Flame retardant PU foam for NVH engine bay applications

Woodbridge says the material represents a breakthrough in flammability performance for noise, vibration and harshness (NVH) solutions, offering enhanced sound absorption and transmission loss properties, versus competing materials including metals and engineered fibres.

WhisperTech V0 foams now provide good engine-bay sound management capabilities, while exceeding industry regulations for flammability of polymeric materials. According to the company, the UL-94 V0-rated foams self extinguish, once exposed to an open flame, in both horizontal and vertical test protocols. This formulation can also be specifically engineered to meet specifications including: colouring including black, heat ageing, humidity ageing, and no-drip performance. WhisperTech foams can be fabricated in mechanically cut sheets or moulded into custom fit complex geometries to meet exacting levels of acoustical performance.

Domenic Sinopoli, Executive Director of Sales and General Manager StrataForm, Woodbridge, states “WhisperTech UL-94 V0-rated, low density flexible urethane formulations are used to balance cost and NVH performance requirements for hood liners and dash insulators. This solution also offers excellent thermoforming performance, using a variety of face materials to optimise the finished product.”

Pejman Hashemi, WhisperTech NVH Solutions Product Manager, Woodbridge, notes “These extreme flame retardant formulations are available for a wide range of moulded components in contact with the engine such as: beauty covers and various acoustical insulators for manifolds, valve and cam covers, fuel rails, air intakes, and pumps. Additionally, these products can integrate fasteners and mounting brackets for ease of assembly.”

WhisperTech V0 foams are available in a wide range of density, hardness and thickness.