Polypropylene also includes a copolymer of propylene and a small amount of ethylene. It's the lightest general-purpose plastic. Corrosion resistance, tensile strength 30MPa, strength, rigidity and transparency are better than polyethylene. The disadvantage is poor impact resistance at low temperature and easy aging, but can be overcome by modification and addition of antioxidant. Brittle temperature - 35 ℃, 35 ℃ below - will happen embrittlement, cold tolerance than polyethylene. The chemical stability of polypropylene is very good, except can be eroded by concentrated sulfuric acid and concentrated nitric acid, it is stable to all kinds of chemical reagents.

Recycling of plastic waste plastics is one of the, in civil, industrial and other USES, used and ultimately eliminate or replace down and after cleaning and crushing of discarded products of plastic called recycled plastics. Our black core box USES recycled plastic.

Injection molding: melt the plastic into the plastic product mold by pressure, cooling and forming to get the desired plastic parts. There is a special machine for injection molding. The advantage is that the production speed is fast, the efficiency is high, the operation may realize the automation, the size may from big to small, the product size is accurate. With high surface precision, the same batch of shape error is minimal.

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   ShangDong Geological&Mineral Equipment Ltd Corp was established in 1992 which consists of sales department,processing plant,international trade department, new product R&D and storage department. We are a spirited state-owned company.

 our company is located in East of Jinan city, capital of ShanDong Province, 30000 square meters area. Storage warehouse exceeds 10000 square meters.Our registered capital is 6.89 million RMB, and we have more than 80 staff in which about 1/2 are medium and high engineers. Professional sales manager, product manager and after-sales team are available for you at any time.

 “DI BIAO” is our patent brand for new designed core box. Different from old type, new  series core box is designed as per international standard and made of PE&PP through a special proportion which enhance each index and increase its life a lot. Until now, our products are exported to Europe, Middle Asia, Southeast Asia, Africa and South America, several countries. We win trust and reputation from our dear client and friend.

    “CREATING VALUE FOR CLIENT FOR EVER”is our business principle; “ACCOMPLISH YOU AND ME”is our pursuit. We can grow up all the way only if client can benifit from the cooperation with us.