In recent years, the scope of use of ultrafine talc powder has become increasingly widespread, so related manufacturers have begun to increase, and as a result, fake and shoddy products have gradually increased, so today Xiaobian classmates will tell you 3 ways to quickly identify microtalc powder.

Fine talcum powder can be dissolved in the soluble matter, take 5g talc powder and add 30ml water, boil for 30min, replenish the lost water at any time, let cool, filter residue and add 5ml water to wash and wash liquid and filtrate combined, evaporated to dryness, at 105 Dry at ℃ for 1h, the residue should not exceed 5mg; soluble matter in the acid: take 1g of talc, add 20ml of dilute hydrochloric acid, soak at 50 ℃ for 15min, filter and take 10ml of filtrate, add 1ml of dilute sulfuric acid, evaporate to dryness, and scorch until Constant weight, the residual residue should not exceed 7.5mg.

Fine talc powder in iron salt, take 10g of talc powder, add 30ml of water, heat and boil for 30min, replenish the lost water at any time, let cool and filter, add dilute hydrochloric acid and potassium ferrocyanide test solution to the filtrate 1ml, blue; soluble matter in acid: take 1g of talc, add 20ml of dilute hydrochloric acid, soak at 50 ℃ for 15min, filter and take 10ml of filtrate, add 1ml of dilute sulfuric acid, evaporate to dryness, and burn to constant weight, pay attention The residual residue shall not exceed 7.5mg.

Use pH: take 10g of talc powder, add 50ml of water, boil for 30min, mainly add the lost water in time, filter and add litmus paper to the filtrate, at this time it shows a neutral reaction.

Summarizing the three methods of identifying fine talcum powder mentioned above, do you remember? If you are interested in our products or have any questions, you can leave a message or contact us directly, we will contact you in time after receiving your information.