--- title: "3811 – Anti-knock preparations, oxidation…: Canada tariff & duty rates" description: "Every Canadian tariff classification under HS 3811: Anti-knock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers, anti-corrosive…" canonical: "https://www.adhocs.ca/hs-codes/3811" --- # 3811 Anti-knock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers, anti-corrosive preparations and other prepared additives, for mineral oils (including gasoline) or for other liquids used for the same purposes as mineral oils. Up: [HS codes](https://www.adhocs.ca/hs-codes) › [Chapter 38](https://www.adhocs.ca/hs-codes/38) 5 subheadings. Each subheading links to its page, which lists its 10-digit codes, or to its only 10-digit code. ## Anti-knock preparations - [3811.11.00.00](https://www.adhocs.ca/hs-codes/3811.11.00.00) Based on lead compounds - [3811.19.00.00](https://www.adhocs.ca/hs-codes/3811.19.00.00) Other ## Additives for lubricating oils - [3811.21](https://www.adhocs.ca/hs-codes/3811.21) Containing petroleum oils or oils obtained from bituminous minerals - [3811.29.00.00](https://www.adhocs.ca/hs-codes/3811.29.00.00) Other - [3811.90](https://www.adhocs.ca/hs-codes/3811.90) Other ## Other headings in this chapter - Previous: [3810](https://www.adhocs.ca/hs-codes/3810) Pickling preparations for metal surfaces; fluxes and other auxiliary preparations for soldering, brazing or welding; soldering, brazing or welding powders and pastes consisting of metal and other materials; preparations of a kind used as cores or coatings for welding electrodes or rods. - Next: [3812](https://www.adhocs.ca/hs-codes/3812) Prepared rubber accelerators; compound plasticizers for rubber or plastics, not elsewhere specified or included; anti-oxidizing preparations and other compound stabilizers for rubber or plastics. [Source: CBSA Customs Tariff](https://www.cbsa-asfc.gc.ca/trade-commerce/tariff-tarif/menu-eng.html).