Terephthalic resin for sheet-moulding-compound production with high heat-resistant capacity.
- Viscosity
- 800–1,500 cPs at 25 °C
Price on RequestTDS
Resin chemistry · SPR 401 series
Terephthalic Polyester Resins — SPR 401
Terephthalic polyester resins use terephthalic acid, the para isomer of the phthalic acids, in the polyester backbone. In the catalogue they form the SPR 401 series: resins for sheet and dough moulding compounds, a fire-retardant gelcoat for transport components and a pultrusion grade. Samrat Poly Resins manufactures them at Doraha, Punjab.
The catalogue describes the terephthalic SMC resin as having high heat-resistant capacity, good resistance to corrosive chemicals and excellent mechanical and impact properties, and the pultrusion grade as high-strength. Grade-specific values are on each product page.
4Published
Grades
Grades
SPR 401 · 2 grades
SMC and DMC grades
Separate products, each with its own specification.
Terephthalic resin for dough-moulding-compound production, with its own specification.
- Viscosity
- 1,200–2,200 cPs at 25 °C
Price on RequestTDS
SPR 401 · 1 grade
Fire-retardant gelcoat grade
Thixotropic terephthalic fire-retardant gelcoat for the mould-face surface of fire-retardant FRP components.
- Viscosity
- 12,000–18,000 cPs
- Gel Time
- 12–22 minutes at 25 °C
Price on RequestTDS
SPR 401 · 1 grade
Pultrusion grade
High-strength terephthalic grade with excellent mechanical properties for continuous pultrusion.
- Viscosity
- 300–600 cPs at 25 °C
Price on RequestTDS
SPR 401 code-range exception
SPR 401 code-range exception: SPR 401 TL, Tooling Grade Resin, is retained within the SPR 401 code range but is an isophthalic NPG-based polyester resin, not a terephthalic resin. It is listed with the isophthalic polyester resins.
View Tooling Grade Resin (SPR 401 TL, isophthalic)Terephthalic grades compared
Typical values from each grade's published data sheet, for shortlisting. They are not guaranteed properties of a finished part.
| Grade | Viscosity | Gel time | Data sheet |
|---|---|---|---|
| Terephthalic SMC ResinSPR 401 SMC | 800–1,500 cPs at 25 °C | See data sheet | TDS |
| Terephthalic DMC ResinSPR 401 DMC | 1,200–2,200 cPs at 25 °C | See data sheet | TDS |
| Terephthalic Fire-Retardant Gelcoat ResinSPR 401 FRGC | 12,000–18,000 cPs | 12–22 minutes at 25 °C | TDS |
| Pultrusion Grade ResinSPR 401 PT | 300–600 cPs at 25 °C | See data sheet | TDS |
Choosing a grade
How to choose within terephthalic polyester resins
Moulding compounds
Choose the SMC or DMC family by the chemistry the compound needs. SPR 401 SMC and SPR 401 DMC are the terephthalic options; the isophthalic (SPR 301) and orthophthalic (SPR 201) families also have SMC/DMC resins.
Pultrusion
SPR 401 PT is cured in the heated die with a heat-activated peroxide blend — 40 to 80 seconds at 130–140 °C — not with the ambient MEKP and cobalt system.
Fire-retardant surfaces
SPR 401 FRGC is the terephthalic fire-retardant gelcoat for rail, transport and automotive components; pair it with the fire-retardant laminating resin of the project.
Heat and chemical resistance claims describe the resin family, not a finished part. Compound design, cure and the tested construction decide performance, and fire-retardant grades carry no certified rating unless a test result is supplied.
Process guides
Application guides
Guides
Read before you specify
DMC vs SMC: What Industrial Buyers Should VerifySeparate the published Dough Moulding Compound and Sheet Moulding Compound terminology, understand the limits of the current product data, and prepare a more specific DMC or SMC resin enquiry.What Is DMC / SMC Resin? A Moulding-Compound Buyer GuideUnderstand Samrat Poly Resins' published orthophthalic UPR route for Dough Moulding Compound and Sheet Moulding Compound requirements, including what the current TDS does and does not establish.SMC Resin vs Sheet Grade Resin: Different Product RolesLearn why Sheet Moulding Compound resin is not the same product decision as conventional FRP Sheet Grade Resin for sheet and panel manufacturing.Types of Unsaturated Polyester Resin: A Grade-Selection GuideA product-role guide for buyers comparing standard UPR, GP, lamination, gelcoat, button, fire-retardant and vinyl ester options without treating them as interchangeable.
Other resin chemistries
Browse by resin chemistry
SPR 201 · Orthophthalic Polyester ResinsSPR 201 orthophthalic (ortho) unsaturated polyester resins made at Doraha, Punjab: general-purpose, casting, sheet, SMC/DMC, fire-retardant and gelcoat grades.SPR 301 · Isophthalic Polyester ResinsSPR 301 isophthalic (ISO) polyester resins made at Doraha, Punjab, for water, chemical and outdoor service: tank-lining, filament-winding, SMC/DMC, rock-bolt and gelcoat grades.SPR 501 · Vinyl Ester ResinsVinyl ester resin family (SPR 501): when corrosion-resistant FRP linings and chemical-service structures call for vinyl ester instead of isophthalic polyester.FRP resin by jobStart from the part you make and find the matching grade and data sheet.Resin selectorAnswer a few questions about the process and part to shortlist grades.
Ordering terephthalic resin: questions buyers ask
Choose the grade, send the quantity and delivery location, and we reply with a quotation. Call +91 74638 81652, message us on WhatsApp +91 74638 81005 or email info@samratpolyresins.in.
4 published grades: Terephthalic SMC Resin, Terephthalic DMC Resin, Terephthalic Fire-Retardant Gelcoat Resin and Pultrusion Grade Resin. Each is manufactured at Doraha, Ludhiana, Punjab.
Prices are quoted on request, for your grade, monthly quantity and delivery location. Send those details on WhatsApp (+91 74638 81005), call +91 74638 81652 or email info@samratpolyresins.in. How ordering works.
Yes. Terephthalic SMC Resin, Terephthalic DMC Resin, Terephthalic Fire-Retardant Gelcoat Resin and Pultrusion Grade Resin each link a technical data sheet (PDF) with the published specification.
Yes. Supply covers Punjab, Haryana, Delhi, Uttar Pradesh, West Bengal, Bihar, Jharkhand, Odisha, Assam and Andhra Pradesh, with exports to Nepal, Bangladesh, Ethiopia, Cameroon and South Africa.
Traders and distributors can send a dealer enquiry with their firm, location and expected monthly volume on the dealer and distributor enquiries page.
Enquiry
Discuss a terephthalic resin requirement
Tell us the process, the finished part, the service condition and the quantity, and the technical team can suggest a starting grade to trial. Samrat Poly Resins manufactures at Doraha, Punjab. Pricing is on request.