph LR
A[Chemical] -->|Amine Hardeners| B(E/G/S/P)
A -->|Polyamide Hardeners| C(E/G/S/P)
B --> D[Rating Scale]
C --> D
D --> E[Excellent]
D --> F[Good]
D --> G[Satisfactory]
D --> H[Poor]

Note: Always refer to IS 9197 for accelerator specs and IS 2 for rounding rules. This ensures compliance and accuracy in epoxy flooring design and maintenance.

IS 4631: Key Specifications & Tables for Materials (Epoxy Resin Flooring)

1. Aggregates

• Must conform to IS 9197:1979.
• Ensure proper grading and cleanliness for durability.

2. Accelerators

• Should comply with IS 9197:1979.
• Used to control curing time of epoxy resin.

3. Chemical Resistance of Epoxy Resin Flooring (Clause 11.1)

Note: Refer to full Table 1 in Clause 11.1 for detailed chemical resistance.

4. Material Properties

• Epoxy resins, hardeners, and compositions must meet IS 9197 standards.
• Proper selection ensures durability against chemicals and mechanical wear.

flowchart TD
  A[Materials] --> B[Aggregates (IS 9197)]
  A --> C[Accelerators (IS 9197)]
  A --> D[Epoxy Resin Composition]
  D --> E[Chemical Resistance Table]
  E --> F[Amine Hardeners]
  E --> G[Polyamide Hardeners]

Summary: Use IS 9197-compliant aggregates and accelerators. Refer to Clause 11.1 Table 1 for chemical resistance of epoxy flooring materials to select suitable resin/hardener combinations based on exposure chemicals.

IS 4631: General Requirements for Epoxy Resin Flooring

Key Specifications:

• Aggregates: Must conform to IS 9197-1979 (Clause 3.6).
• Rounding off: Test results should be rounded per IS 2-1960, keeping significant digits same as specified values (Clause None: 0.5).

Chemical Resistance (Clause 11.1, Table 1):

Epoxy flooring mixes show varying resistance to chemicals at 20°C, classified as:

• E: Excellent
• G: Good
• S: Satisfactory
• P: Poor

Notes:

• Select epoxy type based on expected chemical exposure.
• Use aggregates and materials per referenced IS codes for durability.
• Maintain test precision as per IS 2-1960.

flowchart TD
    A[Epoxy Flooring] --> B{Curing Type}
    B --> C[Amine Hardeners]
    B --> D[Polyamide Hardeners]
    C --> E[Chemical Resistance: E, G, S, P]
    D --> F[Chemical Resistance: E, G, S, P]
    E --> G[Select mix per chemical exposure]
    F --> G

This ensures compliance with IS 4631 general requirements and chemical durability.

IS 4631: Types of Epoxy Resin Floor Toppings

Key Points from IS 4631 & IS 9197-1979:

• Epoxy resin floor toppings depend on the composition of resin and hardener (Clause 0.3).
• Properties must conform to IS 9197-1979 (Clause 4.1).
• Two main types of epoxy resin floor toppings (Clause 5.0):

Types of Epoxy Resin Floor Toppings:

1. Self-Leveling Epoxy Floor Toppings

   • Smooth, glossy finish.
   • Used in areas requiring chemical resistance and easy cleaning.
   • Thickness: Typically 1.5 - 3 mm.

2. Epoxy Mortar Floor Toppings

   • Heavily filled with aggregates.
   • High mechanical strength, abrasion resistance.
   • Thickness: Usually 6 - 12 mm.
   • Suitable for heavy traffic and industrial floors.

Additional Notes:

• Special finishes are available for specific requirements.
• Seal coats of unfinished resin recommended when using heavily filled toppings for better bonding.

Typical Composition (Example):

flowchart LR
    A[Epoxy Resin Floor Toppings] --> B[Self-Leveling]
    A --> C[Epoxy Mortar]
    B --> D[Thin, smooth finish]
    C --> E[Thick, aggregate-filled]
    D --> F[Chemical resistance]
    E --> G[High abrasion resistance]

For detailed mix design and mechanical properties, consult IS 9197-1979 and resin supplier data sheets.

IS 4631 - Recommended Thickness of Epoxy Resin Floor Toppings (Clause 6.1 & 6.5)

Key Notes:

• Thickness ensures durability, chemical resistance, and mechanical strength.
• Non-skid floors can be prepared by sprinkling grit on tacky epoxy topping (Clause 5.4).
• Selection depends on traffic, thermal conditions, and chemical exposure.

Chemical Resistance Summary (Clause 11.1 Table 1)

• Epoxy cured with Amine or Polyamide Hardeners show varying resistance.
• Refer to the detailed chemical resistance table for specific substances.
• Ratings: E (Excellent), G (Good), S (Satisfactory), P (Poor).

flowchart TD
    A[Epoxy Resin Floor Toppings] --> B[Trowel Type]
    A --> C[Flow Type]
    A --> D[Terrazzo Floors]

    B --> B1[4 mm - Normal Use]
    B --> B2[6.5 mm - Heavy Traffic / Thermal Shock]

    C --> C1[2 mm - Thin Applications]

    D --> D1[10 mm - Heavy Duty]

    style B1 fill:#a2d5f2,stroke:#000,stroke-width:1px
    style B2 fill:#f9d5e5,stroke:#000,stroke-width:1px
    style C1 fill:#a2f2a2,stroke:#000,stroke-width:1px
    style D1 fill:#f2dba2,stroke:#000,stroke-width:1px

Summary: Use minimum thickness based on traffic and environment: 4-6.5 mm for trowel, 2 mm for flow, and 10 mm for terrazzo floors to ensure performance and durability

IS 4631 Key Points: Mixing and Spreading of Epoxy Resin Flooring

Mixing (Clauses 7.1 & 9.1)

• Constituents: Mix resin, hardener, and aggregate (if any) in specified proportions.
• Order: Resin → Hardener → Aggregate (dry condition).
• Mixing Method:
  • Power mixing with good shearing action preferred.
  • Hand mixing allowed for small jobs.
  • Continuous mixing equipment permitted for flow-type mixes.
• Mixing Duration: Sufficient for thorough blending but within pot-life limits.
• Aggregate Storage: Must be dry to avoid moisture contamination.

Spreading (Clause 7.2)

• Use conventional equipment: trowels, notched spreaders, screed leveling devices.
• Do NOT use water or detergent on tools (epoxy is moisture-sensitive).
• Equipment must be dry before contact with resin.

Special Preparation (Clause 9.2.2)

• For heavily filled trowelling compounds, apply a tack coat of unfilled resin-hardener mix first.
• Allow tack coat to cure to a tacky stage before topping.

Summary Table for Mixing & Spreading

flowchart TD
    A[Start Mixing] --> B[Add Resin]
    B --> C[Add Hardener]
    C --> D{Add Aggregate?}
    D -- Yes --> E[Add Dry Aggregate]
    D -- No --> F[Mix Thoroughly]
    E --> F
    F --> G[Apply Mix within Pot-life]
    G --> H[Spreading with Dry Tools]
    H --> I{Heavy Fill?}
    I -- Yes --> J[Apply Tack Coat & Partial Cure]
    J --> K[Apply Trowelling Compound]
    I -- No

IS 4631 – Preparation of Floor Surface for Epoxy Resin Flooring

Key Specifications & Procedures

• Concrete Surface Preparation (Clause 8.2):

  • Base concrete must be properly cured and dried.
  • Surface must be roughened by:
    • Sand blasting
    • Hacking
  • Remove laitance by washing with dilute hydrochloric acid (10-15%) for ~15 minutes until bubbling stops.
  • Rinse thoroughly with water or dilute ammonia; test pH with litmus paper.
  • Dry surface completely before application.
  • Remove grease/oil with solvents (acetone) or detergents.
  • Repair cracks and broken areas with fresh concrete; cure before topping.
  • Heavy contamination: scarify or wire brush.

• Non-Skid Floors (Clause 5.4):

  • Sprinkle suitable grit on epoxy topping while still tacky.

• Spreading Equipment (Clause 7.2):

  • Use conventional tools: trowels, notched spreaders, screed devices.
  • Do not use water/detergent on tools to wet trowel (epoxy sensitive to moisture).

Summary Table: Surface Preparation Steps

flowchart TD
    A[Existing Concrete Floor] --> B[Check Structural Soundness]
    B --> C{Cracks/Broken Areas?}
    C -- Yes --> D[Repair and Cure Concrete]
    C -- No --> E[Remove Contamination]
    E --> F[Remove Laitance with HCl]
    F --> G[Roughen Surface (Sand Blast/Hack)]
    G --> H[Dry Surface]
    H --> I[Apply Epoxy Resin Topping]

IS 4631: Application of Epoxy Resin Topping – Key Points

1. Material Specifications

• Epoxy resin and hardeners must conform to IS 9197:1979.
• Mix composition critically affects mechanical and chemical properties.
• Consult the resin formulator for precise mix details.

2. Types of Epoxy Resin Toppings

• Various types exist depending on filler content and usage.
• Heavily filled traveling compounds may require a seal coat of unfinished resin.

3. Application Procedure (Clause 9.2)

• Surface preparation: Clean, dry, and free from dust/oil.
• Primer coat: Apply epoxy primer if recommended.
• Mixing: Thoroughly mix resin and hardener as per manufacturer instructions.
• Application: Spread epoxy topping evenly using trowels or rollers.
• Curing: Allow adequate curing time under specified temperature conditions.

4. Typical Properties (from IS 9197)

Summary Diagram of Application Steps:

flowchart TD
    A[Surface Preparation] --> B[Primer Application]
    B --> C[Mixing Resin & Hardener]
    C --> D[Apply Epoxy Topping]
    D --> E[Curing & Finishing]

Note: Always follow manufacturer's guidelines and IS code clauses for detailed instructions.

IS 4631 - Curing of Epoxy Resin Flooring

The code does not explicitly detail curing formulas but provides important specifications and practices for epoxy resin flooring curing:

Key Points on Curing from IS 4631:

• Surface preparation: For heavily filled trowelling compounds, apply a tack coat of unfilled resin-hardener mix by brush and allow it to cure to a tacky stage before topping (Clause 9.2.2).
• Expansion joints: Must align with base concrete joints and be filled with flexible, chemically resistant putty (Clause 9.4).
• Chemical resistance: Proper curing affects chemical resistance; refer to Table 1 (Clause 11.1) for resistance ratings at 20°C.

General Curing Guidelines (Industry Practice):

• Temperature: Maintain ambient temperature between 20°C to 30°C for optimal curing.
• Time: Typical full cure time is 7 days; partial cure (tacky stage) occurs within 4-6 hours.
• Humidity: Keep low humidity to avoid moisture interference.
• Mix ratio: Follow exact resin-to-hardener ratio for chemical reaction.

Typical Curing Reaction:

[ \text{Epoxy Resin} + \text{Hardener} \xrightarrow{\text{time, temperature}} \text{Cross-linked polymer (Cured epoxy)} ]

Summary Table: Chemical Resistance (Excerpt)

flowchart LR
    A[Mix Resin & Hardener] --> B{Apply Tack Coat?}
    B -- Yes --> C[Tack coat cures to tacky stage]
    C --> D[Apply Filled Trowelling Compound]
    B -- No --> D
    D --> E[Allow Full Cure (7 days)]
    E --> F[Achieve Desired Chemical Resistance & Strength]

Note: Always consult

IS 4631: Chemical Resistance of Epoxy Resin Flooring (Clause 10.1 & 11.1)

Key Points:

• Chemical resistance depends on the type of hardener used:
  • Amine or Amine-Adduct Hardeners: Higher chemical resistance.
  • Polyamide Hardeners: Better for impact and temperature fluctuations but slightly less chemical resistant.

Chemical Resistance Ratings (at 20°C):

Notes:

• E = Excellent, G = Good, S = Satisfactory, P = Poor, X = Unsatisfactory
• Performance depends on chemical concentration, combined chemical/mechanical stresses, and temperature variations.
• Polyamide hardeners recommended for floors under impact and temperature fluctuations despite slightly lower chemical resistance.

Summary Diagram:

flowchart LR
    A[Epoxy Resin Flooring] --> B{Hardener Type}
    B --> C[Amine Hardeners]
    B --> D[Polyamide Hardeners]
    C --> E[Higher Chemical Resistance]
    D --> F[Better Impact & Temperature Resistance]
    E --> G[Use where chemical exposure is high]
    F --> H[Use where mechanical stress & temp vary]

For detailed chemical resistance, refer to Table 1 in Clause 11.1 of IS 4631.

IS 4631 - Maintenance of Epoxy Resin Flooring

Key Points on Maintenance (Clause 12.1 & 12.1.4)

• Minimal maintenance required for epoxy resin floor toppings.
• Precaution: Spillages of powerful solvents like acetone and trichloroethylene must be drained immediately to prevent damage.

Chemical Resistance (Clause 11.1 - Table 1 Summary)

• Epoxy systems cured with amine hardeners show higher chemical resistance than polyamide-cured systems.
• Polyamide hardeners are preferred where impact stress and temperature fluctuations occur.
• Chemical resistance varies with:
  • Type of chemical
  • Concentration
  • Simultaneous mechanical stresses
  • Temperature variations

* E = Excellent, G = Good, S = Satisfactory, P = Poor

Maintenance Recommendations:

• Clean spills immediately, especially solvents.
• Use polyamide-cured epoxy for floors exposed to mechanical and thermal stresses.
• Regular inspection to detect chemical or mechanical damage early.

flowchart TD
    A[Spillage of Solvents] --> B{Solvent Type?}
    B -->|Acetone or Trichloroethylene| C[Drain Immediately]
    B -->|Others| D[Clean as per chemical resistance]
    C --> E[Prevent floor damage]
    D --> E

For detailed chemical resistance, refer to Table 1, Clause 11.1 in IS 4631.