How to distinguish true and false pineapple

First of all, the pineapple grid is just a non-standard scientific name, divided into Indonesian pineapple grid, African pineapple grid, Burmese pineapple grid according to different origins. For a penny, the identification of a pineapple can only identify a particular pineapple, such as the Indonesian pineapple. The method of distinguishing Indonesian pineapple grid is that in the middle of wood grain, there will be small dots of yellow color, commonly known as gold wire. If you have the conditions, you can cut the floor and see if there is a gold thread in the cross section. The gold thread is really the Indonesian pineapple grid.

Secondly, you can ask for a certificate of origin when you choose Indonesian pineapple. The certificate of origin is the only valid document that can prove the authenticity of the pineapple.

PP plastic, also known as polypropylene plastic, is another fine resin varieties, following the development of nylon, which is a semi-crystalline materials, the advantage is obvious, with excellent mechanical properties and heat resistance, with a high not hydrophilic sex, almost non-absorbent. The disadvantage is poor low temperature impact resistance, easier to aging. However, for comparison PE plastic having a higher melting point.

PE plastic is polyethylene plastic, its corrosion resistance and electrical insulation are very strong. Rigid hardness and strength are relatively high, and the same PP plastic, it also very small water absorption.

Polycarbonate (referred PC) is a polymer molecular chain containing a carbonate group, an ester group according to the structure can be divided into aliphatic, aromatic, aliphatic - aromatic and other types. Which due to the aliphatic and aliphatic - aromatic polycarbonate lower mechanical properties, thereby limiting its application in engineering terms. Currently, only the aromatic polycarbonate obtained industrial production. Due to the special nature of the polycarbonate structure, it has now become the top five fastest growing engineering plastics in general engineering plastics.

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