ISO Resins
Isophthalic Cooling Tower Grade Resin
A Samrat Poly Resins, India grade, SPR 301 CT. Enquire with Samrat FRP Traders for supply, pricing and packaging in Nepal.
Price
PRICE ON REQUEST
Isophthalic Cooling Tower Grade Resin pricing varies based on:
- Order Quantity
- Product / Resin Grade
- Current Raw Material Rates
Technical documents
Download Technical Data SheetPDFFull product rangeProduct catalogue · PDF, 16 pagesBrowse the document libraryDocuments issued by: Samrat Poly Resins, India
Thixotropic isophthalic grade with heat, chemical and corrosion resistance and high strength.
Catalogue codeSPR 301 CT
Thixotropic isophthalic polyester resin
Resin chemistryIsophthalic Polyester Resins (SPR 301)
- Manufacturer
- Samrat Poly Resins, Doraha, India
- Nepal supplier and importer
- Samrat FRP Traders
- Technical information issued by
- Samrat Poly Resins (2026 catalogue)
- Price, packaging, lead time in Nepal
- Confirmed on enquiry
About this product
SPR 301 CT is the thixotropic grade of the isophthalic (SPR 301) family. The supplier describes heat, chemical and corrosion resistance with high strength, and lists cooling-tower and wind-energy composite components.
The orthophthalic family has its own cooling-tower grade, SPR 201 CTG. The catalogue’s selection guide names SPR 301 CT as the isophthalic route for the same sag-resistant lay-up.
Samrat FRP Traders handles enquiries for this Samrat Poly Resins, India grade in Nepal. Pricing, packaging and availability are confirmed on enquiry.
What this means for buyers
When the isophthalic route pays
Choose the isophthalic grade when the tower’s water treatment, temperature or chemical exposure calls for more than a general-purpose laminate.
Read the viscosity pair
Thixotropy is published as two viscosities (400–650 cPs at 60 rpm, 1,500–2,000 cPs at 6–12 rpm) and a thixotropic index of 2.0–3.5.
Key features
- Thixotropic isophthalic polyester resin
- For cooling-tower and wind-energy components
- Supplied non-accelerated
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
- Supply condition
- Non-accelerated · thixotropic
- Reference cure system
- MEKP 1.5% + Cobalt Octoate 0.4% — added separately during use
Source: Samrat Poly Resins, India — product catalogue, 2026 edition (typical specification)
How to read these values
- These are typical values from the supplier’s product catalogue. They describe the grade; they are not batch guarantees or acceptance limits.
- Chemical-resistance wording describes the grade’s intended service. It is not a universal compatibility chart; the specific chemical, concentration and temperature decide suitability.
- Resin data does not guarantee the performance of a finished FRP component. Confirm suitability with a trial on your own process, reinforcement and cure conditions.
Applications and processes
Uses listed in the supplier’s catalogue.
- Cooling-tower composite components
- Wind-energy composite components
Limitations
- Heat, chemical and corrosion resistance are stated in words; no service temperature or chemical list is published for the grade.
- The values shown are typical catalogue values for the grade, not batch guarantees, acceptance limits or a Technical Data Sheet. Confirm the current data before relying on a figure.
- Resin data does not describe a finished part. Strength, durability, fire behaviour and chemical resistance of a part depend on its design, reinforcement, process, cure and testing.
When to consider a different resin
These grades are made for a different situation. Match them against your own service conditions.
- Orthophthalic Cooling Tower Grade Resin (SPR 201 CTG)Sag-resistant lay-up on vertical or large surfaces where orthophthalic chemistry is acceptable.
- ISO Polyester ResinA general isophthalic laminate is needed for damp, chemical or outdoor service.
Comparison table
| Criterion | Isophthalic Cooling Tower Grade Resin (SPR 301 CT) | Orthophthalic Cooling Tower Grade Resin (SPR 201 CTG) | ISO Polyester Resin |
|---|---|---|---|
| Chemistry | Isophthalic unsaturated polyester | Orthophthalic unsaturated polyester | Isophthalic unsaturated polyester |
| Supply condition | Non-accelerated · thixotropic | Non-accelerated | Non-accelerated |
| Viscosity | 400–650 cPs (viscosity — 60 rpm) | 350–450 cPs | 500 cPs at 25 °C |
| Gel time | 15–35 minutes at 25 °C | Under 8 minutes | 15 minutes at 25 °C |
| Cure system | MEKP 1.5% + Cobalt Octoate 0.4% — added separately during use | MEKP 1.5% + Cobalt Octoate 0.4% — added separately during use | MEKP with cobalt octoate accelerator |
| Listed uses | Cooling-tower composite components; Wind-energy composite components | Cooling-tower FRP components; Wind-turbine FRP components; Sag-resistant lay-up on vertical surfaces | General FRP in wet or chemically aggressive service |
| Choose when | Sag-resistant lay-up where heat, chemical and corrosion resistance are wanted. | Sag-resistant lay-up on vertical or large surfaces where orthophthalic chemistry is acceptable. | A general isophthalic laminate is needed for damp, chemical or outdoor service. |
Sources: the 2026 product catalogue of Samrat Poly Resins, India for the catalogue grades, and each earlier product’s published Technical Data Sheet summary. Values are typical and were measured under the conditions each source states, so they are a guide to selection, not batch guarantees. Viscosities measured at different spindle speeds or shear conditions are not directly comparable.
Manufacturing and quality context
Samrat Poly Resins manufactures the grade in Doraha, Punjab, India. Its 2026 catalogue presents every grade under its resin chemistry and code and describes a quality inspection laboratory at Doraha. Batch-specific questions, gel-time or viscosity queries and clarification of catalogue values are answered by the manufacturer’s technical team.
The catalogue recommends a trial on the customer’s own process and reinforcement before commercial use: typical values are not a substitute for a trial. Technical and safety data sheets are issued grade by grade: this grade’s Technical Data Sheet is published on this page, and a Safety Data Sheet has not been issued for it here. Ask for the current revision before relying on a document.
Samrat FRP Traders supplies and imports the grade for Nepal and handles enquiries. It does not manufacture, reformulate or certify resins.
Related process guides
These guides are written for another grade. They explain the process; they do not approve this grade for it.
Handling and safety
- Use suitable personal protective equipment and adequate ventilation.
- Store resin, initiators and accelerators separately, in original sealed containers, cool, shaded and away from heat and ignition sources.
- Add the initiator and the accelerator to the resin separately, according to the confirmed process.
- Never mix a concentrated peroxide initiator directly with a cobalt accelerator.
Product details
Applications
Product comparisons
Frequently asked questions
CT or CTG — which do I need?
SPR 201 CTG is orthophthalic; SPR 301 CT is isophthalic, listed with heat, chemical and corrosion resistance. The tower’s service conditions decide.
Does the chemical resistance cover every water treatment chemical?
No. It describes the grade’s intended service, not a universal compatibility chart. Describe the treatment chemicals and temperature when you enquire.
Is a technical or safety data sheet available?
Yes. The supplier’s Technical Data Sheet for this grade is published on this page — Doc. Ref SPR-TDS-ICT, Rev. 01, September 2026, issued by Samrat Poly Resins, India. No Safety Data Sheet has been issued for this grade on this site; ask us and we will request the current one.
What does the thixotropic index of 2.0–3.5 tell me?
The resin is thicker at rest (1,500–2,000 cPs at 6–12 rpm) than when worked (400–650 cPs at 60 rpm), which helps it hold on vertical surfaces.
Is it pre-accelerated?
No. It is supplied non-accelerated and thixotropic; MEKP 1.5% and cobalt octoate 0.4% are added separately.
Knowledge hub
A fuller explanation of this grade’s chemistry, values and limits.
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