It’s an open secret in the plastic injection molding industry that re-grind resin is often added during injection. Some manufacturers even claim that, given the current competitive environment and cost-cutting pressures, it’s impossible to make a profit without using some re-grind resin. Plus, they argue it promotes recycling and aligns with today’s emphasis on environmental sustainability. However, from a quality perspective, adding re-grind resin introduces risks of reduced strength and increased brittleness in the structure of plastic products.
