What are the methods to distinguish the quality of gypsum powder from its appearance? The following is introduced by the professional staff of Jinan gypsum powder:

　　通過外觀上觀察和手感可初步判斷石膏粉質(zhì)量的優(yōu)劣。觀察就是看外觀包裝袋質(zhì)量情況和石膏粉的外觀顏 色，手感就是用手搓一搓石膏粉的糙細(xì)程度(細(xì)度)。

　　The quality of gypsum powder can be preliminarily judged by its appearance observation and feel. Observation is to see the quality of the external packaging bags and the appearance of the color of gypsum powder, feel is to rub the roughness (fineness) of gypsum powder by hand.

　　(1)若包裝塑料編織袋的材質(zhì)質(zhì)量差、松軟強(qiáng)度低、 做工粗糙、編織稀疏(單位面積內(nèi)的經(jīng)緯數(shù)目不達(dá)標(biāo))、顏 色發(fā)灰綠黑色、內(nèi)部沒有防潮塑料袋、出現(xiàn)撒料現(xiàn)象、三 無產(chǎn)品或外觀標(biāo)識(shí)(種類名稱、生產(chǎn)廠家、商標(biāo)、重量、聯(lián) 系方式等)不齊全的石膏粉則很大可能不符合質(zhì)量標(biāo)準(zhǔn)、 檔次質(zhì)量差，質(zhì)量穩(wěn)定性也不能保證。反之，那些包裝塑 料編織袋用材好、做工精致、顏色發(fā)白、強(qiáng)度高、編織經(jīng)緯 密集、內(nèi)部有防潮塑料袋、封口嚴(yán)密、外觀印刷清晰、標(biāo)識(shí) 齊全、不撒料的石膏粉一般質(zhì)量較好、檔次高，質(zhì)量有保證。一般使用這種包裝袋的石裔粉白度高、細(xì)度細(xì)。若石 膏粉是質(zhì)量上乘的、高附加值的高強(qiáng)度石膏粉、特種 石膏粉(如母模石裔粉、原模石膏粉或樹脂石膏粉)，其價(jià) 格很高,是普通石膏粉的3～9倍。

　　(1) If the material quality of plastic woven bags is poor, the soft strength is low, the workmanship is rough, the knitting is sparse (the number of longitudes and wefts per unit area is not up to the standard), the color is greyish green and black, there is no moisture-proof plastic bags inside, there is no spraying phenomenon, and there is no product or appearance marking (category name, manufacturer, trademark, weight, contact mode, etc.) incomplete plaster powder may be very large. It meets the quality standard and the quality of grade is poor, and the quality stability can not be guaranteed. On the contrary, those packaging plastic woven bags have good materials, exquisite workmanship, white color, high strength, dense weaving warp and weft, moisture-proof plastic bags inside, tight seals, clear appearance, complete markings, and no spraying of gypsum powder are generally of good quality, high grade and guaranteed quality. Generally, this kind of packing bag has high whiteness and fine fineness. If gypsum powder is of high quality and high added value, high strength gypsum powder and special gypsum powder (such as mother model gypsum powder, prototype gypsum powder or resin gypsum powder), its price is high, which is 3-9 times higher than that of ordinary gypsum powder.

　　(2)外觀上看，白度高的石膏粉細(xì)度目數(shù)高，質(zhì)量 好，價(jià)格較高;而發(fā)灰發(fā)黑、里面有黑色雜質(zhì)的石膏粉質(zhì) 量較差。用手的拇指和食指搓捻石膏粉,手感發(fā)沙粗糙的 石膏粉細(xì)度糙，質(zhì)量較差、價(jià)格較低;而手感細(xì)膩的石音 粉說明細(xì)度細(xì)，質(zhì)量較好，價(jià)格也會(huì)較高。

　　(2) Apparently, gypsum powder with high whiteness has high fineness, good quality and high price, while gypsum powder with gray and black impurities is of poor quality. Twisting gypsum powder with the thumb and forefinger of the hand, the gypsum powder with rough feel of sofa is coarse in fineness, poor in quality and low in price; while the stone tone powder with fine feel is fine in fineness, good in quality and high in price.

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