These Charts show the thermal deformation temperature and the softening temperature (called the âVicat softening temperatureâ) of major plastics. The heat distortion temperature is the temperature when the test piece placed in the heat medium with bending load applied reaches a specified deflection as temperature rises. The Vicat softening temperature is defined as the temperature where the needle shaped penetrator sinks into the test piece to a specified depth as temperature of the heating medium rises and specified vertical load is applied to the test piece.
Puerto Rico is a territory (Commonwealth) of the United States of America and Puerto Ricans have common citizenship, currency and defense. Although Puerto Ricans are U.S. citizens, residents of Puerto Rico pay no federal income tax, nor can they vote in presidential elections.
Puerto Rico's Unique Mix of Languages. Over the centuries different languages have been introduced to the Puerto Rican culture for a variety of reasons. Before the island experienced any significant changes in terms of culture and languages, the island's population was made up entirely of aboriginal people. This changed in 1493 the Spanish took over Puerto Rico, followed by Columbus who was on his second voyage to the area.