Code 2528 00 · Heading 2528

Natural borates, concentrates or natural boric acids with ≤ 85% H3BO3, excluding borates from natural brines

This covers natural borates and their concentrates, including calcined products, as well as natural boric acids. The product must contain ≤ 85% H3BO3 calculated on the dry-substance basis, and borates extracted from naturally occurring brines are excluded.

For example

Natural borate containing ≤ 85% H3BO3 calculated on the dry-substance basis
Natural borate concentrate containing ≤ 85% H3BO3 calculated on the dry-substance basis
Calcined natural borate containing ≤ 85% H3BO3 calculated on the dry-substance basis
Natural boric acid containing ≤ 85% H3BO3 calculated on the dry-substance basis

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See the official tariff text

Official tariff text

Borates, natural, and concentrates thereof, whether or not calcined, and natural boric acids containing <= 85% of H3BO3 calculated on the dry weight (excl. borates separated from natural brine)

The path to this code

Every code is reached through these choices, one level at a time.

Step 4 of 4

Step 1 · Section V Mineral products
Is the product salt, sulphur, earth or stone, gypsum, lime or cement; an ore, slag or ash; or a mineral fuel, mineral oil, distillation product, bituminous substance or mineral wax?
✓
Step 2 · Chapter 25 Salt; sulphur; earths and stone; plastering materia… 1 of 3 chapters in section V
Which named material or product type is it: salt, natural iron sulphides, sulphur, natural graphite, natural sand, quartz or quartzite, kaolin or other kaolin-containing clay, other clay or related materials, chalk, natural phosphates, natural barium compounds, fossil siliceous meal or similar earth, pumice or other natural abrasives, slate, marble or other dense building limestone, granite or other building stone, gravel or crushed stone, dolomite, magnesite or magnesium oxide, gypsum, limestone for lime, cement, asbestos, mica, steatite or talc, natural borates or boric acids, feldspar or similar minerals, or vermiculite, perlite and other minerals?
✓
Step 3 · Heading 2528 Borater, naturlige, og koncentrater deraf, også bræ… 27 of 29 headings under chapter 25
Is it a natural borate or concentrate, including a calcined product, or natural boric acid containing <= 85% H3BO3 on a dry-substance basis, and is it not a borate extracted from naturally occurring brines?
✓
Step 4 · Subheading 2528 00 Borates, natural, and concentrates thereof, whether… 1 of 1 subheading under heading 2528
Is the product a natural borate, a concentrate of natural borate, including a calcined product, or a natural boric acid containing ≤ 85% H3BO3 calculated on the dry-substance basis, and is it not a borate extracted from a naturally occurring brine?

Full 8-digit codes

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1 code below this one

2528 00 00 Borates, natural, and concentrates thereof, whether or not calcined, and natural boric acids containing <= 85% of H3BO3 calculated on the dry weight (excl. borates separated from natural brine) Duty free Save

Export to Norway

What Norwegian customs charges when goods like these are imported into Norway.

25.28.0000

Natural borates and concentrates thereof (whether or not calcined), but not including borates separated from natural brine; natural boric acid containing not more than 85 % of H3BO3, calculated on the dry weight.

Ordinary duty

Duty free

Goods of EU origin

Duty free You need documentation of EU origin to use this rate.

Norwegian tariff data version 1.5/1.2, last checked Aug. 9, 2026.

Contains data from Norwegian Customs (data.toll.no), licensed under CC BY 4.0, adapted for display.

Export to the United Kingdom

What UK customs charges when goods like these are imported into the UK.

2528 00 00 00

Natural borates and concentrates thereof (whether or not calcined), but not including borates separated from natural brine; natural boric acid containing not more than 85 % of H<sub>3</sub>BO<sub>3</sub> calculated on the dry weight

Ordinary duty

Duty free

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.

These rates apply in Great Britain. Different rules may apply for goods entering Northern Ireland.

UK tariff data version v4.0.1576, last checked Aug. 9, 2026.

Contains public sector information licensed under the Open Government Licence v3.0.

Source: UK Department for Business and Trade (data.api.trade.gov.uk).

Duty rates shown here are estimates, read from official EU / Danish, Norwegian and UK tariff data for orientation only. Confirm the current rate with SKAT, TARIC, Norwegian Customs or the UK Online Trade Tariff before you file. The rate you pay can also depend on the country of origin. These are base customs duties only: import VAT, excise duties, anti-dumping duties and safeguard or quota measures are not included.