Pure Zinc Oxide Powder

Pure Zinc Oxide Powder

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The pure zinc oxide powder produced is mainly 99.7% content, commonly known as 997 (99.7) zinc oxide.

Inspection method of various indexes of pure zinc oxide powder:

*Alkalinity of pure zinc oxide powder: take 1.0g of this product, add 10ml of freshly boiled hot water, shake for 5 minutes, let cool, filter, add 2 drops of phenolphthalein indicator solution to the filtrate, if it appears pink, add hydrochloric acid titrant (0.1mol/l) 0.10ml, the pink color should disappear.

*Pure zinc oxide powder carbonate and insoluble matter in acid: Take 2.0g of this product, add 10ml of water and mix, add 30ml of dilute sulfuric acid and heat on a water bath without bubbles; after stirring, the solution should be clear.

*Weight loss on ignition of pure zinc oxide powder: Take about 1.0g of the product, accurately weigh it, and ignite it to constant weight at 800℃, and the weight loss shall not exceed 1.0%.

*Pure zinc oxide powder iron salt: take 0.40g of this product, add 8ml of dilute hydrochloric acid, 15ml of water and 2 drops of nitric acid, boil for 5 minutes to dissolve, let cool, add water to make 50ml, after mixing, take out 25ml, add 10ml of water , According to inspection, compared with the control solution made of 1.0ml standard iron solution, it should not be deeper (0.005%).

*Pure zinc oxide powder lead salt: Take 2.0g of this product, add 20ml of water and stir well, add 5ml of glacial acetic acid, put it on a water bath and heat to dissolve, let it cool, filter, and add 5 drops of potassium chromate indicator solution to the filtrate. turbid.

*Pure zinc oxide powder arsenic salt: Take 1.0g of this product, add 5ml of hydrochloric acid and 23ml of water to dissolve it, check according to law, and meet the regulations (0.0002%)

Standard:《GB/T3185-2016》

Determination of pure zinc oxide powder content：

Take about 0.1g of pure zinc oxide powder, accurately weigh it, add 2ml of dilute hydrochloric acid to dissolve it, add 25ml of water, add 1 drop of 0.025% methyl red ethanol solution, drop the ammonia test solution until the solution is slightly yellow, add 25ml of water and ammonia -10ml of ammonium oxide buffer (ph10.0) and a little chrome black t indicator, titrate with disodium ethylenediaminetetraacetate titrant (0.05mol/l) until the solution turns from purple to pure blue. Each 1ml of ethylenediaminetetraacetate disodium titrant (0.05mol/l) is equivalent to 4.069mg of zno.

MST high purity zinc oxide is your best choice.