UVCB substances

UVCB substances are substances of unknown or variable composition, complex reaction products, and biological materials that cannot be represented by unique structures and molecular formulas. Some UVCB substances are not adequately described by their CA Names and have supplemental definitions that are considered integral parts of the names for TSCA purposes. The guidance, entitled Toxic Substances Control Act Inventory Representation For Chemical Substances Of Unknown Or Variable Composition, Complex Reaction Products And Biological Materials UVCB Substances points out that any substance that matches a CA Name but is not covered by the substance description is not considered to be covered by that Inventory listing. [Pg.86]

Available at Jittp //www.epa.gov/oppt/newcJiems/pubs/uvcb.txt. [Pg.86]

EPA gives several illustrations of nomenclature for substances of variable composition, including [Pg.87]

The UVCB definition for this substance is An inorganic pigment that is the reaction product of high temperature calcination in which neodymium (III) [Pg.87]

A dagger(t) is found next to the CASRN in the printed TSCA Inventory to indicate that a definition exists for that chemical substance. These definitions appear in Appendix A of volume 1 of the 1985 Edition of the TSCA Chemical Substances Inventory. Persons using various online versions need to be certain that they obtain any definitions that may pertain to UVCB substances of interest before they make Inventory determinations. The definitions are usually found in fields separate from the main CA names, and so may be overlooked. UVCB Substances. 3.UVCB Substances, IID. [Pg.87]

Mum oil is a UVCB substance which cannot be sufficiently identified by its chemical composition, as discussed in Chapter... [Pg.64]

Id. This guidance contains certain exceptions to this general rule, no. UVCB Substances, II A. [Pg.32]

Toxic Substances Control Act Inventory Representation For Chemical Substances Of Unknown Or Variable Composition, Complex Reaction Products And Biological Materials UVCB Substances UVCB Substances... [Pg.665]

Products And Biological Materials UVCB Substances UVCB... [Pg.667]

Using the CAS number system to also register UVCB substances in EINECS, that is, products that are not defined chemicals, it made it necessary to extend the CAS system also to the so-called UVCBs. Essential oils as NCS eventually are registered by their botanical origin. As, for example,... [Pg.1044]

The TSCA Inventory provides an overall picmre of the organic, inorganic, polymers, and UVCB (chemical substances of Unknown, or Variable Composition, Complex Reaction Products, and Biological Materials) chemicals produced, processed, or imported for commercial purposes in the United States. The Inventory is not a list of chemicals based on toxic or hazardous characteristics, since toxicity/hazard is not a criterion for inclusion in the list. The Inventory includes chemical substances of any commercial use in the United States since 1979 under the Environmental Protection Act, and is prepared by the US-EPA. The current TSCA Inventory contains approximately 81,600 chemicals. Currently, OPPT is focusing on a subset of approximately 3,000 HPV... [Pg.23]

UVCB Chemical Substances of Unknown, or Variable Composition, Complex... [Pg.450]

Poorly defined substances or of variable composition are defined as UVCB. This designation is comparable with the UVCB category in the US under the Toxic substances Control Act (TSCA). Substances included in this grouping cannot be identified by chemical... [Pg.62]

The TGD identifies four subtypes of UVCB chemicals (1) where the source is biological and the process is a synthesis (2) where the source is a chemical or mineral and the process is a synthesis (3) where the source is biological and the process is refinement and (4) where the source is chemical or mineral and the process is a refinement. One very common and simple example of these parameters is if two very well-defined chemicals react with each other, but the chemical identity of the reaction product is not sufficiently known or is poorly predictable. For example, reaction of the dicarboxylic acid nonanedioic acid with 2-amino-2-methyl-l-propanol, a substance with alcohol and amine functionality, can produce multiple products. The amine can reacts with either acid group or both to form amides, the alcohol can react with either acid group or both to form esters, or a combined ester-acid may form. The preferred EINECS name for registration purposes is nonanedioic acid, reaction products with 2-amino-2-methyl-l-propanol, EC number 294-006-2 CASRN 91672-02-5. [Pg.63]

The UVCB definition for this substance is A complex combination of hydrocarbons separated as a liquid from natural gas in a gas recycling plant by processes such as refrigeration or absorption. It consists mainly of saturated aliphatic hydrocarbons having carbon munbers in the range of C2 through C8. This substance includes variable carbon chain lengths. ... [Pg.88]

Substances that are either biological materials or made from biological materials may be listed as UVCB products on the Inventory if they are not natural products. Natural products do not have to be listed on the Inventory. Natural products are those that occur in nature and are either unprocessed or processed only by manual, mechanical, or gravitational means by dissolution in water by flotation or by heating solely to remove water or which is extracted from air by any means. EPA gives beeswax CAS Number 12-89-3 as an example of a product that is not natural and explains ... [Pg.88]

The UVCB definition for this substance is The wax obtained from the honeycomb of the bee. It consists primarily of myricyl palmitate, cerotic acid and esters and some high-carbon paraffins. Although the method of isolation or purification is not stated in the definition, the listing assumes that other than mechanical means were used this substance is not a natural product for purposes of TSCA. ... [Pg.88]

To perform this task, the EU administration—as the United States already did many years ago— made use of the principles of the CAS system and arranged for the majority of essential oils and other UVCB (chemical substances of unknown or variable composition, complex reaction products and biological materials) and allocated (new) more precise CAS numbers, which were eventually also published in EINECS. [Pg.1043]

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