What is it?
H4 is a hot poured joint sealant designed for the treatment of reinstatements and asphalt overlays.
Where to use?
- Transverse or longitudinal vertical joints
- Patch repairs
- Trench reinstatements
- Drain or manhole frames
- Kerb channels
Preparation
Ensure that the joints to be sealed are clean and free from dust, fuel and oil spillage. The face of the joints should be dry with a surface temperature ideally of at least 10°C. Do not apply to icy surfaces or in rain.
N.B: If joint has to be treated in damp conditions, use Colas RS Bitukold - a pourable, cold applied edge sealant.
Application
H4 must be heated before use. For best results, use a heating kettle with an indirect heating system such as hot oil. Ensure that H4 doesn't exceed 180°C and that the oil does not exceed 240°C. When hot, pour either from a watering can or direct from the melting kettle via a pressure fed heated hose with a special nozzle. The 25kg tin pails are not suitable for placing on or over direct heat (i.e. gas or wood fire).
For a 40mm vertical joint face and a 2mm coated thickness of H4: 0.08kg of H4 seals approximately one linear metre of joint or a 25kg pack seals approximately 300 linear metres of joint.
Storage
Keep free from frost and extremes of heat. Do not stack. Do not store in direct sunlight.
Standards
H4 is a 40/60 penetration bitumen that complies with BS 594987 clause 6.8 Joints, vertical face coating. H4 is suitable for jointing as required in Clause 903 of the Specification for Highway Works.
