Villalva, S., Alegre, G., Moura, T., Windlin, F. et al., "Air Intake Manifolds Manufactured with Chemically Recycled Material Achieve a Reduction of CO2 Emissions and Costs Saving with Similar Mechanical Resistance," SAE Technical Paper 2012-36-0368, 2012, doi:10.4271/2012-36-0368.
In the current Brazilian air intake manifold market, most of the small car applications use the reinforced polyamide PA 6.6 GF30 as base material. The glass fiber (30%) guarantees the required mechanical resistance, necessary once the manifold is assembled on the engine and is subjected to considerable vibration levels.Air intake manifolds were developed using a new chemically recycled material recuperated from yarn production process, called Technyl ECO, which represents a reduction of 4.3 kg of CO₂ equivalent per 1 kg of polyamide produced. This material can replace the current one, once it has the same formulation (PA 6.6 GF30) and similar mechanical resistance. Moreover, it represents a cost saving up to 10% in the raw material.The air intake manifolds injected with the recycled material were subjected to the mechanical validation tests under severe conditions of accelerated aging at temperature of 140°C and thermal shock with abrupt temperature change from -40°C to 120°C. All samples were approved according to the specifications for life under vibration, metallic inserts extraction, bursting, pressure drop and impact.