Forpol-Nafta — polyurethane mastic for external insulation of underground gas pipelines
Spray-applied polyurea-urethane coating with 100 % solids for pipes and fittings of underground gas pipelines, service life at least 30 years.

A high-build primer-enamel with high solids: the volume fraction of non-volatile matter is 86±2 %, so the working film is built up in a single pass. Interkron is designed for categories Im1–Im4 per GOST 34667.2 (ISO 12944), that is, immersion in water and soil, and is used on hydraulic structures, industrial structures and equipment in contact with water, chemical reagent solutions, mineral fertilisers and petroleum products. The material combines the functions of primer and finish, is approved by TsNIIS and is tinted to the RAL catalogue.
| Manufacturer | Kronos SPb — AO “KRONOS SPb”, Saint Petersburg |
|---|---|
| Type | primer-enamels |
| Use | steel structures, concrete, equipment, chemical plants |
| Base | Two-component high-solids epoxy (base + hardener) |
| Colour | to the RAL catalogue |
| Application method | brush, roller (thinning 0–10 %); air spray (2–4 bar, nozzle 1.2–2.2, thinning 10–20 %); airless spray (at least 200 bar, nozzle 0.015–0.025″, no thinning) |
| Application temperature | from +5 to +35 °C (down to −10 °C by agreement with the manufacturer); relative humidity max. 85 %; surface at least 3 °C above the dew point; keep the components for 24 h at a temperature not below +15 °C |
| Drying | to degree 3 — 4 h at 20 °C; pot life 90 min at 20 °C |
| Key properties | Corrosivity categories for immersion in water and soil: Im1–Im4 per GOST 34667.2 (ISO 12944), Non-volatile matter by weight: more than 89 %, Volume solids: 86±2 %, Density: 1.50–1.55 g/cm³, Heat resistance: from −60 °C to +60 °C, Surface preparation: Sa 2.5 |
| Compatible materials | primer and finish coat at the same time |
| Shelf life | 12 months from the date of manufacture; storage from −40 to +40 °C |
| Standards | TU 20.30.12-219-20504464-2019; GOST 34667.2 (ISO 12944) |
Data from the manufacturer’s technical data sheet. The coating system, number of coats and quantity are selected for your project on request.
Spray-applied polyurea-urethane coating with 100 % solids for pipes and fittings of underground gas pipelines, service life at least 30 years.
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