rigorous (Adjective). Manifesting, exercising, or favoring rigour; allowing no abatement or mitigation; scrupulously accurate; exact; strict; severe; relentless; as, a rigorous officer of justice; a rigorous execution of law; a rigorous definition or demonstration. rigorous (Adjective). Severe; intense; inclement; as, a rigorous winter.
Polylactic acid or polylactide (PLA, Poly) is a biodegradable thermoplastic aliphatic polyester derived from renewable resources, such as corn starch (in the United States and Canada), tapioca roots, chips or starch (mostly in Asia), or sugarcane (in the rest of the world).eing able to degrade into innocuous lactic acid, PLA is used as medical implants in the form of anchors, screws, plates, pins, rods, and as a mesh. Depending on the exact type used, it breaks down inside the body within 6 months to 2 years.
Plywood products are made of thin layers of wood which are glued together into sheet. or siding. Pine and cedar are probably the most common woods used. Common. plywood is usually sanded smooth. T-1-11 siding is rough or textured with open. grooves cut down the length of the panel. Other types of plywood products include: MDO (medium density overlay) and HDO (high density overlays) plywood overlays, and. brushed and abraded plywood.