1. (a) “Acetate”: a manufactured fiber in which the fiber-forming substance is cellulose acetate. Where not less than 92% of the hydroxyl groups are acetylated, the term triacetate may be used as a generic description of the fiber.

2. (b) “Acrylic”: a manufactured fiber in which the fiber-forming substance is any long chain synthetic polymer composed of at least 85% by weight of acrylonitrile units

   

3. (c) “Azlon”: a manufactured fiber in which the fiber-forming substance is composed of any regenerated naturally occurring proteins.
4. (d) “Glass”: a manufactured fiber in which the fiber-forming substance is glass.
5. (e) “Metallic”: a manufactured fiber composed of metal, plastic-coated metal, metal coated plastic or a core completely covered by metal.

6. (f) “Modacrylic”: a manufactured fiber in which the fiber-forming substance is any long chain synthetic polymer composed of less than 85% but at least 35% by weight of acrylonitrile units

   

7. (g) “Nitrile”: a manufactured fiber containing at least 85% of a long chain polymer of vinylidene dinitrile (CH₂ -- C(CN)₂-) where the vinylidene dinitrile content is no less than every other unit in the polymer chain.

8. (h) “Nylon”: a manufactured fiber in which the fiber-forming substance is any long chain synthetic polyamide having recurring amide groups

   

   as any integral part of the polymer chain.

9. (i) “Olefin”: a manufactured fiber in which the fiber-forming substance in any long chain synthetic polymer composed of at least 85% by weight of ethylene, propylene or other olefin units.
10. (j) “Polyester”: a manufactured fiber in which the fiber-forming substance is any long chain synthetic polymer composed of at least 85% by weight of any ester of a dihydric alcohol and terephathalic acid (p-HOOC-C₆H₄-COOH-).
11. (k) “Rayon”: a manufactured fiber composed of regenerated cellulose, as well as manufactured fibers composed of regenerated cellulose in which substituents have replaced not more than 15% of the hydrogen of the hydroxyl groups.

12. (l) “Rubber”: a manufactured fiber in which the fiber-forming substance is comprised of natural or synthetic rubber, including the following categories:

    1. (1) A manufactured fiber in which the fiber-forming substance is a hydrocarbon such as natural rubber, polyisoprene, polybutadiene, copolymers of dienes and hydrocarbons, or amorphous (non-crystalline) polyolefins.

    2. (2) A manufactured fiber in which the fiber-forming substance is a copolymer of acrylonitrile and diene (such as butadiene) composed of not more than 50% but at least 10% by weight of acrylonitrile units

       

       The term “laetrile” may be used as a generic description for fibers falling within this category.

    3. (3) A manufactured fiber in which the fiber-forming substance is a polychloroprene or a copolymer of chloroprene in which at least 35% by weight of the fiber-forming substance is composed of chloroprene units

       

13. (m) “Saran”: a manufactured fiber in which the fiber-forming substance is any long chain synthetic polymer comprised of at least 80% by weight of vinylidene chloride units (-CH₂CCL₂-).
14. (n) “Spandex”: a manufactured fiber in which the fiber-forming substance is a long chain synthetic polymer composed of at least 85% of segmented polyurethane.
15. (o) “Vinyl”: a manufactured fiber in which the fiber-forming substance is any long chain synthetic polymer composed of at least 50% by weight of vinyl alcohol units (-CH₂-CHOH-), and in which the total of the vinyl alcohol units and any one or more of the various acetal units is at least 85% by weight of the fiber.
16. (p) “Vinyon”: a manufactured fiber in which the fiber-forming substance is any long chain synthetic polymer composed of at least 85% by weight of vinyl chloride units (-CH₂-CHCL-).

The following terms shall be stated on the law label when applicable in addition to other labeling nomenclature required by these regulations for defining the chemical composition of manufactured fibers.

Note: Authority cited: Sections 19034 and 19089, Business and Professions Code. Reference: Sections 19080, 19081, 19088, 19089 and 19150, Business and Professions Code.

History

1. Change without regulatory effect renumbering former section 1238 to new section 1143, including amendment of section heading and section, filed 5-19-2025 pursuant to section 100, title 1, California Code of Regulations (Register 2025, No. 21).