A thermoformed disposable food container having a wall caliper of from
about 10 to about 80 mils consisting essentially of from about 30 to
about 80 percent by weight of a matrix polymer composition consisting
predominantly of a polypropylene polymer and optionally including a
polyethylene polymer, from about 10 to about 50 percent mica, from about
2.5 to about 25 percent calcium carbonate, and up to about 5 weight
percent titanium dioxide, exhibits enhanced rigidity when the calcium
carbonate has a mean particle size of less than about 8 microns. The
extrudable compositions are likewise useful for film, sheet and injection
molding applications.