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


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.


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.


Keep free from frost and extremes of heat. Do not stack. Do not store in direct sunlight.


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.


H4 is supplied in 12.5kg and 25kg siliconised, easy strip cartons, and in 25kg tin pails with handles. Being leak proof, these pails are particularly convenient for use during hot weather.


For full safety information, please refer to the H4 Safety Data Sheet on page 81-84 at the back of this guide.

Safe Handling Precautions (When Hot)

  • Wear suitable protective clothing (heat resistant gauntlet gloves, overalls, protective footwear, face visor)
  • DO NOT allow water to contact hot material
  • DO NOT exceed maximum safe heating temperature
  • Tins/pails must not be placed over direct heat
  • If molten material contacts skin:
    • DO NOT attempt to remove
    • Immerse affected area in cold running water
    • Seek medical advice without delay


This product is hazardousfor transportation when carried at temperatures above 100°C.