The polymers is usually an epoxy, vinylester or polyester thermosetting plastic, though phenol formaldehyde resins are still in use.
ໂພລີເມີແມ່ນປົກກະຕິແລ້ວເປັນກົດເອເລັກໂຕຣນິກ, vinylester ຫຼື polyester thermosetting plastics, ເຖິງແມ່ນວ່າຝຸ່ນ phenol formaldehyde ແມ່ນຍັງຢູ່ໃນການນໍາໃຊ້.