Coljoint N2
Coljoint N2 is a polymer modified, bituminous, hot applied joint sealant compound.
It is designed to be tough, flexible and have good extension properties over a wide range of ambient temperatures. Coljoint N2 is suitable for joints between concrete and bituminous surfacing preventing entry of water and other materials. It has excellent recovery properties and low temperature flexibility. Coljoint N2 is not recommended for overbanding due to its lack of skid resistance. Jointgrip OB is recommended for overbanding due to its superior skid resistance properties.
- Carriageways
- Runways
- Motorways
- Footways
Damaged joints must be repaired using an epoxy mortar approved by Colas. If necessary joints should also be treated by grit blasting. Joints and cracks should always be thoroughly cleaned and dried with a hot compressed air lance in order to remove all moisture and dirt. This process should be carried out immediately prior to the application of Coljoint N2.
Concrete joints should be primed with CP Primer before applying Coljoint N2.
Coljoint N2 should be heated indirectly and agitated in a purpose-built sealant preheater unit with thermostatic control. Ensuring that the temperature does not exceed 190°C. The heater unit should be oil-jacketed. The materials Should then be pumped into the joint, or poured at temperatures between 170°C – 180°C using a melter pourer or bucket and ‘V’ mould, with the minimum loss of temperature. Joints should be sealed to a level of at least 3mm below the surface.
Application Properties
| Pouring temperature | 175ºC/185ºC |
| Safe Heating Temperature | 185ºC for 6 hours maximum. 190ºC maximum temperature. |
Weight of Coljoint N2 sealant to fill 100m joint (kg)
| Depth of Joint (mm) | Width of Joint (mm) | |||||
| 15 | 20 | 25 | 30 | 35 | 40 | |
| 20 | 30 | 40 | 50 | 61 | 71 | 81 |
| 25 | - | - | 63 | 76 | 89 | 102 |
| 30 | - | - | - | - | 122 | 122 |
| 35 | - | - | - | - | 142 | 142 |
| 40 | - | - | - | - | - | 162 |
Coljoint N2 is available in plastic lined paper sacks holding 15kg (nominal). Remove the paper and load into heating equipment.
Keep in dry store under cover.
Manufacture/QC Testing Coljoint N2 is manufactured on a purpose-built plant to an ISO 9001 quality system which covers all Colas manufactured products. Under this system all batches undergo rigorous QC testing before being released for use. Coljoint N2 complies with the specification given in BS EN 14188:1-2004: Joint Fillers and Sealants – Specifications for Hot Applied Sealants for a Type N2 Sealant.
| Test Name | Method | Specification |
| Softening Point (°C) (Ring and Ball) | BS EN 1427 | ≥85 |
| Cone Penetration (dmm) (25°C, 150g, 5s) | BS EN 13880-2 | 40 to 100 |
| Resilience (25°C, 75g ball, 5s) (%) | BS EN 13880-3 | ≤60 |
| Flow Resistance (mm) (60°C, 5h, 75%) | BS EN 13880-5 | ≤3 |
| Extension Test: 3 cycles of extension to 75% at a rate of 6mm/hr at -20°C | BS EN 13880-10 | Pass 3 cycles |
| Density | BS EN 13880-1 | Typically 1.015 g/cm3 at 25OC |
SAFETY HANDLING PRECAUTIONS (when hot)
- Wear suitable protective clothing (heat resistant gauntlet glove, overalls, protective footwear, face visor).
- DO NOT allow water to contact hot material.
- DO NOT exceed maximum safe heating temperature.
If molten material contacts skin:
- DO NOT attempt to remove
- Immerse affected area in cold running water for at least 10
Seek medical advice without delay. This product is hazardous for transportation when carried at temperatures above 100°C.
For full safety information, please request the Coljoint N2 Safety Data Sheet 06 using the contact information below.
