STP ShaliUrethane PC 1000
A spray-applied, solvent-free aromatic polyurethane that builds a thousand-micron protective barrier in a single pass for pipelines, tanks and marine steel.
What is it?
A two-component, 100% solids aromatic polyurethane protective coating, applied by plural-component airless spray for external and internal protection of concrete and steel pipes, tanks and structures.
Where is it used?
Onshore and offshore pipelines, water and wastewater lines, STP tanks, storage tanks, reservoirs, marine piles, penstocks and dam gates.
Why use it?
It lays down 1000-1100 microns of tough, chemical- and abrasion-resistant film per coat with zero VOC, cutting the number of passes and giving fast return to service.
How is it applied?
Grit-blasted or primed steel/concrete is coated with ShaliPrime 2PU or 2E LC, then PC 1000 (Part A:B = 3:1) is sprayed hot at 3500-5000 psi through a 32-39 thou tip.
About STP ShaliUrethane PC 1000
ShaliUrethane PC 1000 is STP Limited’s heavy-duty answer to the problem of protecting pipe and tank steelwork that has to survive years of immersion, effluent and weather. It is a two-part aromatic polyurethane supplied at a 3:1 volume ratio and sprayed through plural-component airless equipment, where the two streams meet and react at the gun. Because it carries no solvent and cures at 100% volume solids, everything that goes on the substrate stays there as film – there is no shrinkage or flash-off, and a single wet-on-wet pass can reach 1000 to 1100 microns of dry thickness. That film-build capability is the whole point of the product: it replaces the multi-coat build-ups that conventional protective paints need, so a large surface can be turned around in far fewer passes.
For Indian contractors this makes PC 1000 a natural fit on jobs where downtime and coating labour cost real money – water and wastewater mains, sewage treatment tanks, storage reservoirs, mounded bullets, marine and offshore steelwork and rehabilitated pipelines. It is certified-suitable for potable and waste water contact, resists seawater and most acids, and shrugs off microbiologically induced corrosion in sewer environments. Space Arc Engineering supplies and applies it as an authorised STP channel across Delhi NCR and pan-India, pairing the material with the correct ShaliPrime primer and the spray plant it actually needs.
The technical insight
The performance comes from the aromatic polyurethane backbone reacting at 100% solids. With no diluent to evaporate, the isocyanate and polyol components crosslink into a dense, high-molecular-weight network the instant they are atomised together, which is why the film can hang thick on vertical steel without slumping and be touch-dry in one to two hours. That tight network is what delivers the numbers on the data sheet – 10-12 MPa tensile strength, Shore D 50-60 hardness, 6-8 MPa pull-off adhesion on steel and a water-vapour transmission below 0.27 g/m2/24hr, so water simply cannot track through to the metal. The trade-off is deliberate: aromatic chemistry is chosen here for toughness and cost on buried, immersed or over-coated surfaces, and it will chalk and shift colour under prolonged sunlight – a cosmetic effect only, and the reason an aliphatic PU topcoat is specified whenever the surface stays UV-exposed.
Where it is used
- External and internal coating of onshore and offshore pipelines carrying water and waste water
- Lining of sewage treatment plant (STP) tanks, sewer lines and effluent channels
- Protection of steel and concrete storage tanks, mounded bullets, reservoirs and overhead tanks
- Coating of marine and offshore structures, marine piles, ship decks and ship hulls
- Internal protection of concrete tunnels and hydro-electric penstocks and dam gates
- Lining of pipes used for bore and horizontal directional-drill installation
- Recoating, repair and rehabilitation of ageing pipelines and damaged coatings
- Anti-corrosion barrier for thermal power cooling plants and cooling-water basins
Key advantages
- Builds 1000-1100 microns of dry film per coat, so most jobs need far fewer passes
- 100% volume solids and completely VOC-free, safe for confined tanks and potable-water lines
- Fast curing – touch dry in 1-2 hours – allowing rapid recoat and return to service
- Excellent adhesion to both steel (6-8 MPa) and concrete, with concrete-failure pull-off
- Tough and abrasion-resistant, with high tensile strength and Shore D 50-60 hardness
- Excellent resistance to seawater and to most acids and chemicals
- Protects against microbiologically induced corrosion in sewer and effluent service
- Passes 5000-hour salt spray and 2000-hour accelerated weathering without blistering
Limitations & considerations
- Aromatic chemistry chalks and changes colour under prolonged UV; an aliphatic PU topcoat is needed on sun-exposed surfaces
- Requires plural-component airless spray plant and a trained applicator – not a brush or roller product
- Substrate must be blast-cleaned/prepared and primed with ShaliPrime 2PU or 2E LC first; concrete needs to be at least 28 days old and below 5% moisture
- Low temperature, rain or water ponding during and after application can cause incomplete cure and blistering
- Contains isocyanate and is flammable, demanding full PPE, ventilation and control of ignition sources
- Once Component B is opened it must be used the same day, and tools must be cleaned immediately with STP Thinner before the film hardens
Selection & best practice
Success with PC 1000 is decided before the gun is switched on. Blast-clean steel to a bright profile and confirm concrete is at least 28 days old with moisture below 5%, then prime with ShaliPrime 2PU or 2E LC and coat only once the primer is surface-dry. Keep substrate and ambient temperature between 10 and 50 degrees C and never spray onto damp or ponded surfaces or when rain is likely – moisture at this stage is the commonest cause of blistering and soft film. Stir Component A thoroughly with a slow spiral mixer (100-200 rpm) for uniformity, hold the 3:1 ratio at the plural-component pump, and set tip pressure at 3500-5000 psi through a 32-39 thou tip to atomise properly. Where higher build is wanted apply a second coat once the first is surface-dry, and remember to always correlate consumption against surface profile and wastage – a rough or field surface will draw more material than the 1.0-1.1 m2/L lab figure suggests.
Specifications
| Chemistry / Type | 2K aromatic polyurethane, solvent-free |
| Colour & Mixing Ratio | Grey; Component A:B = 3:1 by volume |
| Volume Solids | 100% (ASTM D 2697) |
| Recommended DFT per coat | 1000-1100 microns (ASTM D 4414) |
| Theoretical consumption | 1.0-1.1 m2/L (IS 101) |
| Pot life (100 g sample) | 30-40 minutes at 30 C (ASTM D 2471) |
| Touch / surface dry | 1-2 hrs touch, 5-8 hrs surface (IS 101) |
| Tensile strength / Hardness (7 days) | 10-12 MPa; Shore D 50-60 |
| Adhesion pull-off (7 days) | 6-8 MPa on steel; >=2 MPa (concrete failure) |
| Packaging & Shelf life | 20L drum (15L A + 5L B) or 200L barrels; 12 months |
Industry use cases
Water & Wastewater
Internal and external lining of potable and waste water mains, sewer lines and STP tanks, where the VOC-free 100% solids film gives a safe, seamless barrier certified for water contact.
Oil, Gas & Pipelines
External anti-corrosion coating of onshore/offshore pipelines and lining of bore and directional-drill pipes, plus recoat and rehabilitation of ageing lines with high single-coat build.
Marine & Offshore
Protection of marine piles, offshore steelwork, ship decks and hulls against seawater immersion, abrasion and microbiologically induced corrosion.
Power & Hydro
Lining of hydro-electric penstocks, dam gates and thermal-power cooling basins, using the coating’s abrasion and chemical resistance under continuous water flow.
Storage & Containment
Tough immersion-grade lining for storage tanks, reservoirs, overhead tanks and mounded bullets that need a durable, chemically resistant barrier.
Frequently asked questions
Can ShaliUrethane PC 1000 be brush or roller applied?
How much thickness can I get in one coat?
Is it safe for potable water and sewage tanks?
Does it need a primer, and which one?
Will it yellow or fade outdoors?
What is the pack size and shelf life?
How we position STP ShaliUrethane PC 1000
ShaliUrethane PC 1000 is the aromatic, high-build workhorse of STP’s protective-coating range; where a UV-exposed finish is needed, over-coat it with an aliphatic ShaliUrethane topcoat, and prime beneath it with ShaliPrime 2PU or ShaliPrime 2E LC. For an epoxy-based alternative on aggressive chemical immersion, STP’s ShaliUrethane and epoxy novolac systems apply – and across our other brands the closest counterparts are the epoxy tank-lining and PU protective coatings from Fosroc and Sika. Space Arc supplies and applies the full primer-plus-coating system, so specifiers can match the right chemistry to the exposure rather than buying the material alone.
Fosroc Nitocote EN901 — A specifier facing very aggressive chemical immersion (pH 1-14 acids, alkalis and solvents) may prefer Fosroc’s 100% solids epoxy novolac lining over the aromatic PU, trading PU flexibility for broader chemical resistance.
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Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.