Find HS Code and trade information for powder sieve

Powder Sieve

A powder sieve, also known as a mesh sieve, screen sieve, or simply sieve, is a filtration device used to separate particles of different sizes. It consists of a fine mesh held in a frame, typically circular. The mesh size is defined by the number of openings per inch, with higher numbers indicating finer meshes and smaller particle retention.

Material

Powder sieves are constructed from a variety of materials, selected based on the application and the properties of the powder being sieved. Common materials include:

• Stainless Steel: The most common material due to its corrosion resistance, durability, and ease of cleaning. Suitable for a wide range of powders, including those used in pharmaceuticals, chemicals, food processing, and cosmetics. Different grades of stainless steel (e.g., 304, 316) are used depending on the corrosivity of the material.
• Brass: Used for applications where magnetism is a concern, as brass is non-magnetic. Less corrosion-resistant than stainless steel.
• Bronze: Offers good corrosion resistance and is often used for sieving abrasive materials.
• Plastic (Nylon, Polypropylene): Lightweight and suitable for applications where contamination is a concern or where metal contact must be avoided. Often used for sieving powders in the electronics industry.
• Copper: Used in specialized applications due to its conductivity and resistance to certain chemicals.

Purpose & Function

The primary purpose of a powder sieve is particle size separation. This is achieved by passing the powder through the mesh.

• Particles smaller than the mesh openings pass through, forming the undersize fraction.
• Particles larger than the mesh openings are retained on the sieve, forming the oversize fraction.

This separation is critical for various processes, including:

• Quality Control: Ensuring consistent particle size distribution in raw materials and finished products.
• Preparation: Removing agglomerates or unwanted large particles from powders.
• Analysis: Determining the particle size distribution of a sample for research and development.
• Purification: Separating fine impurities from coarser materials.

Usage Scenarios

Powder sieves are employed across numerous industries:

• Pharmaceuticals: Sieving APIs (Active Pharmaceutical Ingredients), excipients, and finished drug products to ensure uniformity and bioavailability.
• Chemical Industry: Separating catalysts, pigments, and other chemical compounds.
• Food Processing: Sieving flour, sugar, spices, and other food ingredients to improve texture and consistency.
• Cosmetics: Sieving powders used in makeup, lotions, and other cosmetic products.
• Construction: Sieving aggregates (sand, gravel) to ensure proper concrete mix.
• Electronics: Sieving powders used in the manufacturing of semiconductors and other electronic components.
• Mining & Geology: Separating mineral samples for analysis.
• Paint & Coatings: Sieving pigments and fillers to ensure smooth paint application.

Common Types

Powder sieves are available in various configurations:

• Hand Sieves: Simple, portable sieves used for small-volume sieving. Require manual shaking or tapping to facilitate particle passage.
• Ro-Tap Sieve Shakers: Mechanical sieve shakers that provide consistent and reproducible sieving results. The shaker oscillates or vibrates, promoting particle movement through the mesh.
• Ultrasonic Sieve Shakers: Utilize ultrasonic vibrations to enhance particle passage, particularly for fine powders that tend to clump.
• Vibrating Sieves: Larger, automated sieving systems used for high-volume production.
• Air Sifters: Utilize air currents to separate particles based on size and density.
• Test Sieve: Standardized sieves used for particle size analysis according to ASTM or ISO standards. These typically have a diameter of 8 inches (203 mm) and are used with sieve shakers.
• Stack Sieves: Multiple sieves of decreasing mesh size stacked on top of each other, allowing for simultaneous separation of particles into different size fractions.

Based on the provided information, “powder sieve” can be classified under the following HS codes:

• 8474100010: This HS code covers machinery for sorting, screening, separating, washing, crushing, grinding, mixing or kneading earth, stone, ores or other mineral substances, in solid (including powder or paste) form. Specifically, it applies to portable machinery of this type. The two-digit sections represent:

  • 84: Machinery and mechanical appliances.
  • 74: Machinery for sorting, screening, separating, classifying, washing, drying, pulverizing and mixing earth, stone, ores, mineral substances, etc.
  • 1000: Sorting, screening, separating or washing machines.
  • 10: Portable machines.

• 8474100090: This HS code also covers machinery for sorting, screening, separating, washing, crushing, grinding, mixing or kneading earth, stone, ores or other mineral substances, in solid (including powder or paste) form. However, it applies to stationary machinery of this type. The two-digit sections represent:

  • 84: Machinery and mechanical appliances.
  • 74: Machinery for sorting, screening, separating, classifying, washing, drying, pulverizing and mixing earth, stone, ores, mineral substances, etc.
  • 1000: Sorting, screening, separating or washing machines.
  • 90: Stationary machines.

• 9604000000: This HS code covers hand sieves and hand riddles. The two-digit sections represent:

  • 96: Miscellaneous manufactured articles.
  • 04: Hand sieves and hand riddles.

Regarding HS code 8474100010 and 8474100090, the applicable tax rate is 55.0%, comprising a 0.0% base tariff, a 25.0% additional tariff, and a 30.0% additional tariff effective April 2, 2025.

Regarding HS code 9604000000, the applicable tax rate is 42.4%, comprising a 4.9% base tariff, a 7.5% additional tariff, and a 30.0% additional tariff.