Tongtu" high grade road asphalt (AH-130,AH-110,AH-90,Ah-70) and general grade road asphalt (140#, 100#A) produced by our company passed the conformity of product quality, the enterprise passed the conformity of ISO9002 quality system. The product quality reaches the advanced level in the world.
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Tongtu" high grade road asphalt (AH-130,AH-110,AH-90,Ah-70) and general grade road asphalt (140#, 100#A) produced by our company passed the conformity of product quality, the enterprise passed the conformity of ISO9002 quality system. The product quality reaches the advanced level in the world.