Silicon Metal HS Code, Pre-Shipment Testing, and Standards Compliance

Silicon metal is a critical raw material used in aluminum alloys, chemical production, silicones, and specialty metallurgical applications. For industrial buyers, understanding the HS code, quality testing procedures before shipment, and the standards that silicon metal complies with is essential for smooth import/export operations and reliable production performance.

This article provides guidance on HS code classification, pre-shipment testing methods, and relevant industrial standards, helping procurement and technical teams make informed sourcing decisions.

As a professional silicon metal supplier, ZhenAn ensures compliant, traceable, and high-quality products for industrial customers worldwide.
For specifications, shipments, or quotations, contact info@zaferroalloy.com.

 

What Is the HS Code of Silicon Metal?

The Harmonized System (HS) code is used globally for customs classification and trade compliance. Silicon metal is classified under:

HS Code: 28047000 – "Silicon; silicon containing < 99.99% silicon by weight"

For high-purity silicon metal (>99.99%), some customs authorities may classify under specialized codes for polysilicon or electronic-grade silicon

Key Notes

The HS code applies for both lumps, granules, and powder forms

Proper HS classification ensures smooth import/export clearance and correct duty assessment

Suppliers typically include the HS code on commercial invoices and shipping documents

 

How Is Silicon Metal Tested Before Shipment?

Ensuring the chemical and physical quality of silicon metal before shipment is critical for customer satisfaction and process reliability.

Pre-Shipment Testing Methods

1. Chemical Analysis

Silicon content (Si): Must meet grade specifications (e.g., 553 ≥ 98.5%, 3303 ≥ 99.4%)

Impurities: Fe, Al, Ca, P, B, Ti, C

Methods Used:

Optical Emission Spectroscopy (OES) – fast and accurate

X-Ray Fluorescence (XRF) – routine batch verification

Wet chemical analysis – high-precision control

2. Physical and Particle Size Testing

Particle size distribution: lumps, granules, or powder

Surface condition: free from excessive oxidation, contamination, or cracks

Density and hardness: ensure furnace performance

3. Packaging & Traceability Checks

Proper sealing for lumps, granules, or powder

Correct labeling and batch numbers

Certificate of Analysis (COA) issued for every shipment

 

What Standards Does Silicon Metal Follow?

Silicon metal production and supply adhere to international and industrial standards to ensure quality, safety, and consistency.

Common Standards

Standard Type	Description
GB/T (China National Standard)	Specifies chemical composition, particle size, and impurity limits for metallurgical and chemical silicon
ASTM (American Standard)	Defines grades, Si content, and allowable impurities (ASTM B308 for silicon metal in aluminum alloys)
ISO (International Standard)	Covers specifications for silicon metal purity, packaging, and testing
Customer or Industry Standards	Some chemical, silicone, and solar manufacturers require high-purity silicon metal to meet internal quality thresholds

Key Considerations

Compliance ensures consistent process performance

Standards cover Si content, Fe/Al/Ca limits, particle size, and trace elements

Suppliers usually provide COA with reference to relevant standards

 

ZhenAn Silicon Metal Quality Assurance

ZhenAn provides silicon metal in compliance with:

GB/T, ASTM, ISO standards

Verified chemical composition per batch

Controlled particle sizes (lumps, granules, powder)

Pre-shipment testing and COA for traceability

Export-ready, compliant packaging

Our products are used globally in aluminum alloy casting, chemical processing, silicone production, and metallurgical applications.

For specifications, certifications, or quotations, contact info@zaferroalloy.com.

 

Frequently Asked Questions (FAQ)

What is the HS code for silicon metal?

The standard HS code is 28047000. High-purity silicon may have specialized codes.

How is silicon metal quality checked before shipment?

Through chemical composition analysis (Si and impurities), particle size inspection, surface condition assessment, and COA issuance.

Which international standards apply to silicon metal?

GB/T (China), ASTM (USA), ISO (International), and sometimes custom industry specifications.

Does ZhenAn provide a certificate of analysis for each shipment?

Yes. Every batch comes with a COA documenting chemical composition and compliance.

Are particle size and packaging also tested before shipment?

Yes. Lumps, granules, and powder are checked for size consistency, surface condition, and proper packaging.