What the ISO Polyester Resin data sheet covers
The current data sheet is SPR-TDS-IPR, revision 01, dated September 2026. It groups the grade's data under identity and supply, liquid-resin properties, the cure system used for the published tests, cured-resin properties, and safety and storage.
Every value on it is described as typical for this grade and not a guaranteed limit, and properties can vary between batches within normal manufacturing tolerance. Use the sheet to identify the material and compare like with like, then confirm anything critical for your component directly.
Liquid-resin values: what arrives in the drum
Viscosity, gel time, peak exotherm, specific gravity, styrene content and acid value describe the liquid resin. They matter for wet-out, handling, how fast a batch moves from liquid to gel at the stated test conditions, and for incoming checks on a delivery.
Two of these are easy to over-read. Viscosity is quoted at 25 °C, so a reading taken in a hot or cold workshop will differ. The 15-minute gel time and the 190 °C peak exotherm come from the sheet's own catalyst and accelerator dosage at 25 °C; they describe that test, not the working time or heat build-up in your mould, laminate thickness and ambient temperature.
Cured-resin values describe the resin, not your laminate
The heat deflection temperature, tensile and flexural values, elongation, Barcol hardness and water absorption are all marked as cured-resin properties. They describe the resin cured on its own, without glass reinforcement.
A finished FRP part is a different material. Its strength and stiffness depend on the reinforcement type, glass content, lay-up, void content, degree of cure and any post-cure. The sheet does not state the test methods or specimen conditions for these values, so ask for them before setting the figures beside another supplier's data.
Values that are easy to misread
90 °C is not a service temperature. Heat deflection temperature is a short test of the cured resin under a set load. It does not tell you how a laminate behaves when held at temperature for months in contact with water or chemicals.
0.15% water absorption after 24 hours is not an immersion rating. It is a short-term absorption figure for the cured resin. Long-term water or chemical service depends on the laminate, its cure and the service conditions.
ISO does not mean ISO 9001. In resin names, ISO is short for isophthalic. Samrat Poly Resins' quality management system is certified to ISO 9001:2015, which is a separate matter.
What the data sheet does not cover
The sheet does not include a chemical-resistance chart, a potable-water or food-contact approval, a fire-performance rating, or any statement about the life of a finished component. None of those can be inferred from the values above.
It refers to the applicable safety data sheet before handling. A safety data sheet for this grade is not part of the published document library on this site, so request it with your enquiry. The minimum order quantity is not stated on the sheet either; it is confirmed with the quotation.
Turning the data sheet into an enquiry
When you send an enquiry, describe the finished component, the medium it will contact with its concentration and temperature, the process (hand lay-up, spray-up, filament winding), the laminate construction, whether you can post-cure, the quantity in 225 kg drums and the delivery location.
That lets the grade be confirmed against your duty rather than against a single number on the sheet. If the duty is routine dry FRP work, the general-purpose orthophthalic grades are usually the route; for aggressive chemical service, vinyl ester resin is reviewed as well.