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- The Art and Science of FRP Manhole Covers
- The origins of the jackhammer can be traced back to the early 19th century, when it was first developed for use in mining operations. Its primary purpose was to break up hard rock and soil, allowing miners to extract valuable minerals more efficiently. Over time, the jackhammer has evolved significantly, with improvements in design and technology leading to increased power and versatility.
All these fittings are mady by hand lay-up process, with vinylester resin and E glass reinforcement materials.


“It is of great significance to establish a joint laboratory of composite materials with Sinochem International. The two sides will jointly promote technology development, results transformation and industrial application in related fields such as carbon fiber and solidified resins. We also will explore the collaborative innovation model of the technology joint research of a scientific research institute and an industrial group.”





tapered rock button drill bits.
