UV-Stabilized Roof Light Resin
SPR 201 RL (UV)UV-stabilized clear orthophthalic roof-light gradeSPR 201 · Orthophthalic Polyester Resins
UV-stabilized clear orthophthalic resin for roof-light sheets exposed to sunlight.
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 201 RL (UV) |
|---|---|
| Resin Chemistry | Orthophthalic unsaturated polyester, UV-stabilized |
| Supply Condition | Non-accelerated |
| Reference Cure System | MEKP 1.5% + Cobalt Octoate 0.4% — added separately during use |
Typical specification
| Appearance | Clear transparent liquid |
|---|---|
| Viscosity | 200–400 cPs |
| Gel Time | 6.5–10 minutes |
| Styrene Content | 30–40% |
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 201 RL (UV) is the UV-stabilized clear orthophthalic roof-light grade of the SPR 201 family, listed for UV-stabilized clear roof-light sheets, sunlight-exposed translucent roofing panels and industrial daylighting applications. It is supplied non-accelerated and cured with MEKP and cobalt octoate added separately during use. It is a clear grade and a different product from the pre-pigmented UV Stabilized Sheet Grade Yellow Resin.
For roof-light sheet that is not facing sustained sunlight, the catalogue lists Roof Light Sheet Grade Resin (SPR 201 RL). For a coloured, pre-pigmented outdoor sheet, see UV Stabilized Sheet Grade Yellow Resin. UV-stabilized means the cured sheet carries a light-stabilising package; the resin still cures with MEKP and cobalt, not under a UV lamp.
Key features
- UV-stabilized clear orthophthalic roof-light grade (SPR 201 RL (UV))
- Clear transparent liquid — not pre-pigmented
- Typical viscosity 200–400 cPs and gel time 6.5–10 minutes
- Supplied non-accelerated; MEKP and cobalt octoate added during use
Applications
- UV-stabilized clear roof-light sheets
- Sunlight-exposed translucent roofing panels
- Industrial daylighting applications
Product role
The SPR 201 sheet group has three grades, and the catalogue separates them by what the sheet faces: SGY for general coloured sheet, RL for translucent roof-light sheet, and RL (UV) where the roof-light sheet is exposed to sunlight.
A stabilised resin is one part of a sheet's weathering behaviour. Glass content, laminate construction, surfacing veil or film and the exposure site all matter, and accelerated-weathering hours do not convert into a service life in years. Confirm the finished-sheet requirement with the technical team before selecting a grade.
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 201 RL (UV) is a clear sheet grade. Its role is translucent roof-light sheet that will face sunlight in service.
| Process or use | Role of this grade | What to confirm |
|---|---|---|
| Continuous or batch roof-light sheet production | Listed role | Glass content, sheet profile, surfacing film or veil and cure on the actual line |
| Hand-laid translucent roofing panels | Listed role — sunlight-exposed panels | Air removal and uniform wet-out, because trapped air shows in a translucent sheet |
| Industrial daylighting panels | Listed role | The exposure site and the light-transmission requirement of the finished panel |
| Roof-light sheet not exposed to direct sun | Consider SPR 201 RL | The standard Roof Light Sheet Grade Resin |
| Coloured, opaque sheet | Not this grade’s role | Sheet Grade Yellow Resin or its UV-stabilised version |
Process-selection considerations
- Start with exposure. The catalogue separates RL for translucent roof-light sheet from RL (UV) for roof-light sheet exposed to sunlight.
- Treat the resin as one part of the sheet’s weathering behaviour. Glass content, laminate thickness, surfacing and the site all contribute.
- Ask for what the buyer of the sheet actually requires — a light-transmission figure, a colour-change limit, a test standard — and share it when enquiring.
- The gel time, 6.5–10 minutes typical at the reference cure, sets the line speed or lay-up window. Confirm it on the real line temperature.
- SPR 201 RL (UV) is supplied clear, not pre-pigmented. Any tint added later changes light transmission and should be part of the trial.
Limitations and trial requirements
- The catalogue publishes appearance, viscosity 200–400 cPs, gel time 6.5–10 minutes and styrene 30–40%. It does not publish a weathering result, a light-transmission value, a stabiliser system or a service life for this grade.
- UV-stabilised means the resin is formulated to resist sunlight degradation. It does not mean it cures under UV light, and it is not a guarantee against yellowing in every climate.
- Accelerated-weathering hours from any test cannot be converted into years of roof service. Finished-sheet claims need finished-sheet testing.
- 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.
