Quick facts
- UPR
- Broad unsaturated polyester resin family
- ISO FR
- Published specialised isophthalic-based FR grade within that family
- Ordinary isophthalic resin
- No separate general isophthalic product is listed in this repository
- Selection rule
- Choose the grade against the stated product and system requirement
Use the product-family hierarchy
Unsaturated Polyester Resin, or UPR, is the broad resin family. The current ISO Fire Retardant Resin TDS places this product within that family and describes an isophthalic-based fire-retardant grade.
This is not a comparison between unrelated materials. The useful question is whether the finished component and project requirement call for this specialised ISO FR product route rather than another published UPR grade.
Do not invent a missing general-isophthalic comparison
The repository does not list a separate ordinary isophthalic resin product. It would therefore be misleading to publish a performance comparison or imply how an unlisted grade behaves. Isophthalic terminology alone does not establish fire performance, project compliance or service suitability.
If a specification names isophthalic chemistry, keep that wording in the enquiry and review the current ISO FR TDS alongside the complete project requirement.
Select a published grade for the actual purpose
Use the UPR family page for broad resin-grade orientation, standard Fire Retardant Resin for the separately published FR route, and Vinyl Ester for its separately published product category. Product names do not replace grade-specific documentation or a finished-system requirement.
Frequently asked questions
Is ISO Fire Retardant Resin a UPR?
Yes. The current TDS identifies it as an Unsaturated Polyester Resin, Fire Retardant Grade. The ISO designation adds an isophthalic-based chemistry descriptor; it does not make it a separate resin family.
Is normal isophthalic resin automatically fire retardant?
No. Isophthalic chemistry and a fire-retardant product designation are separate matters. This repository does not list a general isophthalic resin product for a direct product-to-product comparison.