Why Are Some Countries Excluded from the U.S. Quartz Safeguard Measure?

Key Takeaways

• Certain developing nations are excluded from the U.S. quartz surface product safeguard measure pursuant to U.S. Note 41(c)(iii) of the Presidential Proclamation issued on July 31, 2026 .
• Covered quartz surface products from non-excluded countries face a first-year tariff-rate quota with duties set at 25% within the quota and 50% above the quota, scheduled to apply from August 15, 2026, through August 14, 2027 .
• Developing country exclusions, such as the listing for Cambodia, are conditional and subject to revision if import volumes exceed specific percentage thresholds or if country status changes .
• B2B procurement managers, distributors, and fabricators must establish origin-verification protocols and monitor trade volume metrics to manage legal compliance and tariff risk effectively .

Introduction

The implementation of federal trade remedies on imported building materials creates immediate cost variations and supply chain adjustments across the countertop and surface industry. On July 31, 2026, the President of the United States issued a proclamation establishing a safeguard measure in the form of a tariff-rate quota for covered quartz surface products . Scheduled to become effective at 12:01 a.m. Eastern Time on August 15, 2026, this policy impacts major global manufacturing hubs that export quartz slabs and engineered stone to the U.S. market .

However, the policy does not apply uniformly across all trading partners. The official proclamation specifically excludes certain developing nations from the safeguard duties, creating distinct regulatory categories for international suppliers . For importers, distributors, contractors, and procurement professionals, understanding why specific countries are exempt—and how long those exemptions may last—is essential for making informed sourcing decisions and maintaining compliant cross-border supply chains.

This article examines the legal and policy rationale behind country exclusions under the U.S. quartz surface product safeguard measure, details the applicable tariff-rate quota structures, outlines the conditions under which an exemption can be modified or revoked, and provides practical verification guidelines for commercial buyers.

Structural and Legal Rationale for Developing Country Exclusions

Developing nations are granted exclusions from the U.S. quartz safeguard measure because U.S. trade policy frameworks explicitly accommodate small-scale exporter nations that do not individually or collectively disrupt domestic industries . Under U.S. Note 41(c)(iii) of the Presidential Proclamation's Annex, designated developing countries—including Cambodia—are listed for exclusion from both the safeguard tariff-rate quota and the safeguard duty rates, provided they satisfy all statutory criteria .

Trade safeguard measures are intended to provide temporary relief to domestic manufacturers facing a surge of competing foreign imports. However, trade laws balance this protectionist intent by establishing special provisions for developing countries. Under these legal frameworks, excluding smaller developing supply sources prevents severe economic disruption in developing trade partner nations while keeping overall safeguard protections intact against major exporting hubs.

For commercial buyers, this structural carve-out means that products sourced from listed developing countries enter the United States under a different tariff structure than non-exempt regions . Under the U.S. Presidential Proclamation issued on July 31, 2026, Cambodia is explicitly listed among the developing countries excluded from the safeguard measure on covered quartz surface products, subject to the specific conditions of the proclamation .

       ┌────────────────────────────────────────────────────────┐
       │   U.S. Quartz Safeguard Proclamation (July 31, 2026)   │
       └───────────────────────────┬────────────────────────────┘
                                   │
              ┌────────────────────┴────────────────────┐
              ▼                                         ▼
  Non-Excluded Countries                   Excluded Developing Countries
  (Subject to Tariff-Rate Quota)            (Listed under U.S. Note 41(c)(iii))
  • Effective Aug 15, 2026                • E.g., Cambodia
  • First-Year Rates:                       • 0% Safeguard Tariff-Rate Quota
    - 25% within quota                      • Exclusion is Conditional
    - 50% above quota                       • Subject to 3% / 9% Volume Caps

Safeguard Duty Structures for Non-Excluded Exporters

Importers sourcing covered quartz surface products from non-excluded countries are subject to a two-tiered tariff-rate quota structure that significantly increases entry costs . For covered imports originating from countries not exempt under U.S. Note 41(c), the proclamation establishes specific first-year safeguard rates applying to entries on or after August 15, 2026 .

The first-year rates for non-excluded imports entering between August 15, 2026, and August 14, 2027, are categorized into two primary duty tiers:

1. Within Tariff-Rate Quota Rate: A 25% safeguard duty applies to entries within the established quota allocation .
2. Above Tariff-Rate Quota Rate: A 50% safeguard duty applies to all covered entries exceeding the designated quota allocation .

It is critical for procurement teams to note that these safeguard duties are part of the specific trade remedy measure and do not mean that every single quartz import from every foreign origin is subject to those rates . Excluded developing countries listed under Note 41(c)(iii) bypass these additional quota rates as long as their exempt status remains legally active .

Conditional Exclusions and Dynamic Threshold Limits

A country's status as an excluded developing nation is strictly conditional and subject to ongoing monitoring and potential administrative revision . The inclusion of a nation like Cambodia on the exempt list under U.S. Note 41(c)(iii) does not guarantee permanent immunity from safeguard tariffs .

The Presidential Proclamation outlines explicit conditions under which an excluded developing country's status may be reviewed, modified, or terminated :

• Individual Import Share Limit: If an individual listed developing country's share of total U.S. imports of covered quartz surface products exceeds 3% based on a recent representative period .
• Collective Import Share Limit: If the total import volume from all listed developing countries individually accounting for less than 3% collectively exceeds 9% of total aggregate imports .
• Status Reclassification: If a listed nation is no longer recognized or treated as a developing country for the purposes of the presidential proclamation .
• Administrative Modifications: If other authorized adjustments or policy updates are issued under executive authority .

Because these threshold triggers are tied directly to import statistics, rapid shifts in global manufacturing allocations can quickly consume market share allowances. If suppliers aggressively shift production to an exempt developing nation, that country may breach the 3% individual threshold or contribute to exceeding the aggregate 9% cap, thereby triggering a policy review and potential removal from the exclusion list .

Key Elements of the U.S. Quartz Safeguard Policy

To help procurement officers and compliance managers contrast policy parameters, the operational framework of the safeguard policy is summarized below.

Risk Mitigation and Supply Chain Verification Guidelines

Commercial buyers should establish a systematic compliance process to verify country-of-origin documentation and protect against unexpected tariff liabilities . Relying solely on supplier claims regarding safeguard exemptions exposes importers to significant financial risks, including retroactive customs duties and penalties.

To ensure regulatory compliance and secure legitimate country-of-origin exclusions, B2B buyers should implement the following steps:

1. Verify Official Classification: Confirm that the imported quartz surface product falls within the exact scope described by the Presidential Proclamation issued on July 31, 2026 .
2. Validate Origin Documentation: Require primary documentation proving substantial transformation and origin, including raw material source logs, slab pressing records, factory inspection reports, and official bills of lading from the origin nation (e.g., Cambodia) .
3. Incorporate Policy Clauses in Contracts: Structure supply contracts to address regulatory shifts, explicitly assigning liability and renegotiation rights if a country's status under U.S. Note 41(c)(iii) changes during the contract term .
4. Monitor Import Quota Volume Tracking: Track official U.S. Customs and Border Protection (CBP) quota bulletin updates and import share trends to anticipate potential threshold breaches before goods arrive at U.S. ports of entry .

Frequently Asked Questions

Which countries are excluded from the U.S. quartz safeguard measure?

Developing countries listed under U.S. Note 41(c)(iii) of the Presidential Proclamation Annex, including Cambodia, are listed for exclusion from the safeguard tariff-rate quota and safeguard duty rates, subject to applicable conditions .

What are the safeguard duty rates for non-excluded countries?

For covered quartz surface products from non-excluded countries, the first-year safeguard rates applying from August 15, 2026, through August 14, 2027, are 25% within the tariff-rate quota and 50% above the tariff-rate quota .

When does the U.S. quartz safeguard measure take effect?

The safeguard measure is scheduled to become effective for covered goods entered for consumption, or withdrawn from warehouse for consumption, on or after 12:01 a.m. Eastern Time on August 15, 2026 .

Under what conditions can an excluded country lose its tariff exemption?

An exclusion may be revised if a country's import share exceeds 3% individually, if small developing suppliers collectively exceed 9% of total imports, if the country loses its developing nation status, or if other authorized policy modifications are made under the proclamation .

Conclusion

The exclusion of certain developing countries from the U.S. quartz surface product safeguard measure offers strategic trade alternatives for importers seeking to maintain competitive supply chains . Under the Presidential Proclamation issued on July 31, 2026, nations such as Cambodia are granted exclusion under U.S. Note 41(c)(iii), bypassing the steep 25% in-quota and 50% above-quota duties imposed on non-exempt exporters starting August 15, 2026 .

However, because these developing country exclusions are strictly conditional upon market share thresholds (such as the 3% individual and 9% aggregate caps), commercial buyers must treat exempt status as a dynamic policy variable rather than a permanent certainty .

Next Steps for Buyers: Review all foreign supply chain agreements effective after August 15, 2026 . Request complete manufacturing, origin, and shipping documentation from suppliers operating in exempt regions like Cambodia, and mandate transparent trade-compliance verification in all procurement contracts .