MXIK (IKPU) codes, class 03811: Anti-knock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers, anti-corrosive preparations and other prepared additives for mineral oils (including gasoline) or other liquids
1 position · 3 subpositions · 57 codes · tasnif.soliq.uz, data as of 14.10.2026
Updated:
In the MXIK (IKPU) classifier, class 03811 "Anti-knock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers, anti-corrosive preparations and other prepared additives for mineral oils (including gasoline) or other liquids" is part of group 038 "Miscellaneous chemical products". As of 14.10.2026 it has 1 position and 3 subpositions carrying 57 codes in total. That is 1.3% of all codes in the group.
All subpositions of the class sit in a single position, 03811001 "Anti-knock preparations, oxidation inhibitors, gum inhibitors, viscosity…". The largest subpositions are "Antioxidants, inhibitors, viscosity improvers (all kinds)" (03811001001, 45), "Anti-knock preparations (all kinds)" (03811001006, 11). Other examples: "Additives for lubricating oils".
By number of codes the class ranks 6th of 27 in the group. Neighbouring classes: 03810 "Pickling preparations for metal surfaces; soldering, brazing or…" (1 code) and 03812 "Prepared rubber accelerators; compound plasticisers, anti-oxidising…" (2 codes). Under the coding scheme in the Regulation on the National Catalogue, digits 2 to 5 of a goods code are the customs (TN VED, HS-based) code; for this class it is 3811.
Codes in this class
| Code | Name | Copy code |
|---|---|---|
| 03811001 | Anti-knock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers, anti-corrosive preparations and other prepared additives for mineral oils (including gasoline) or other liquids57 codes | |
| 03811001001 | Antioxidants, inhibitors, viscosity improvers (all kinds)45 codes | |
| 03811001006 | Anti-knock preparations (all kinds)11 codes | |
| 03811001014 | Additives for lubricating oils1 code |
How to apply an MXIK code
- Find the subposition of your good or service: the first 11 digits are the group, class, position and subposition.
- Pick the 17-digit code on tasnif.soliq.uz: the last 6 digits are brand and attribute; goods without a barcode use "000000".
- Show this code in electronic invoices (ESF) and online cash register receipts, and for imports in the customs cargo declaration.
- Watch for changes on tasnif.soliq.uz: deleting or changing a code takes effect after 30 days.
- No suitable code? Send a request to the operator through your personal account (reviewed within 3 working days).
Help with MXIK codes in accounting and e-invoices
Leader Audit accountants can match MXIK codes to your product list, review invoices and receipts and set up your accounting in line with the code rules.
Accounting servicesOther classes in this group
- 03808 — Insecticides, rodenticides, fungicides, herbicides, anti-sprouting products and plant-growth regulators, disinfectants and similar products
- 03814 — Organic composite solvents and thinners; prepared paint or varnish removers
- 03816 — Refractory cements, mortars, concretes and similar compositions
- 03820 — Anti-freezing preparations and prepared de-icing fluids
- 03822 — Diagnostic or laboratory reagents; certified reference materials
- 03824 — Prepared binders for foundry moulds or cores; chemical products and preparations of the chemical or allied industries
Frequently asked questions
What is the MXIK (IKPU) code for "Antioxidants, inhibitors, viscosity improvers (all kinds)"?
The subposition "Antioxidants, inhibitors, viscosity improvers (all kinds)" has code 03811001001: group 038, class 03811, position 03811001 "Anti-knock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers, anti-corrosive preparations and other prepared additives for mineral oils (including gasoline) or other liquids". It covers 45 codes: all of them start with these 11 digits, and the last 6 digits stand for brand and attribute. The exact 17-digit code is chosen on tasnif.soliq.uz.
What is the MXIK (IKPU) code for "Additives for lubricating oils"?
The subposition "Additives for lubricating oils" has code 03811001014: group 038, class 03811, position 03811001 "Anti-knock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers, anti-corrosive preparations and other prepared additives for mineral oils (including gasoline) or other liquids". It covers one 17-digit MXIK code starting with these 11 digits. The exact 17-digit code is chosen on tasnif.soliq.uz.
How many MXIK codes are in class 03811?
As of 14.10.2026, class 03811 "Anti-knock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers, anti-corrosive preparations and other prepared additives for mineral oils (including gasoline) or other liquids" has 1 position, 3 subpositions and 57 codes. Every code in the class starts with 03811.
How does class 03811 differ from class 03812?
They are neighbouring classes of group 038. Class 03811 "Anti-knock preparations, oxidation inhibitors, gum inhibitors, viscosity…" has 1 position and 57 codes; class 03812 "Prepared rubber accelerators; compound plasticisers, anti-oxidising…" has 1 position and 2 codes. The class is digits 4–5 of the MXIK code, so a wrong class changes the base code of the item.
What if there is no suitable MXIK code?
According to the official tasnif.soliq.uz FAQ, codes are searched by subposition name, brand, barcode or the first 4 digits of the customs (TN VED) code, via the site questionnaire or in the Excel export of the database. If nothing fits, a request is sent to the catalogue operator through the personal account; it is reviewed within 3 working days.
Sources
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