Terephthalic SMC Resin
SPR 401 SMCTerephthalic sheet moulding compound resinSPR 401 · Terephthalic Polyester Resins
Terephthalic resin for sheet-moulding-compound production with high heat-resistant capacity.
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 401 SMC |
|---|---|
| Resin Chemistry | Terephthalic unsaturated polyester |
| Compound Type | Sheet moulding compound (SMC) |
| Supply Condition | Non-accelerated |
| Reference Cure System | MEKP 1.5% + Cobalt Octoate 0.4% — added separately during use |
Typical specification
| Appearance | Clear to slightly hazy, pale-yellow to light-amber liquid |
|---|---|
| Viscosity | 800–1,500 cPs at 25 °C |
| Gel Time | 12–18 minutes at 25 °C (ambient QC) |
| Specific Gravity | 1.11–1.15 |
| Styrene Content | 32–38% 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 401 SMC is the terephthalic sheet moulding compound resin of the SPR 401 family. The catalogue describes it as having high heat-resistant capacity, good resistance to corrosive chemicals and excellent mechanical and impact properties, and lists it for sheet moulding compound production, compression-moulded composite components and hot-mould processing. It is supplied non-accelerated, with MEKP and cobalt octoate added separately during use.
The terephthalic dough moulding compound resin is a separate product with its own specification: Terephthalic DMC Resin. SMC resins in the other families: Isophthalic SMC Resin and the orthophthalic DMC/SMC Resin.
Key features
- Terephthalic resin for sheet moulding compound (SPR 401 SMC)
- High heat-resistant capacity and good resistance to corrosive chemicals, per the catalogue
- Excellent mechanical and impact properties, per the catalogue
- Typical viscosity 800–1,500 cPs; ambient QC gel time 12–18 minutes at 25 °C
Applications
- Sheet moulding compound production
- Compression-moulded composite components
- Hot-mould processing
Product role
SPR 401 SMC is the terephthalic option in the catalogue's SMC range. The selection guide chooses the SMC family by the chemistry the compound requires — orthophthalic, isophthalic or terephthalic — rather than presenting one as a universal upgrade.
The gel time is an ambient quality-control figure at 25 °C; hot-mould cure is set by the compound's initiator system and tool temperature, which belong to the compounder.
Supply and cure
- Supply condition
- Non-accelerated
- Reference cure system
- MEKP 1.5% + Cobalt Octoate 0.4% — added separately during use
Processes and where this grade fits
SPR 401 SMC is the terephthalic resin in the catalogue’s SMC range, for sheet moulding compound and hot-mould compression moulding.
| Process or use | Role of this grade | What to confirm |
|---|---|---|
| SMC paste and sheet production | Listed role | Filler, thickener and glass content, and maturation behaviour |
| Compression moulding of SMC components | Listed role | Tool temperature, press cycle and the compound initiator |
| Hot-mould processing | Listed role | Part geometry and flow in the tool |
| DMC compounding | Consider SPR 401 DMC | The separate terephthalic DMC resin, with its own specification |
Process-selection considerations
- The catalogue describes the terephthalic SMC resin as having high heat-resistant capacity, good resistance to corrosive chemicals and excellent mechanical and impact properties. Test those needs on the moulded part.
- Choose the family by the compound’s requirement rather than treating terephthalic as a universal upgrade.
- Viscosity is 800–1,500 cPs at 25 °C typical; check paste viscosity at your filler loading.
- The gel time, 12–18 minutes at 25 °C, is an ambient QC figure; hot-mould cure is the compound’s.
- Share the moulded part and any specification it must meet.
Limitations and trial requirements
- The heat, chemical and mechanical wording is the catalogue’s qualitative description. No numerical heat-deflection, chemical or mechanical values are published for SPR 401 SMC.
- Moulded-part performance depends on the compound design, glass content and moulding conditions.
- The MEKP 1.5% and cobalt octoate 0.4% figures are the ambient quality-control condition for the resin, not a moulding recipe.
- 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.
