The Original TEC Trim�, MiraTEC Treated Exterior Composite trim is manufactured through the original TEC process and combines the eye-catching beauty of authentic woodgrain with the long-lasting performance of an engineered product. Because it is not hardboard, MiraTEC trim will not delaminate, is moisture, rot and termite resistant, and is backed by a 50-year limited warranty. Moisture resistant: As measured by ASTM D1037 for water absorption and thickness swelling. Rot resistant:Tested per AWPA E16 Field Test for Evaluation of Wood Preservatives to be Used Out of Group Contact: Horizontal Lap-Joint Method. Termite resistant: As measured by AWPA E7 Standard Method of Evaluating Wood Preservatives by Field Tests with Stakes.