1、 Observation refers to observing the surface structure of stones with the naked eye. Generally speaking, stones with a uniform fine material structure have a delicate texture, making them excellent for stone materials; The appearance effect of stones with coarse and unequal grain structures is poor, and their mechanical and mechanical properties are also uneven, with slightly poor quality. In addition, due to the influence of geological processes, natural stone often produces some fine veins and micro cracks in it, which are prone to fracture along these parts, and attention should be paid to removing them. As for the lack of edges and corners, it is particularly important to pay attention when selecting.

二、量，即量石材的尺寸規格，以免影響拼接，或造成拼接后的圖案、花紋、線條變形，影響裝飾效果。

2、 "Quantity" refers to the measurement of the size and specification of the stone to avoid affecting the stitching or causing deformation of the patterns, patterns, and lines after the stitching, affecting the decorative effect.

三、聽，即聽石材的敲擊聲音。一般而言，質量好的，內部致密均勻且無顯微裂隙的石材，其敲擊聲清脆悅耳；相反，若石材內部存在顯微裂隙或細脈或因風化導致顆粒間接觸變松，則敲擊聲粗啞。

3、 Listening means listening to the knocking sound of stones. Generally speaking, stones with good quality, dense and uniform interior, and no micro cracks, have a clear and pleasant knocking sound; On the contrary, if there are micro cracks or fine veins in the interior of the stone or if the contact between particles becomes loose due to weathering, the knocking sound is rough and dumb.

四、試，即用簡單的試驗方法來檢驗石材質量好壞。通常在石材的背面滴上一小滴墨水，如墨水很快四處分散浸出，即表示石材內部顆粒較松或存在顯微裂隙，石材質量不好；反之，若墨水滴在原處不動，則說明石材致密質地很好。

4、 Trial, that is, using a simple test method to test the quality of stone materials. Usually, a small drop of ink is applied to the back of the stone. If the ink is quickly dispersed and leached, it indicates that the internal particles of the stone are loose or there are micro cracks, and the quality of the stone is poor; On the contrary, if the ink droplets remain in place, it indicates that the stone is dense and has a good texture.

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With the summary above from the elevator door cover manufacturer, I hope it can be helpful to our customers. If you have any questions or need help, please click on our website: http://www.jn0539.com Or call for consultation, and we will do our best to solve it for you