Sikadur-31 CF Normal
Product Category: Structural Epoxy Adhesive & Repair Mortar
Brand: Sika
Model Code: Sikadur®-31 CF Normal
Description
Sikadur®-31 CF Normal is a 2-component, moisture-tolerant epoxy adhesive and repair mortar, designed for structural bonding, crack repair, and concrete patching. It is thixotropic (non-sag) and suitable for vertical and overhead applications.
Applications
Structural Bonding
Concrete elements
Natural stone
Ceramics and fiber cement
Brick and masonry
Steel, iron, aluminium
Wood
Glass and epoxy surfaces
Repair Applications
Corners and edges repair
Holes and void filling
Vertical and overhead repairs
Joint & Crack Repair
Crack filling
Edge repair (arris repair)
Key Features
High structural strength
Excellent adhesion to most materials
Non-sag (ideal for vertical & overhead)
Moisture tolerant (can apply on damp substrate)
Hardens without shrinkage
No primer required
High mechanical and abrasion resistance
Impermeable to water and liquids
Good chemical resistance
Standards & Certification
EN 1504-4 → Structural bonding (CE marked)
Product Information
Type: 2-component epoxy adhesive
Composition: Epoxy resin + fillers
Packaging
1.2 kg set (A+B)
6 kg set (A+B)
Colour
Part A: White
Part B: Dark grey
Mixed: Concrete grey
Shelf Life
24 months
Storage
+5°C to +30°C
Dry, sealed packaging
Density
~1.90 kg/L (mixed)
Technical Data
Strength Performance (at +23°C)
Compressive Strength:
1 day: ~50 N/mm²
3 days: ~60 N/mm²
7 days: ~65 N/mm²
Tensile Strength:
1 day: ~8 N/mm²
3 days: ~20 N/mm²
7 days: ~21–22 N/mm²
Flexural Strength:
7 days: ~35 N/mm²
Adhesion Strength:
Concrete: >4 N/mm² (concrete failure)
Steel: up to ~15 N/mm²
Mixing Ratio
Component A : B = 2 : 1 (by weight or volume)
Consumption
~1.9 kg/m² per 1 mm thickness
Layer Thickness
Maximum: 30 mm per layer
Vertical application: non-sag up to ~15 mm
Application Conditions
Temperature: +10°C to +30°C
Substrate: dry or damp (no standing water)
≥3°C above dew point
Working Time (Pot Life)
Temperature
Pot Life
+10°C
~145 min
+23°C
~55 min
+30°C
~35 min
Application Method
Mixing
Mix Part A (~30 sec)
Add Part B
Mix for ~3 minutes
Remix in clean container
Application
Apply using:
Spatula
Trowel
Notched trowel
Uses
Thin adhesive → apply directly
Repair mortar → use formwork if needed
Vertical bonding → support elements for ~12 hours
Surface Preparation
Surface must be:
Clean
Sound
Free from oil, grease, dust
Concrete must be ≥28 days old
Steel must be cleaned to Sa 2.5 standard
Important Notes
Do NOT mix large quantities at once (reduce pot life)
Divide mixed material in hot conditions
Avoid air entrapment during mixing
Protect from condensation
Performance Advantages
Structural-grade bonding solution
High strength and durability
Multi-purpose (adhesive + repair)
Suitable for difficult applications
Long-lasting performance
Cleaning
Use Sika® Colma Cleaner
Hardened material → mechanical removal
Safety & Handling
Follow SDS guidelines
Use PPE
Apply by trained professionals
Additional Notes
Lab-tested values
Site conditions may affect results
Structural design must consider creep behavior
Summary
Sikadur®-31 CF Normal is a high-performance structural epoxy adhesive and repair mortar, offering exceptional bonding strength, durability, and versatility, making it ideal for concrete repair, structural bonding, and crack filling applications.