The parts and the chemical ingredients for purification of Douai are all sourced from suppliers who have qualification and certifications in supplying quality water treating materials.
Douai undergoes a series of production methods such as sanding, painting, and ovendry. All these methods are strictly carried out by our professional workers.
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The production procedures of Douai include shaping, firing, glazing, and re-firing. All of these workmanships are done by skilfully technicians who have many years of experiences in porcelain.
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The raw materials of Douai are guaranteed safe and non-toxic. The materials have been tested to free of toxic ingredients, such as formaldehyde and aromatic amines.
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Douai has passed the FCC, CE and ROHS safety certification, which is regarded as an internationally qualified product.
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The quality control procedures of Douai [拓展关键词 starts from the receipt of raw material, over the precursor chemicals, up to the final cathode active material.
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The product is rigorously examined under the supervision of skilled quality experts.