Sikadur®-31 IN
Two-Component Thixotropic Structural Epoxy Adhesive
Product Description
Sikadur®-31 IN is a high-performance, solvent-free, moisture-tolerant, two-part epoxy adhesive and repair mortar. Formulated with epoxy resins and special fillers, it serves as a versatile structural bonding agent and repair compound.
Its thixotropic nature allows for non-sag application on vertical and overhead surfaces. Sikadur®-31 IN is designed for use at temperatures between +10°C and +40°C and bonds efficiently to both dry and damp substrates without the need for a primer. It hardens without shrinkage, forming a liquid-impermeable seal that ensures long-term structural integrity and protection against environmental factors.
Key Advantages
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Versatile Application: Suitable for dry and damp concrete surfaces; non-sag on vertical and overhead areas.
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High Performance: High initial and ultimate mechanical strengths; excellent abrasion and chemical resistance.
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User-Friendly: Easy to mix and apply; components are colored differently to ensure visual control of mixing.
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Durability: Hardens without shrinkage; impervious to liquids and water vapor.
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Convenience: No primer required.
Applications
Sikadur®-31 IN is an “adhesive and filler in one,” suitable for the following applications:
1. Structural Bonding
Excellent adhesion to a wide range of construction materials, including:
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Concrete elements
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Hard natural stone
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Ceramics and fiber cement
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Mortar, bricks, masonry, and blocks
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Steel, iron, and aluminum
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Wood
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Polyester and epoxy
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Glass
2. Concrete Repair
Fast-setting repair mortar for:
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Corners, edges, and joint arrises
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Filling holes and voids
3. Joint & Crack Sealing
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Rigid joint filling
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Sealing and filling of non-moving cracks
Technical Data
| Property | Value |
| Mixing Ratio | Part A : Part B = 2 : 1 (by weight) |
| Density (Mixed) | 1.80 ± 0.1 kg/L (at +30°C) |
| Pot Life | ≥ 40 minutes (100g mass at +30°C) |
| Layer Thickness | Max 30 mm per layer. (Apply in successive layers for >30 mm) |
| Sag Flow | Non-sag up to 10 mm thickness on vertical surfaces (ASTM D 2730) |
| Consumption | ~2.0 kg/m ² per mm of thickness (Dependent on substrate roughness) |
Mechanical Properties (at +30°C)
| Duration | Compressive Strength | Flexural Strength | Tensile Strength |
| 1 Day | ≥ 45 N/mm² | ≥ 10 N/mm² | — |
| 3 Days | ≥ 50 N/mm² | ≥ 15 N/mm² | ≥ 5 N/mm² |
| 7 Days | ≥ 55 N/mm² | ≥ 20 N/mm² | ≥ 8 N/mm² |
| 14 Days | ≥ 60 N/mm² | ≥ 25 N/mm² | — |
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Tensile Adhesion Strength: ≥ 10 N/mm² (Concrete failure) (ASTM C 882)
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Shrinkage: Hardens without shrinkage.
Application Conditions
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Temperature Range: +10°C min. / +40°C max. (Applies to Product, Ambient Air, and Substrate).
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Dew Point: Substrate temperature must be at least 3°C above the dew point to avoid condensation.
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Substrate Moisture: Cementitious substrates must be dry or matt damp (no standing water).
Storage and Packaging
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Packaging:
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Small Set (3 kg): Part A (2 kg) + Part B (1 kg)
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Medium Set (6 kg): Part A (4 kg) + Part B (2 kg)
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Large Set (30 kg): Part A (20 kg) + Part B (10 kg)
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Shelf Life: 12 months from the date of production.
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Storage Conditions: Store in original, unopened, sealed, and undamaged packaging in dry conditions between +5°C and +40°C. Protect from direct sunlight.
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