 Because of the large differences in test regimes all over the world, even for "identical products and systems", organizations that intend to market their products internationally are often required to run many tests in many countries.Even where test regimes are identical, countries are often reluctant to accept the test results and particularly the certification methods of other countries.During a fire in a tunnel, as well as in the petrochemical industry, temperatures exceed those of ordinary building (cellulosic) fires.