About STP ShaliKote T-12 & T-14

STP ShaliKote T-12 and T-14 are cold-applied bituminous emulsions in which selected grades of bitumen are dispersed in water alongside inert and fibrous fillers. When the emulsion breaks and sets, it leaves a jointless black film that is impervious to moisture and carries excellent vapour-barrier properties. Because the binder stays flexible rather than curing brittle, the film accommodates the constant expansion, contraction and vibration that pipework and process vessels see in service, so it does not craze or lift when the substrate moves. The fibrous fillers reinforce the film and give it body, which is why the product can be trowelled to a genuine millimetre-plus thickness in a single pass rather than the paper-thin coat a plain emulsion would leave.

The two grades exist for a reason. T-12 has the softer base and stays more plastic, which suits it to surfaces that flex a great deal or run cooler. T-14 is built on a harder bitumen, so it forms a tougher, more damage-resistant film and holds up better where ambient or service temperatures run high. Both share the same core purpose on Indian sites: keeping thermal insulation dry so it retains its insulating value, acting as a continuous vapour barrier, and defending the steel beneath from under-insulation corrosion. The same films also serve as a sound undercoating below refractory linings, where their moisture resistance and adhesion give the lining a stable, protected base to bond onto.

The technical insight

Under-insulation corrosion is one of the quietest and most expensive failure modes on a plant, because water that soaks into insulation lagging sits invisibly against warm carbon steel and drives corrosion out of sight until a line fails. ShaliKote works by attacking the moisture pathway rather than the steel. The bitumen dispersion coalesces into a continuous, jointless film with a very low water-vapour transmission rate, so it behaves as a vapour barrier that stops humid air and condensate from ever reaching the metal or wetting the insulation. The fibrous fillers do two jobs at once: they build film thickness, delivering a dry film of roughly 525-550 microns, and they knit the film together so it resists cracking when the substrate vibrates or cycles through temperature. Crucially the film stays plastic instead of hardening off completely, which means thermal movement is absorbed by the coating rather than concentrated into cracks. That combination of a thick, reinforced, flexible, low-permeability film is what lets a cold-applied emulsion protect hot lagged systems reliably where a rigid or thin coating would fail.

Where it is used

• Protecting thermal insulation on process pipework and vessels to preserve its insulating efficiency
• Vapour-barrier coating over lagging to keep insulation permanently dry
• Undercoating below refractory linings on furnaces, ducts and equipment
• Defending lagged carbon-steel lines against under-insulation corrosion (UIC)
• Moisture and damp-proofing of insulated tanks and storage vessels
• Flexible protective film on surfaces subject to vibration and thermal cycling
• Base coat beneath decorative or reflective SuperSilverShield finishes
• General bituminous damp-proofing where a solvent-free, cold-applied emulsion is preferred

Key advantages

• Solvent-free and water-based, so it is low-odour, non-toxic and safer to apply in enclosed or occupied areas
• Stays plastic in service and absorbs vibration, thermal movement and accidental shock without cracking
• Excellent vapour-barrier and moisture-resistance for reliable UIC protection
• Cold applied by brush or trowel, needing no heating, torching or hot works on site
• Jointless, seamless film with no laps or seams for water to track through
• Two grades let you match film hardness to service temperature (T-12 cooler and flexible, T-14 warmer and tougher)
• Fibrous fillers build a genuinely thick 525-550 micron dry film in two coats
• Compatible top coat with SuperSilverShield for a reflective, decorative finish

Limitations & considerations

• This is an insulation-protection and vapour-barrier coating, not a structural or pedestrian/vehicular-traffic-grade waterproofing membrane
• Full drying takes about 48 hours and the film hardens progressively over three to seven days, so it needs protection from disturbance during that window
• The mandatory 24-hour gap between coats, plus primer drying, makes it a multi-day operation that must be planned around the schedule
• Being water-based it should not be applied when rain, freezing or heavy condensation is likely before the emulsion has broken and set
• The substrate must be cleaned back to firm, dust-free material and the diluted primer coat must dry to black before top coats go on
• Colour is limited to a brown-to-chocolate emulsion that turns black on setting; where appearance matters a SuperSilverShield or similar finish is needed

Selection & best practice

Specifications

Industry use cases

How we position STP ShaliKote T-12 & T-14

Within STP’s own range, ShaliKote T-12 and T-14 sit among the ShaliKote bituminous emulsions; the wider ShaliKote family (grades such as T-10 and T-32) covers general damp-proofing and waterproofing duties, while a reflective SuperSilverShield finish is the natural top coat where a decorative, heat-reflective surface is wanted over the cured bituminous film. If your requirement is straightforward below-grade or structural bituminous waterproofing rather than insulation protection, a plain ShaliKote emulsion or a polymer-modified membrane is usually the better fit. Space Arc also carries equivalent bituminous emulsions from the Fosroc range for specifiers who require that brand on a project. Talk to our team about the substrate temperature, insulation type and exposure so we can confirm whether T-12 or T-14 is the right grade and whether a top coat is needed.

Related Waterproofing products

View all Waterproofing products →