A polymeric solid foam float is manufactured by plastic injection moulding method by mixing of CBAs, nucleating agent and lubricating agent to the polyamide polymer granules and moulding is done on machine with nozzle having shut-off valve. The mould is having plurality of runners and gates. A vent in a form of gap is configured between upper plate and lower plate encompassing runners and gates for venting the gases evolved during the moulding processes from the moulding cavity.