ISO Resins
Tooling Grade Resin
A Samrat Poly Resins, India grade, SPR 401 TL. Enquire with Samrat FRP Traders for supply, pricing and packaging in Nepal.
Price
PRICE ON REQUEST
Tooling 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
Highly reactive, high-molecular-weight isophthalic NPG (neopentyl glycol)-based polyester resin for composite mould production.
Catalogue codeSPR 401 TL
Isophthalic NPG-based polyester resin (SPR 401 code range)
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 401 TL is a highly reactive, high-molecular-weight isophthalic NPG (neopentyl glycol)-based polyester resin for composite mould production. The supplier lists composite mould production and tooling and die preparation.
Its code sits in the SPR 401 range, but it is not a terephthalic resin. It is isophthalic, and it is classified here under Isophthalic Polyester Resins.
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
Isophthalic, whatever the code
Do not read the SPR 401 code as terephthalic. SPR 401 TL is an isophthalic NPG-based grade.
For moulds
The grade is listed for composite mould production and tooling. It is supplied non-accelerated and moderately thixotropic.
Key features
- Isophthalic NPG-based polyester resin
- For composite mould production and tooling
- Supplied non-accelerated, moderately thixotropic
Typical specification
- Appearance
- Opaque, cloudy to milky liquid
- Viscosity — 60 rpm
- 400–650 cPs
- Viscosity — 6 rpm
- 1,500–2,500 cPs
- Thixotropic index
- 2.5–3.8
- Gel time
- 15–30 minutes at 25 °C
- Specific gravity
- 1.12–1.16
- Styrene content
- 35–42% by weight
- Supply condition
- Non-accelerated · moderately 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
- SPR 401 TL is an isophthalic NPG-based resin kept within the SPR 401 code range. It is not a terephthalic resin.
- These are typical values from the supplier’s product catalogue. They describe the grade; they are not batch guarantees or acceptance limits.
- 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.
- Composite mould production
- Tooling and die preparation
Limitations
- No mould-life figure is published. Mould life and surface quality depend on the pattern, mould gelcoat, laminate schedule, cure and use.
- 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.
- ISO Polyester ResinA general isophthalic laminate is needed for damp, chemical or outdoor service.
- GP Clear ResinThe work is general-purpose FRP with no special service condition.
Comparison table
| Criterion | Tooling Grade Resin (SPR 401 TL) | ISO Polyester Resin | GP Clear Resin |
|---|---|---|---|
| Chemistry | Isophthalic NPG-based polyester (SPR 401 code range) | Isophthalic unsaturated polyester | Orthophthalic unsaturated polyester |
| Supply condition | Non-accelerated · moderately thixotropic | Non-accelerated | Non-accelerated |
| Viscosity | 400–650 cPs (viscosity — 60 rpm) | 500 cPs at 25 °C | 350–450 cPs |
| Gel time | 15–30 minutes at 25 °C | 15 minutes at 25 °C | Under 8 minutes |
| Cure system | MEKP 1.5% + Cobalt Octoate 0.4% — added separately during use | MEKP with cobalt octoate accelerator | MEKP + cobalt octoate, dosed at the workshop |
| Listed uses | Composite mould production; Tooling and die preparation | General FRP in wet or chemically aggressive service | General-purpose hand lay-up, spray-up, moulding and lamination |
| Choose when | Building composite moulds and tooling. | A general isophthalic laminate is needed for damp, chemical or outdoor service. | The work is general-purpose FRP with no special service condition. |
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.
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
Is SPR 401 TL a terephthalic resin?
No. It is an isophthalic NPG-based resin that keeps a code in the SPR 401 range.
What is NPG?
Neopentyl glycol, the glycol used to build this polyester.
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-TLR, 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.
Why is an isophthalic grade coded SPR 401?
The catalogue retains SPR 401 TL within the SPR 401 code range and states that it is not a terephthalic grade.
How thixotropic is it?
Moderately: the catalogue lists a thixotropic index of 2.5–3.8, with 400–650 cPs at 60 rpm and 1,500–2,500 cPs at 6 rpm.
Knowledge hub
A fuller explanation of this grade’s chemistry, values and limits.
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