Eco-Certfied Composites Eco-Certified™ Composites (ECC) are among the greenest on the earth. The ECC sustainability standard is a voluntary industry certification developed and administered by the Composite Panel Association (CPA) for manufacturers of composite wood or agrifiber-based panels, including particleboard, medium density fiberboard (MDF), hardboard, engineered wood siding, and engineered wood trim. ECC Certification is available to … Continue reading ECC