Compositions that include mixtures of at least one dialkyl quat in the amount of from about 10% to about 90% by weight of the composition; and at least one monoalkyl quat in the amount of from about 10% to about 90% by weight of the composition are provided. The subject compression devices include a base and a cover configured to apply a compression force to a structure comprising a first substrate separated from a second substrate by a separator when present in the device. 7 cm caused by a ram falling from a 76 cm height and a diameter of the whitened area of at most 1. The taper-roller bearing has an outer race contact angle of not less than 45 degrees between the rotation axis and the mutual contact of an outer race and tapered rollers. The structural description includes as outputs the identified intermediate signals. Several sections are then cut from the assembly, each of which can serve as a lid for an optical apparatus.