The performance behind G10 and GPO-3 insulating material’s laminating plastic will help you understand why they are specified for different tasks. Here are several important differences between the epoxy used to laminate G10 and the polyester resin used to laminate GPO-3.
Epoxy is known for its bonding capabilities. Epoxy can hold up to 2,000 lbs. per sq. in., while polyester resin is less than 500 lbs. per sq. in.
Epoxy is resistant to peeling, cracking and resistance to chemicals and environmental exposure. Polyester is much more fragile and used for temporary fixes and low-stress applications.
Epoxy is more expensive than resin, due to its formulation requirements.
Epoxy is moisture resistant, and can even be used underwater. Polyester resin is considered water-permeable.
Depending on the formulation and temperature, resin generally has a faster cure time. Lowering or raising the ambient temperature can change both products’ cure time. Some epoxy formulations can be used at extreme temperatures.
Although it sets up much faster, polyester can stink enough to inflame your nose! Use outside or with specified ventilation and protection filters when applying both epoxies and resins.
Epoxy has a much longer shelf life than polyester. If it hasn’t been mixed, epoxy can last for many years without losing its potency. Resin is more fragile over time.
Now you know a bit more why GPO-3 may be less expensive but also used for less demanding applications and why G10 is just about indestructible and that sometimes the price reflects that.
Monti Inc. is a custom G10 and GPO-3 electrical insulation material fabricator, and copper fabrication manufacturer that has the expertise to produce complex electrical component fabrications to the tightest tolerances and highest quality control. We'll also help you value engineer your part to shorten lead times while increasing the value of the component.