Silica Sand to the United States: SDS, OSHA, Crystalline Silica and Importer Dossier

Exporting silica sand to the United States is not simply a matter of supplying a SiO₂ percentage. For a U.S. buyer, importer or customs broker, the dossier needs to connect the actual lot, its hazard communication, its customs classification, its origin, and its traceability.

The most important point is not to merge four different subjects: industrial sand quality, the presence of crystalline silica, occupational exposure to respirable dust, and customs classification. They interact, but they do not replace one another.

1. Who carries responsibility on the U.S. side?

OSHA’s Hazard Communication Standard, 29 CFR 1910.1200, defines an “importer” as the first business with employees within the Customs Territory of the United States that receives chemicals produced in another country for the purpose of supplying them to U.S. distributors or employers.

For a product covered by the HCS, the chemical manufacturer or importer must classify the hazards. The U.S. importer therefore becomes a central party for the Safety Data Sheet (SDS) and labeling used in the U.S. market.

This changes the commercial logic for a Moroccan exporter: a European technical sheet or an SDS prepared for another market can be a useful starting point, but it should not automatically be treated as the final U.S. dossier.

OSHA also requires a shipped hazardous chemical, where applicable, to carry the required product identifier and hazard communication elements together with the responsible party’s details. For imported hazardous chemicals, OSHA has stated that a U.S. address and U.S. phone number are required on the SDS and label when those documents are required.

2. SDS: information the importer must be able to use

Under the HCS, an SDS for a hazardous chemical must be available in English and follow the standard 16-section structure. The sections cover identification, hazards, composition, first aid, handling, exposure controls, physical and chemical properties, toxicology, regulatory information and other required headings.

For silica sand, the technical information supplied by the producer should allow the U.S. responsible party to build or validate an SDS that is consistent with the actual lot and the real product classification.

A robust supplier dossier typically contains:

• commercial and mineralogical product identification;
• SiO₂ and the main relevant impurities;
• available information on crystalline phase when this is needed for classification;
• contractual grading or particle-size distribution;
• moisture where it affects delivered mass, handling or the buyer’s process;
• analytical methods used;
• lot number and production or analysis date;
• safety information needed for the U.S. HCS review.

Following the HCS revision published in 2024, compliance provisions were phased in. After OSHA’s January 2026 extension, manufacturers, importers and distributors evaluating substances had to comply with the modified provisions by May 19, 2026. Employers have until November 20, 2026 for certain updates to workplace labeling, hazard communication programs and training related to substances. For a shipment in September 2026, the dossier should therefore be checked against the current 29 CFR 1910.1200 rather than an old generic SDS.

3. Crystalline silica: product composition ≠ respirable exposure

Crystalline silica is a major U.S. occupational-health topic, but two measurements are often confused:

1. the amount or form of crystalline silica present in the bulk material;
2. the concentration of respirable crystalline silica in workplace air.

OSHA sets a Permissible Exposure Limit (PEL) of 50 µg/m³ as an 8-hour time-weighted average for respirable crystalline silica, with an action level of 25 µg/m³.

These values are occupational airborne-exposure limits. They do not mean that the sand must contain less than 50 µg/m³ of quartz, and they are not a product-purity specification.

A coarse sand may contain a high proportion of quartz while generating different exposure levels depending on conveying, drying, pneumatic transfer, free fall, dry sweeping, crushing or other operations. Conversely, a high bulk SiO₂ analysis does not on its own describe the respirable fraction released in a real workplace situation.

For a U.S. buyer, the correct question is therefore twofold: what is the product composition? and how will the product be handled in the real process?

4. U.S. label: do not simply copy the European label

When a product is classified as hazardous under the HCS, the shipped-container label must follow 29 CFR 1910.1200. Depending on the actual classification, it may need:

• the product identifier;
• a signal word;
• hazard statements;
• applicable pictograms;
• precautionary statements;
• the name, U.S. address and U.S. telephone number of the responsible party.

The elements depend on the actual product classification. A supplier should therefore neither remove a hazard based on a commercial assumption nor add pictograms or statements “just in case” without a classification basis.

5. Certificate of Analysis: the document that connects the product to the lot

The SDS describes safety and hazard classification. The Certificate of Analysis (CoA) describes the supplied lot. The two documents serve different purposes.

For silica sand sold to a U.S. industrial buyer, a useful CoA may include, depending on the contract:

Block	Useful data	Why it matters
Identification	product, lot, date	links the analysis to the shipment
Chemistry	SiO₂, Fe₂O₃ and other relevant oxides	verifies process specification
Mineralogy	quartz / other phases when relevant	separates bulk chemistry from crystalline phase
Grading	agreed sieve results or PSD	controls process behavior
Moisture	method + result when contractual	supports mass and dosing corrections where needed
Methods	XRF, XRD, sieving, moisture, etc.	makes the reported values interpretable

No universal list fits every application. Glass, foundry, filtration and industrial-floor sands are not qualified against the same criteria.

6. HTS classification: 2505.10 is a starting point, not an automatic conclusion

The Harmonized Tariff Schedule of the United States (HTSUS) classifies natural silica sands and quartz sands under heading 2505.10.

Within Chapter 25, the structure includes:

• 2505.10.10: sand containing by weight at least 95% silica and not more than 0.6% iron oxide;
• 2505.10.50: other silica and quartz sands under 2505.10.

This distinction should not be selected only from the commercial name “silica sand.” Lot composition, the nature of the material and the classification rules should be reviewed by the importer or customs broker.

A second critical point in 2026 is that the Chapter 25 tariff line does not always determine the entire entry treatment. The HTSUS contains temporary Chapter 99 measures that can modify or add duties to certain imports. HTS revisions can change during the year; USITC had already issued 2026 HTS Revision 19 on September 15, 2026. The treatment applicable to a shipment therefore needs to be checked at the time of entry together with actual origin and any relevant exclusions or temporary measures.

7. U.S.–Morocco FTA: preferential origin must be supported

The U.S.–Morocco Free Trade Agreement has been in force since January 1, 2006. It can provide preferential treatment for goods that satisfy the applicable rules of origin.

However, “shipped from Morocco” and “originating in Morocco under the agreement” are not automatically the same statement.

CBP points importers to General Note 27 of the HTSUS and the agreement’s rules of origin. The dossier should therefore allow the importer to support a preferential claim if one is made.

For a mineral product, traceability of origin, processing and lot identity is especially useful. The final decision to claim preference belongs to the importer together with its customs broker or customs adviser.

8. Commercial invoice and entry dossier

CBP requires the commercial invoice, or acceptable substitute documentation, to provide enough information for entry. Key elements include:

• an adequate description of the merchandise;
• quantities;
• values;
• the appropriate eight-digit HTS subheading;
• the name and complete address of the foreign firm responsible for invoicing the merchandise.

For a commercial entry, the importer of record also coordinates entry documents, a customs bond where required, transport records and any other documents requested by CBP or another agency where a specific regime applies.

The Moroccan supplier therefore does not need to turn its technical dossier into the entire U.S. customs file. It does, however, need to provide data that are clean and traceable enough for the importer to meet its obligations without reconstructing the product identity after arrival.

9. Recommended supplier dossier before shipment

To reduce gaps between laboratory, commercial, safety and customs records, the dossier can be organized into four blocks.

Technical block

• agreed product specification;
• lot CoA;
• test methods;
• grading;
• moisture where relevant;
• mineralogical information needed for the application or classification.

HCS / safety block

• SDS applicable to the U.S. market;
• classification reviewed by the U.S. responsible party;
• corresponding label;
• consistency between product identifier, SDS and commercial documents.

Customs / origin block

• precise commercial description;
• proposed HTS code, validated by the importer;
• commercial invoice;
• packing list where used;
• transport documents;
• origin evidence where U.S.–Morocco preferential treatment is claimed.

Traceability block

• unique lot number;
• shipped mass;
• loading date;
• retained sample where contractually planned;
• match between the physical lot, CoA, invoice and SDS.

10. Practical qualification sequence

An effective qualification can follow this sequence:

1. Define the application and the U.S. customer’s acceptance criteria.
2. Qualify a representative sample before the first industrial order.
3. Freeze the commercial specification for chemistry, grading, moisture and other relevant criteria.
4. Align the U.S. SDS with the actual composition and HCS classification.
5. Validate HTS and origin with the importer or broker.
6. Produce the lot, sample it and issue its CoA.
7. Check document consistency before loading.
8. Perform receiving control on contractual parameters that may drift between lots.

This approach is more robust than relying on one SiO₂ value or on a generic SDS that is not tied to the real product.

Key takeaways

• In the United States, the HCS importer is a central regulatory party for imported hazardous chemicals.
• A U.S. SDS must match the actual classification and, when required, be available in English.
• 50 µg/m³ is an occupational exposure limit for respirable crystalline silica, not a quartz-content limit in the sand.
• The CoA and SDS do different jobs: one qualifies the lot; the other communicates hazards and protective measures.
• HTS 2505.10 is the classification family for natural silica and quartz sands, but the exact subheading, origin and Chapter 99 measures must be checked at the time of import.
• The U.S.–Morocco FTA does not remove the need to support preferential origin.
• For a first industrial purchase, a written specification, representative sampling and lot-by-lot traceability remain the strongest protection against disputes.

Regulatory note: this article is a technical supplier-qualification guide. It is not legal, customs or compliance advice. The U.S. importer, its customs broker and relevant HSE specialists should validate the requirements that apply to the product, lot and entry date.