Application guide
Organic Solvent-Resistant Resin for Solvent Storage Linings, Sewage Pipes and Effluent Equipment
FRP linings for organic-solvent storage, sewage pipes and effluent-treatment equipment with the isophthalic anti-corrosive grade SPR 301 OS, and where it fits among the tank-lining resins.
The isophthalic grade the catalogue lists for organic solvents.
Storing organic solvents, carrying sewage and treating effluent all put an FRP laminate in continuous contact with media that attack ordinary resins. Organic Solvent-Resistant Grade Resin (SPR 301 OS) is the Samrat Poly Resins, India isophthalic anti-corrosive grade described as resistant to organic solvents, with good chemical and heat resistance. The SPR 301 OS knowledge hub explains the grade; the existing effluent and process tanks guide covers the general isophthalic tank middle band, while this guide focuses on the solvent, sewage-pipe and effluent-equipment uses the catalogue lists for SPR 301 OS.
What manufacturers build
The catalogue lists three uses: FRP linings for organic-solvent storage, sewage pipes, and effluent-treatment equipment. That covers lining contractors working inside solvent tanks and containment, fabricators of FRP sewage pipes and fittings, and makers of the channels, covers, hoods and vessels used in effluent-treatment plants. The catalogue does not name a pipe-making process for this grade, so the process should be discussed on enquiry.
Why this material suits the work
SPR 301 OS is listed as a clear, light-straw to reddish-amber liquid of 200–400 cPs at 25 °C, gel time 15–35 minutes at 25 °C, specific gravity 1.03–1.15 and 35–50% styrene by weight, supplied non-accelerated and non-thixotropic. The low viscosity wets out reinforcement readily; being non-thixotropic, its behaviour on vertical lining walls should be checked with a trial on your own lay-up. Chemical-resistance wording describes the grade’s intended service, not a compatibility chart: the specific solvent, its concentration and the temperature decide suitability. Decision rule: SPR 301 OS where organic solvents are the medium; SPR 301 OT for oil-storage linings; Vinyl Ester Resin where the chemical service is more aggressive. The tank-lining resin comparison and the OT vs OS vs vinyl ester comparison help settle it.
Required resin characteristics
- An isophthalic anti-corrosive resin described as resistant to organic solvents
- Good chemical and heat resistance, as the catalogue lists
- Low viscosity for thorough wet-out of mat and veil (200–400 cPs listed)
- A working time suited to lining and fabrication (15–35 minutes listed)
- A defined service: the solvent or effluent, its concentration and temperature
Process context
Linings and effluent equipment are commonly built by hand lay-up: the substrate or mould is prepared, catalysed resin is applied with glass mat and a surface veil to form a resin-rich layer facing the medium, and the laminate is rolled free of air and built up to the designed thickness. Pipe fabrication methods vary, and the catalogue does not name one for this grade. The catalogue reference cure for SPR 301 OS is MEKP 1.5% with cobalt octoate 0.4%. The peroxide and the cobalt accelerator are added to the resin separately, one after the other with mixing in between; a concentrated peroxide is never mixed directly with cobalt. Because the grade is non-thixotropic, work vertical faces in thinner passes and check for drainage before gel. The figures are typical catalogue values that describe the grade, not batch guarantees, and dosage for your workshop temperature is settled by trial.
Advantages
- Catalogue-listed for organic-solvent storage linings, sewage pipes and effluent-treatment equipment
- Isophthalic anti-corrosive chemistry with organic-solvent resistance described
- Low listed viscosity of 200–400 cPs for wet-out
- Supplied non-accelerated, with a reference cure of MEKP 1.5% and cobalt octoate 0.4%
Common products
- FRP linings for organic-solvent storage tanks
- FRP sewage pipes and fittings
- Effluent-treatment channels, covers and hoods
- FRP vessels for effluent-treatment plants
Common questions
The catalogue describes resistance to organic solvents in general but publishes no list. Name the solvent, its concentration and temperature on enquiry so suitability can be discussed.
That guide covers the general isophthalic route for effluent and process tanks. This one covers SPR 301 OS specifically, for the solvent-storage, sewage-pipe and effluent-equipment uses its catalogue entry lists.
No. The catalogue lists it as non-accelerated and non-thixotropic. On vertical faces, work in thinner passes and confirm sag behaviour with a trial.
Choose SPR 301 OT for oil-storage linings, and Vinyl Ester Resin where the chemical service is more aggressive than an isophthalic lining is intended for. The medium, concentration and temperature decide.
Lining for solvents or effluent?
Send the medium, its concentration and temperature, and the tank, pipe or equipment you are building. Samrat Poly Resins, India manufactures the grade and issues its technical information. Samrat FRP Traders is the Nepal supplier and importer and handles enquiries; price, packaging, lead time and stock in Nepal are confirmed on enquiry.
Contact Samrat FRP Traders