TariffsChart
Source-backed base HTS2528.00.00

HTS 2528.00.00 Duty Rate: Free

Description: 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 percent of H3BO3 calculated on the dry weight

Verified source

Base HTS fields include an official source, retrieval date, and calculation trace. This page still remains a planning and broker-review prep page.

US import duty quick answer

HS 2528.00.00 (Natural borates and concentrates thereof (whether or not calcined...) has a source-backed MFN base rate of Free. For China-origin shipments, Section 301, Section 122, Section 232, AD/CVD, and exclusions must be reviewed as separate layers; this page does not present unsupported layers as a final filing rate.

HTS code

2528.00.00

Base MFN rate

Free

Planning view

Base Free + review layers

Use this HTS code in the landed cost calculatorGet a $29 expert quick check

China-origin duty stack

MFN base duty

Free

From the USITC HTS general/base duty field.

Section 301 / Chapter 99

Review required

This page does not have enough public source evidence to publish this layer. Review USTR lists, Chapter 99 instructions, and exclusions separately.

Section 122 / temporary baseline

Current-status review

Temporary or litigated tariff layers should be verified against current Federal Register, CBP, and broker guidance before they are added to the base rate.

Section 232 / product-specific remedies

Product review

Section 232 is not a default layer outside sensitive products such as steel, aluminum, copper, autos, and lumber, but product and Chapter 99 review still matter.

China-origin planning view

Base Free + review layers

Treat this as a public composite only when every component has a complete source chain.

Use in calculatorSave source snapshotGenerate broker review packetOpen official source

What is this HS code?

HS 2528.00.00 is the HTS line for 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 percent of H3BO3 calculated on the dry weight. The base duty comes from the USITC HTS source field; final filing still depends on product specs, origin, special programs, Chapter 99, and broker review.

Description

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 percent of H3BO3 calculated on the dry weight

Data source and update date

Base source: USITC HTS revision feed. Retrieved: 2026-06-01; version: 2026-revision-9.

How the duty stack works

  1. 1Start with the source-backed MFN base duty: Free.
  2. 2Then review Section 301, Chapter 99, exclusions, and temporary layers by origin.
  3. 3Screen for Section 232, AD/CVD, quotas, safeguards, valuation, freight, and fixed fees.
  4. 4Use the calculator as a planning model; save official sources and confirm with a broker before filing.

Section 301 status

This page does not have enough public source evidence to publish this layer. Review USTR lists, Chapter 99 instructions, and exclusions separately.

Duty rate by origin

The same HS code can produce very different planning outcomes by origin. This table compares scenarios; it is not a final filing determination.

OriginMFNSection 301Section 122Section 232Planning viewNoteCompare in calculator
ChinaFreeReview requiredCurrent-status reviewProduct reviewBase Free + review layersHighest need for Section 301, Chapter 99, exclusions, and AD/CVD review.Compare in calculator →
VietnamFreeUsually not applicableCurrent-status reviewProduct reviewBase Free + current temporary-layer reviewUseful alternative-origin scenario; still verify temporary layers, origin, and product-specific measures.Compare in calculator →
Mexico (USMCA)Preferential if qualifiedUsually not applicableCheck USMCA qualificationProduct reviewPotentially 0% if USMCA-qualifiedRequires origin and USMCA documentation; transshipment is not origin transformation.Compare in calculator →
IndiaFreeUsually not applicableCurrent-status reviewProduct reviewBase Free + current temporary-layer reviewGood sourcing-alternative scenario; still verify by product and entry date.Compare in calculator →

Base HTS information

This section only publishes base HTS information with source fields attached. Base HTS and additional-duty review work stay separate so the page does not overstate unsupported composite estimates.

Base MFN rateFreeExact official field

HTS general rate field: Free

Rate-output note: only the base HTS field is shown here. Additional duties, Chapter 99 treatment, exclusions, or AD/CVD still require separate review.

Calculation method

Exact official field

Source name

USITC HTS revision feed

Source URL

https://www.usitc.gov/2026_hts_revision_9

Retrieved date

2026-06-01

Effective date

-

Version / revision

2026-revision-9

Confidence status

official-source

Review status

Verified

Visual calculation trace

The public page separates base HTS, additional layers, and public visibility. Dashed bars show a component may exist in the planning stack but is not yet source-complete enough to publish as a public rate.

Base HTS

Exact official field

Free

IEEPA / additional tariff layer

No source-backed public policy document is attached to this component yet, so the rate is hidden.

Still review-gated

Section 301 / Chapter 99 layer

No source-backed public policy document is attached to this component yet, so the rate is hidden.

Still review-gated

Public-readiness signals

Base-field precision

94%

Exact official field

Source freshness

88%

Inside freshness window

Public visibility

22%

Still review-gated

Calculation trace

  • HTS line 2528.00.00 maps to the USITC general duty field "Free".
  • The general duty field is a simple ad valorem rate, so the public base rate shown here is Free.

China → US review checklist

Treat the following items as a broker/compliance review checklist, not as an automated determination. The core checks are Chapter 99, Section 301, USTR exclusions, AD/CVD, quotas or safeguards, and broker confirmation.

HTS code has filing-level detail to review

success

The entered code (2528.00.00) is specific enough to start a rate review, but classification still requires product facts and broker/official confirmation.

Open USITC HTS search

Product facts captured for ruling comparison

success

Use the product description when comparing material, construction, principal use, and classification rationale from rulings.

Search CBP CROSS

USITC HTS candidate record returned

success

Candidate 2528.00.00: 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 percent of H3BO3 calculated on the dry weight. General duty field: Free.

Open USITC HTS search

Simple general duty rate parsed for planning

success

TariffsChart can apply Free as a planning base duty rate. Still verify special rates, units, footnotes, and applicability.

China-origin trade-remedy and Chapter 99 check required

danger

For China-origin goods, verify Section 301 coverage, exclusions, IEEPA/other current trade-remedy FAQs, and any required Chapter 99 secondary classifications. The automated result does not determine coverage.

Open CBP Section 301 FAQ

AD/CVD scope cannot be determined from HTS alone

danger

Search ACCESS/AD-CVD by country, product, commodity, case number, and HTS. Scope language controls; an HTS match is only a screening signal.

Open AD/CVD Search

Related HTS codes

Verified HTS detail pages from the same heading or chapter. Use them to compare adjacent classifications, materials, and use cases before broker review.

Chapter 25: Salt, sulfur, earths, stone, plastering materials, lime, and cement →
2501.00.00.00Base rate: Free

Salt (including table salt and denatured salt) and pure sodium chloride, whether or not in aqueous solution or containing added anti-caking or free-flowing agents; sea water

Source retrieved: 2026-06-01

2502.00.00.00Base rate: Free

Unroasted iron pyrites

Source retrieved: 2026-06-01

2503.00.00Base rate: Free

Sulfur of all kinds, other than sublimed sulfur, precipitated sulfur and colloidal sulfur

Source retrieved: 2026-06-01

2504.10.10.00Base rate: Free

Crystalline flake (not including flake dust)

Source retrieved: 2026-06-01

2505.10.10.00Base rate: Free

Sand containing by weight 95 percent or more of silica and not more than 0.6 percent of oxide of iron

Source retrieved: 2026-06-01

2506.20.00Base rate: Free

Quartzite

Source retrieved: 2026-06-01

2507.00.00.00Base rate: Free

Kaolin and other kaolinic clays, whether or not calcined

Source retrieved: 2026-06-01

2508.10.00.00Base rate: Free

Bentonite

Source retrieved: 2026-06-01

2508.30.00.00Base rate: Free

Fire-clay

Source retrieved: 2026-06-01

2508.40.01Base rate: Free

Other clays

Source retrieved: 2026-06-01

2508.50.00.00Base rate: Free

Andalusite, kyanite and sillimanite

Source retrieved: 2026-06-01

2508.70.00.00Base rate: Free

Chamotte or dinas earth

Source retrieved: 2026-06-01

Official-source openings

These are the official-source entry points this route should open and preserve before relying on any shipment assumption.

USITC HTS lookup for 2528.00.00

official-source · 2026-06-12

Candidate HTS: 2528.00.00 Description: 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 percent of H3BO3 calculated on the dry weight General rate field: Free Simple ad-valorem rate parsed for planning: Free

Open official source

CBP CROSS rulings search for 2528.00.00

official-source · 2026-06-12

Search for binding CBP rulings involving similar merchandise. Capture ruling number, date, product facts, classification rationale, and whether the facts match this SKU. CROSS examples help frame broker questions but do not automatically classify your product.

Open official source

CBP Section 301 China-origin check for 2528.00.00

official-source · 2026-06-12

For China-origin goods, verify whether the HTS classification is covered by Section 301 remedies, whether any exclusion applies, and which Chapter 99 secondary classification should be reported. Do not infer coverage from the base HTS line alone.

Open official source

USTR Section 301 actions and exclusions for 2528.00.00

official-source · 2026-06-12

Check USTR Section 301 tariff actions, exclusion notices, and extension status. Save the specific list/exclusion evidence if a product exclusion is claimed.

Open official source

AD/CVD scope check for 2528.00.00

official-source · 2026-06-12

Search Commerce ACCESS/AD-CVD resources by country, product, case number, HTS number, and commodity. AD/CVD scope can be broader or narrower than an exact HTS match; ask the broker whether a scope ruling or specialist review is needed.

Open official source

CBP China/Hong Kong IEEPA and other remedy check for 2528.00.00

official-source · 2026-06-12

Review whether any current CBP trade-remedy FAQ, CSMS message, or Chapter 99 note applies in addition to Section 301, base duty, AD/CVD, or other measures. This is a prompt for professional review, not an automated determination.

Open official source