Unsaturated Polyester Casting Resin

Primary uses

• Filled decorative casting
• Cultured marble and cast stone production
• Low-cost volume casting

Applications

• Cast marble vanity tops, basins and panels
• Filled decorative castings and architectural elements
• Volume casting where cost per unit dominates
• Solid surface and simulated stone systems

Advantages

• Lowest cost per filled unit among the common casting chemistries, which is decisive in volume decorative production
• Accepts very high mineral filler loadings, which is exactly what cultured marble production needs
• Well-established process knowledge in the Canadian cast marble and solid surface trade

Limitations to consider

• Styrene emission requires engineered ventilation and worker protection, which is a plant-level commitment
• Requires peroxide initiation, adding a separate hazardous material to the process and to storage
• Higher shrinkage than epoxy systems, which affects dimensional and surface outcomes on some geometries
• Mix ratio, pot life, working time, demould time, full-cure schedule, hardness, tear strength, elongation, shrinkage, viscosity and temperature resistance are properties of one specific supplier system. They are never quoted here from memory or by analogy with a similar product; they are read from the supplier data sheet for the exact material offered and confirmed at quotation.

How to choose the right grade

• Start from the part: section thickness, required appearance, and whether it is a prototype, a short production run or a structural element
• State the mould the material will be cast or laminated into, because mould material and resin chemistry have to be compatible
• Describe the shop — mixing method, ventilation, temperature and whether the process is poured, sprayed or laid up by hand
• State the filler type and the loading the plant runs, since that is what the resin has to wet out
• Confirm the initiation system the plant is set up for before comparing products
• Mould-making and casting behaviour depends on the pattern, the shop temperature and humidity, the mixing method and the operator. A production-representative trial on your own pattern and in your own shop conditions is the only honest way to qualify a material before a run is committed.
• Exact specification is confirmed against supplier documentation at quotation.

Typical grades

• Filled casting products intended for cultured marble and decorative work
• Products the supplier distinguishes by reactivity and filler acceptance
• Pre-promoted and unpromoted products depending on how the plant initiates
• Buyers search this category by grade name, and those names describe what the workshop needs rather than what is asserted here. Which grade a specific offer corresponds to, and what the supplier declares for it, is read from the technical documentation issued for the exact material quoted.
• Materials in this category interact: rubbers, releases, sealers, resins, pigments and fillers can inhibit cure, stain a surface or shorten mould life when they are combined outside the combinations the supplier has tested. State every material already in the process at enquiry so compatibility is checked against supplier documentation rather than discovered on the shop floor.
• Reactive materials age in the container, and moisture-sensitive systems age faster once opened. Order against real consumption rather than against a discount, and confirm the shelf life the supplier states for the exact product and pack.