Button Grade Resin

Button Grade Resin is a transparent, semi-liquid unsaturated polyester casting resin formulated for manufacturing buttons and other small decorative mouldings. It is a casting/moulding grade, not a laminating resin — it is poured or cast into moulds rather than used with fibreglass reinforcement.

Button manufacturing needs a resin that casts clear and hard, with a fine surface that takes a high polish, since the cast part itself is the finished, visible product. Button Grade Resin is formulated specifically for this clarity and surface finish, rather than for structural strength or reinforcement wet-out.

General-purpose resin (such as our GP Clear Resin or UPR) is designed to saturate and bind fibreglass reinforcement for structural FRP laminates. Button Grade Resin is a casting grade, used on its own without reinforcement, formulated for clarity, hardness and polishability rather than laminate strength.

Gel time is 9.5 minutes. Full cure at room temperature, once catalysed with MEKP (around 1.5%) and a cobalt octoate accelerator (around 0.1%), takes approximately 2 hours.

Viscosity is approximately 1,100 cPs and styrene content is 33%.

Shelf life is 2 months from manufacture. Store between 30–35 °C, away from direct heat and sunlight.

It is supplied in bulk 225 kg drums.

Please share the expected quantity, whether the requirement is for buttons or another small decorative moulding, the clarity or pigment-colour requirement, the casting or moulding method if known, and delivery location. This helps the sales team understand the requirement before preparing a quote.

Button Grade Resin is the published casting grade for buttons and small decorative mouldings. For reinforced FRP production, review GP Clear Resin or Unsaturated Polyester Resin; for pre-pigmented FRP sheet and panel production, review Sheet Grade Yellow Resin. Where a two-part epoxy system is specified, review Clear Casting Resin and its separate technical data.