All products have certain inherent weaknesses dictated by the
product and it's intended use. Automobiles manufactured for use
in the northern climates must be resistant to road salt. House
paint must be resistant to sunlight, heat, cold, and humidity.
In each of these examples, the manufacturer of the product is
well aware of the threats to prolonged product lifetime. Having
this information, manufacturers seeking to provide a high level
of product reliability and product life will make every effort
to minimize the effects which the threat will have over the
expected product life. Over the past forty years, we have
developed an extensive working knowledge of optical coating and
optical assembly technology. During this time, we have conducted
comprehensive development programs to investigate and understand
the causes of product failure. As a result of these efforts, we
have made design improvements to eliminate premature product
failure and have developed families of products, supported by
substantiating data,