American-made structural aircraft-grade plywood is made of imported African Mahogony or American Birch veneers laminated in a hot press to hardwood cores of Poplar or Bass wood with waterproof glue. Will meet all requirements of specification MIL-P-6070, which calls for shear testing after immersion in boiling water for 3 hours. Far superior to many plywoods in which all plies are 1/16 inch thick and laminated in a cold press to make up the total thickness. Tests should be made on cold press plywoods before use on aerobatic aircraft. Available in 45 and 90 degree.