HS Code 40.05 – Compounded rubber, unvulcanised, in primary forms or in plates, sheets or strip

HS code 4005 is a 4-digit heading in the Harmonized System that covers: Compounded rubber, unvulcanised, in primary forms or in plates, sheets or strip. Heading 4005 covers compounded rubber, unvulcanized, in primary forms or in plates, sheets, or strip. This classification is critical for materials that are beyond the basic natural (4001) or synthetic (4002) rubber forms but have not yet undergone vulcanization. It encompasses rubber that has been mixed with various compounding ingredients such as carbon black, silica, oils, plasticizers, accelerators, activators, pigments, and anti-degradants, making it ready for the final shaping and curing process (vulcanization). The scope is focused on these prepared mixtures, often supplied in rolls, bales, sheets, or strips, specifically designed for specific applications like tire treads, seals, gaskets, or footwear components. It distinguishes itself from uncompounded rubbers (4001, 4002) by the presence of these additional ingredients and from reclaimed rubber (4003) by its origin (virgin or a specific blend) and formulation. For trade compliance, accurate classification under 4005 is essential because the specific formulation can significantly impact its end-use, potentially triggering different regulatory requirements, quality standards, and tariff rates. This heading serves as an intermediary stage in Chapter 40, bridging raw rubber materials and finished vulcanized articles, providing manufacturers with pre-prepared rubber compounds that save them in-house mixing costs and ensure consistent product quality.

Unvulcanized natural rubber compounds in sheets, unvulcanized synthetic rubber compounds in strips, pre-mixed tire tread compounds, colored rubber compounds for footwear, medical-grade rubber compounds in rolls, EPDM compounds for weatherstrips, NBR compounds for O-rings, silicone rubber compounds for molding, butyl rubber compounds for sealants, SBR compounds for belting, fluorocarbon rubber compounds, flame-retardant rubber compounds, electrically conductive rubber compounds, rubber masterbatches (compounded but unvulcanized), unvulcanized rubber calendered sheets, abrasion-resistant rubber compounds, oil-resistant rubber compounds, heat-resistant rubber compounds, food-grade rubber compounds, sound-damping rubber compounds, UV-stabilized rubber compounds, chemical-resistant rubber compounds, low-temperature rubber compounds.

A common misclassification for 4005 is confusing it with uncompounded natural (4001) or synthetic (4002) rubber; the key distinction is the presence of compounding ingredients beyond basic polymers. Traders also frequently confuse it with vulcanized rubber (later headings in Chapter 40) because it might look like a finished product, but 4005 explicitly covers *unvulcanized* forms. Lastly, unvulcanized rubber that is already in forms other than primary (e.g., rods, tubes, discs, rings) should be classified under 4006, not 4005, which is limited to primary forms, plates, sheets, or strip.

In 2025, the top exporters of HS code 4005 in UN Comtrade data were Germany ($1.2B, 17% of world exports), the United States ($776M) and Italy ($604M). World exports came to about $7.0B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

In 2025, the top importers of HS code 4005 in UN Comtrade data were India ($662M, 9.5% of world imports), the United States ($646M) and Germany ($545M). World imports came to about $7.0B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

HS code 4005 is a 4-digit heading under Chapter 40 of the Harmonized System. The first 2 digits (40) identify the chapter, and digits 3-4 (05) specify the heading. This code contains multiple 6-digit subheadings for precise product classification.