2917.33.00 - Dinonyl or didecyl orthophthalates

HTS code 2917.33.00 specifically classifies dinonyl or didecyl orthophthalates. These are diesters of orthophthalic acid, characterized by the presence of either nine-carbon (nonyl) or ten-carbon (decyl) alkyl chains esterified to the carboxylic acid groups of the phthalic acid molecule. Such compounds are typically employed as plasticizers in polymers, imparting flexibility and durability.

This category is distinct from its siblings by the specific length of the alcohol chains involved in the esterification. For instance, HTS code 2917.32.00.00 covers dioctyl orthophthalates, which feature eight-carbon alkyl chains. Similarly, other sibling categories address different phthalic acid derivatives like phthalic anhydride (2917.35.00.00) or terephthalic acid (2917.36.00.00), which are not orthophthalate esters.

The subcategories under 2917.33.00.00 provide further granularity. 2917.33.00.10 specifies diisodecyl orthophthalate, a particular isomer of didecyl orthophthalate. The residual "Other" category, 2917.33.00.50, captures any remaining dinonyl or didecyl orthophthalates not otherwise specified, ensuring comprehensive coverage within this classification.