Properties of Ultra-fine Modified Precipitated Barium Sulfate for Matt Powder Coating

Technical Demand of Ultra-fine Modified Precipitated Barium Sulfate for Matt Powder Coating:
Item                                                      Quality Standard
(Barium Sulfate), %                            ≧   98
(Sulfide), %                                          ≦ 0.004
(Volatile at 105),%                              ≦   0.4
(Water-soluble) ,%                              ≦ 0.18
(Oil Absorption), g/100g                     ≦ 12--16
(Hardness),Mohs                                 3.5
Powder coating is a type of coating that is applied as a free-flowing, dry powder. The main difference between a conventional liquid paint and a powder coating is that the powder coating does not require a solvent to keep the binder and filler parts in a liquid suspension form. The coating is typically applied electrostatically and is then cured under heat to allow it to flow and form a "skin". The powder may be a thermoplastic or a thermoset polymer. It is usually used to create a hard finish that is tougher than conventional paint. Powder coating is mainly used for coating of metals, such as "whiteware," aluminium extrusions, and automobile and bicycle parts. Newer technologies allow other materials, such as MDF (medium-density fibreboard), to be powder coated using different methods.

Although soluble salts of barium are moderately toxic to humans, barium sulfate is nontoxic due to its insolubility. The most common means of inadvertent barium poisoning arises from the consumption of soluble barium salts mislabeled as BaSO4. In the Celobar incident (Brazil, 2003), nine patients died from improperly prepared radiocontrast agent.

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