Material basics

Unsaturated polyester resin (UPR) is one of the resin groups used in composite manufacturing. For a purchasing or production team, the useful starting point is the finished part and its manufacturing process. A product-family name helps you narrow the discussion; the grade is selected for the actual application.

Use this guide to understand the role of UPR, identify the information to prepare and choose your next step. For a closer review of processing and service conditions, continue to the FRP resin selection guide.

What is UPR resin?

UPR stands for unsaturated polyester resin. In composite production, resin forms the matrix that binds reinforcing fibers, fillers and other components. The resin and reinforcement work together to give the finished part its shape and performance.

The relevant resin characteristics depend on the application. Processing time, viscosity, reinforcement wet-out, surface finish and the service environment all help narrow the product direction.

Why purchasing and production should review it together

A resin is evaluated with the equipment, process, reinforcement and finished-part requirements. Technical data helps compare candidates; a representative trial shows how the selected material behaves in your production conditions.

Purchasing information completes that technical picture: which product and grade are being requested, the quantity and unit, the destination, the documents needed and the preferred contact channel.

Start from the application

UPR resins are used across FRP and composite applications, including sanitary ware, profiles made by pultrusion, marine components, water-park parts, buttons and other molded products. Different applications place different demands on the material system.

Browse the current product range or the Product × Application guide to find a useful direction. Describe your finished part and process when discussing a grade with SIHE.

Prepare a useful first enquiry

The finished part or application and the manufacturing or repair process.
The main surface, mechanical or service-environment requirements.
A known product/grade, or a request for help choosing one.
Estimated quantity, unit and delivery country.
Documents or sample evaluation needed, plus your preferred contact channel.

A brief, specific description is enough to start. Use the selection guide to develop the technical details or the RFQ preparation worksheet to organize the enquiry.

Use the right document for the question

A general catalogue introduces the range. A TDS supports review of product characteristics and stated test conditions. An SDS communicates the safety information for the identified product and market. A batch COA relates to the relevant order or batch.

Visit the Downloads Center for public catalogues and supplier documents. The document guide explains which details to check when asking for a TDS, SDS or COA.

Choose your next step

SIHE can help narrow the material direction and review the exact grade, documents and supply requirements. Tell us what you are making, how you make it and where the material will be delivered.

For an application question, ask for technical support. If you already have a product and purchasing requirement, prepare an RFQ.