STP ShaliJet Sealing Compound
Hot-poured, fuel- and heat-resistant coal tar joint sealant to IS 1834 Grade B, built for runways, filling-station bays and heavy-duty pavement joints.
What is it?
A hot-applied, coal tar based thermoplastic joint sealing compound to IS 1834 Grade B that melts for pouring and sets to a tough plasto-elastic mass on cooling.
Where is it used?
Runway and taxiway joints, road and bridge deck joints, and construction joints in filling stations, garages, warehouse floors and secondary containment where fuel or kerosene spillage is expected.
Why use it?
It stays flexible through cyclic temperature movement yet resists jet-exhaust heat, fuel spillage and root growth, so joints stay sealed where standard bitumen sealants would soften or degrade.
How is it applied?
Prime the joint with ShaliPrime SSC, melt the drum to 180-210 C with slow stirring, then pour at 175-180 C from one side of the clean, dry joint.
About STP ShaliJet Sealing Compound
STP ShaliJet Sealing Compound is a hot-applied joint sealant from the coal tar family, supplied as a solid black mass that is melted on site and poured into the joint. Once it cools it firms up into a plasto-elastic body that holds its shape under load but still stretches as the slabs on either side expand and contract with the seasons. It is manufactured to IS 1834 Grade B, the Indian Standard grade reserved for the more demanding, fuel-exposed service conditions rather than ordinary concrete work.
What sets ShaliJet apart from a general-purpose bitumen sealant is where it is meant to go. Grade B is the airfield and fuelling-area grade, so the compound is formulated to shrug off aviation fuel and kerosene, to hold up against the heat blast of jet exhaust, and to stay put in hot Indian summers instead of bleeding out of the joint. For a runway apron, a petrol pump forecourt or a warehouse floor that sees oil and spillage, that resistance profile is the whole point of specifying it over a cheaper Grade A material.
The technical insight
The performance comes from the thermoplastic coal tar binder. Heated to its pour range the compound flows freely and wets the joint faces, then on cooling it stiffens back into a plasto-elastic solid, one that behaves partly like a plastic and partly like an elastic. That balance is what lets a poured joint accommodate slab movement without either cracking (too rigid) or slumping out in the heat (too soft). The coal tar chemistry is also what delivers the fuel and kerosene resistance that ordinary bitumen lacks; IS 1834 Grade B verifies this with an aviation-fuel immersion test, capping the change in penetration after seven days at 25 C. A controlled penetration window of 15-50 dmm keeps the set compound firm enough to resist indentation yet soft enough to move, while a minimum 6 mm extensibility confirms it can stretch across a working joint. The primer step matters just as much as the pour: ShaliPrime SSC seals the porous concrete and gives the molten compound a surface it can genuinely bond to rather than sit on.
Where it is used
- Expansion and contraction joints in airport runways, taxiways and aprons
- Longitudinal and transverse joints in concrete road pavements
- Bridge deck and approach-slab joints exposed to traffic and weather
- Construction joints in petrol filling stations and vehicle service bays
- Floor and containment joints in warehouses and industrial hardstandings
- Joints in secondary containment bunds and walls of artificial water ponds
- Any concrete joint where fuel, oil or kerosene spillage rules out standard bitumen
Key advantages
- Resists jet-exhaust heat, so it holds up on runway and apron joints
- Resists aviation fuel and kerosene spillage without softening or dissolving
- Low tendency to flow or bleed in hot weather once cooled and set
- Plasto-elastic body accommodates cyclic thermal movement without cracking
- Good adhesion to concrete and other joint faces when correctly primed
- Anti-corrosive and prevents root growth into the sealed joint
- Keeps out water, grit and foreign matter that would spall the joint arris
- Manufactured to IS 1834 Grade B, the recognised airfield/fuel-area grade
Limitations & considerations
- Hot-applied only: needs a melting pot and controlled heating to 180-210 C, so it is not a gun-grade or cold-pour convenience product
- Contains coal tar, which demands ventilation, protective clothing and careful handling on site
- Overheating causes frothing; if bubbles form the temperature must be held near 180 C with slow stirring until they clear
- Black only, with no colour options and a tar odour, so it is unsuited to decorative or interior-facing joints
- Requires a ShaliPrime SSC primer coat and a full 24-hour dry before pouring, adding a day to the sequence
- Where a cold-applied, low-odour or chemically inert sealant is mandated, a polysulfide or MS-polymer sealant is the better route
Selection & best practice
Start with a genuinely clean, dry joint: remove loose gravel, dirt, oil and grease with a jet of dry air and grind the faces smooth. Prime with ShaliPrime SSC at about 0.30 litre per square metre and let it dry a full 24 hours before pouring. Cut open the 26 kg drum and heat to 180-210 C while stirring slowly for uniformity, a drum takes roughly 2-3 hours at 190-200 C on a hand stirrer, and never overheat, since that causes frothing. Pour the molten compound from one side of the joint and let it travel along the gap, keeping the material at 175-180 C during application. Place wooden boards along both edges and use a spouted container to avoid spillage onto the pavement surface.
Specifications
| Product type | Hot-applied coal tar thermoplastic joint sealing compound |
| Standard | IS 1834 Grade B |
| Colour | Black |
| Density | 1.4 +/- 0.05 gm/cc |
| Penetration (25 C, 0.1 mm, 5 sec) | 15-50 |
| Extensibility | 6 mm minimum |
| Pour point (maximum) | 180 C |
| Flow test at 45 C | 5% maximum |
| Application / melting temperature | 180-210 C (pour at 175-180 C) |
| Coverage formula | 704 / (W x D) = running metre per kg (W, D in mm); allow 5-20% wastage |
| Packaging | 26 kg drum |
| Shelf life | 12 months in original sealed drum at 5-38 C |
Industry use cases
Airports & Aviation
Sealing runway, taxiway and apron joints that must survive jet-exhaust heat and aviation fuel spillage, exactly the IS 1834 Grade B duty.
Roads & Highways
Filling transverse and longitudinal joints in concrete pavements and bridge decks for PWD and NHAI works exposed to traffic and weather cycles.
Fuel & Automotive
Construction joints in petrol filling stations and service-bay floors where kerosene and oil spillage would attack ordinary bitumen sealants.
Industrial & Warehousing
Floor and hardstanding joints in warehouses and industrial yards subject to oil, spillage and heavy wheel loads.
Water Retaining & Containment
Joints in secondary containment bunds and the walls and floors of artificial water ponds where root growth and water ingress must be shut out.
Frequently asked questions
Is ShaliJet coal tar based or bitumen based?
What is the difference between IS 1834 Grade A and Grade B?
At what temperature do I heat and pour ShaliJet?
How much material do I need per joint?
Do I need a primer before pouring?
What pack size and shelf life does it come in?
How we position STP ShaliJet Sealing Compound
Within the STP coal tar and sealant family, ShaliJet is the IS 1834 Grade B choice for fuel-exposed and airfield joints. Where the joint is general concrete work with no petroleum spillage, STP ShaliTex Sealing Compound (bitumen based, IS 1834 Grade A) is the correct and more economical alternative. Every ShaliJet pour should be paired with its system primer, ShaliPrime SSC, which is the bonding coat the manufacturer specifies. For projects that call for a cold-applied, low-odour or gun-grade movement-joint sealant instead of a hot-poured tar, Space Arc can supply Fosroc polysulfide and MS-polymer sealants from our wider range. As authorised distributor and applicator across Delhi NCR and Pan-India, we help engineers and consultants match the right grade, primer and application method to the joint at hand.
Fosroc Thioflex 600 — Choose Thioflex 600 when the specification calls for a cold-applied, two-part polysulfide movement-joint sealant rather than a hot-poured coal tar compound, for example on occupied or interior structures where heating equipment and tar odour are impractical.
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