And as a building material is different from the 15th century Inca empire in Central and South America, people asphalt used for medicinal purposes. March 22, 1595 Low pitch, Walter Raleigh in the adventure on the way to Trinidad found a natural asphalt lake. Even today people are still emerge from the ground in this own asphalt road construction. China bitumen market is still in short supply, especially those high-end asphalt market in China is to be excavated talented people and many of the ordinary road asphalt manufacturers, but less professional asphalt manufacturer, we should and gradually improve the professional asphalt manufacturers to make up the growing market demand of professional asphalt. In the following years, a variety of application is extended to seal asphalt roof waterproofing layer. At the time, reinforced with asphalt pavement is still expensive that only the rich can use private road asphalt reinforcement surface. Asphalt was first used on the bridge as an asphalt pavement is mounted on a wooden bridge in Sunderland. In the early 20th century, along with engineering material prices continue to decline asphalt stock, asphalt show more sense. In 1907, the first asphalt members in the United States put into use. 1914 asphalt nature, in order to get a better index of refraction, people in Berlin for the first time to see the racing lane asphalt pavement, asphalt Shandong Chemical _ _ three flat pitch provided by the Jinan Chemical Co., Ltd. three levels. Jinan three ping Chemical Co. (www.sanpinghuagong.com) quality of service and products, continue to receive the recognition and trust of new and old customers and the industry. Our company is a certified member of the whole alliance network operators, business alliance customer service icon on the page, you can talk directly with our customer service staff, to our future cooperation happy!