... flame retardent technics. ACQ Preservative Treated Timber :1. Treated by carbonizing, which makes the timber have obvious grain, elegant color and wood ... fragrance. 2. Treated by high quality ACQ, which makes the timber be insect-proofing, anticorrosive and eco-friendly as well.3 ... . Adopt the advanced flame retardent technics, which makes the timber have the feature of flame retardent. ACQ ...