Isophthalic Cooling Tower Grade Resin
SPR 301 CTThixotropic isophthalic gradeSPR 301 · Isophthalic Polyester Resins
Thixotropic isophthalic grade with heat, chemical and corrosion resistance and high strength.
Review the official product data sheet for specifications and application information.
Price
Price on Request
Industrial resin pricing varies based on:
- Order Quantity
- Resin Grade
- Current Raw Material Rates
Product details
| Catalogue Code | SPR 301 CT |
|---|---|
| Resin Chemistry | Isophthalic unsaturated polyester |
| Supply Condition | Non-accelerated · thixotropic |
| Reference Cure System | MEKP 1.5% + Cobalt Octoate 0.4% — added separately during use |
Typical specification
| Appearance | Cloudy to amber liquid |
|---|---|
| Viscosity, 60 rpm | 400–650 cPs |
| Viscosity, 6–12 rpm | 1,500–2,000 cPs |
| Thixotropic Index | 2.0–3.5 |
| Gel Time | 15–35 minutes at 25 °C |
| Specific Gravity | 1.10–1.15 |
| Styrene Content | 37–45% by weight |
Typical values from the Samrat Poly Resins product catalogue, 2026 edition. They are not guaranteed specifications or finished-component properties; confirm the current values for your order and trial the grade on your own process.
SPR 301 CT is the thixotropic isophthalic grade of the SPR 301 family, described in the catalogue as having heat, chemical and corrosion resistance and high strength, and listed for cooling-tower and wind-energy composite components. It is supplied non-accelerated and thixotropic, with MEKP and cobalt octoate added separately during use.
The orthophthalic thixotropic alternative is SPR 201 CTG. The catalogue's selection guide lists both for cooling-tower and wind-energy components, with SPR 301 CT as the isophthalic route.
Key features
- Thixotropic isophthalic grade (SPR 301 CT)
- Heat, chemical and corrosion resistance and high strength, per the catalogue
- Typical thixotropic index 2.0–3.5; gel time 15–35 minutes at 25 °C
- Supplied non-accelerated and thixotropic
Applications
- Cooling-tower composite components
- Wind-energy composite components
Product role
Cooling-tower parts see hot, wet, chemically treated circulating water as well as large vertical lay-up. SPR 301 CT combines the sag resistance of a thixotropic grade with the isophthalic chemistry the catalogue specifies for heat, chemical and corrosion resistance.
The two viscosity readings — 400–650 cPs at 60 rpm and 1,500–2,000 cPs at 6–12 rpm — describe the thixotropy: thin under shear during wet-out, thicker at rest on a vertical face. Confirm sag and wet-out on the actual mould and laminate thickness.
Supply and cure
- Supply condition
- Non-accelerated · thixotropic
- Reference cure system
- MEKP 1.5% + Cobalt Octoate 0.4% — added separately during use
Processes and where this grade fits
SPR 301 CT is a thixotropic isophthalic grade: sag-resistant on large vertical moulds, and isophthalic for parts that see hot, treated water.
| Process or use | Role of this grade | What to confirm |
|---|---|---|
| Hand lay-up of cooling-tower casings, fan stacks, basins and panels | Listed role | The circulating-water temperature and treatment chemicals, plus sag on the real mould |
| Wind-energy composite components | Listed role | The specific component and any turbine-maker requirement |
| Spray-up on vertical moulds | Process to confirm | Atomisation and sag at the thixotropic viscosity, on your equipment |
| Cooling-tower parts without hot or chemical service | Consider SPR 201 CTG | The orthophthalic, thixotropic cooling-tower grade |
| Aggressive chemical service | Consider vinyl ester | SPR 501 VE, Vinyl Ester Resin |
Process-selection considerations
- Use the two viscosity readings: 400–650 cPs at 60 rpm and 1,500–2,000 cPs at 6–12 rpm, with a thixotropic index of 2.0–3.5. The resin thins as it is worked and thickens at rest.
- Describe the water: temperature, treatment chemicals and whether the part is immersed, splashed or only exposed to humidity.
- The typical gel time of 15–35 minutes at 25 °C is longer than the orthophthalic CTG’s, which suits large panels but should be planned into stage timing.
- Confirm sag and wet-out on the actual mould and laminate thickness.
- Reference cure: MEKP 1.5% with cobalt octoate 0.4%, added separately.
Limitations and trial requirements
- No maximum water temperature, chemical-resistance chart or cured mechanical data are published for SPR 301 CT.
- Isophthalic chemistry is chosen for heat, chemical and corrosion resistance relative to orthophthalic grades; that is positioning, not a guarantee for a specific water treatment.
- Wind-turbine blades are not a listed application; blade structures follow the turbine maker’s qualified system.
- Trial the grade on the real part, mould and shop conditions before production. The catalogue values are typical liquid-resin properties, not guaranteed limits or finished-part performance.
Before you select this grade
- The values on this page are typical. Final selection should be confirmed against your own process, a trial result and the current technical documentation for the grade.
- The Technical Data Sheet linked on this page carries these same typical values. No Safety Data Sheet is published on this site for this grade; request current safety information before use.
- Never mix a concentrated peroxide initiator directly with a cobalt accelerator. Add each to the resin separately, according to the confirmed process.
- Store resin, initiators and accelerators separately, in original sealed containers, cool, shaded and away from heat and ignition sources. Use suitable personal protective equipment and adequate ventilation.
