Rigour (BrE) or rigor (AmE) (see spelling differences) describes a condition of stiffness or strictness. Rigour frequently refers to a process of adhering absolutely to certain constraints, or the practice of maintaining strict consistency with certain predefined parameters.
PLA stands for polylactic acid and is a resin made from corn starch. PLA is used to make clear compostable containers and PLA lining is used in cups and containers as an impermeable liner. PLA is biodegradable, and fully compostable. It uses 65 percent less energy to produce than conventional oil-based plastics and generates 68 percent fewer greenhouse gasses and contains no toxins.
1 PLA stands for Polylactic acid and is made from corn starch. 2  Lactic acid is made from Dextrose by fermentation. 3  Dextrose is made from corn starch, and corn starch is made from carbon dioxide and water. 4  PLA can be formed into a variety of products. Regular plastic is made from petroleum that is pollutant and have toxins; while PLA is from derived from corn based resin, which is non-toxic and renewable resource. 2  Regular plastic takes approximately 400 years to degrade, leaving toxicity in the environment.