Some information on Polyamides:
Nylon 6: Good resistance to abrasion and most chemicals, even at high temperatures. Excellent recovery. Immune to corrosion and resistant to aqueous solutions of salts and alkalis. The most economical of the polyamide yarns, it is used for brushes where no wet work is done such as clothes brushes.
Nylon 66: has lower water absorption and higher elasticity, used for head brushes and very economical hygienic brushes.
Nylon 6.12: specially used for toothbrushes and cosmetic brushes and where a particularly thin diameter below 0.10 mm is required. High flexibility and heat resistance.
Polyester Hollow-section, with an apparent weight 30-40% lighter than other full-section synthetic fibres. Especially used for brooms and brushes
Polypropylene Easy to process, with good chemical resistance, low density, high stiffness, abrasion and heat resistance is available in types N - for normal processing (household brushes, paintbrushes and vacuum cleaner brushes; H - super-stabilised (where high strength and flexibility are required)
For example, toothbrushes is also used:
Nylon 66 transparent white: colour 906
Nylon 66 milk white: colour 901
Nylon 612 transparent white: colour 900
Nylon 612 milk white: colour 901
In some high-quality brushes, Nylon 612 is used, and in medium quality Nylon 66.
In some cases, but nowadays rarely, bleached bristles are also used.
Badger's hair is also required for particularly soft brushes.
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