industrial sieves, Part 1: Wire cloth sieves
1980 Edition

According to IS 2405 Part 1 (1980), the approved wire materials for manufacturing wire cloth sieves include:

• For mesh apertures between 20 µm and 224 µm: phosphor bronze, stainless steel, and monel.
• For apertures ranging from 250 µm to 900 µm: phosphor bronze, stainless steel, monel, and brass alloy (Cu70Zn30).

These materials are chosen based on durability and suitability for specific industrial sieving tasks. Selection depends on the aperture size and designated service grade, as detailed in Table 1 of the standard, which also correlates wire thickness and open area percentages.

Summary Table:

Additionally, wire cloth conforming to these materials may bear the ISI Certification Mark to signify adherence to quality and inspection criteria.

IS 2405 Part 1 mandates that wire cloth used in sieves must consist of uniformly woven square apertures, with aperture sizes ranging from 125 mm down to 20 µm. The diameters of warp and weft wires are measured individually using precise tools such as optical projectors or micrometers to ensure accuracy.

Wire diameter tolerances are outlined in Table 3 and apply separately to the warp and weft wires, ensuring consistent mesh quality. This detailed specification guarantees that the mesh maintains uniform size and shape across the entire sieve, critical for industrial screening performance.

IS 2405 Part 1 defines standard pairings of aperture dimensions and wire diameters for woven wire cloth sieves, categorized into five service grades: Heavy, Medium Heavy, Medium, Medium Light, and Light.

Key points from Table 1 include:

• Aperture sizes cover a range from 125 mm to 0.020 mm.
• Each aperture size corresponds to five distinct wire diameters matching the service grades.
• Each combination specifies an open area percentage, indicating the effective open mesh surface.

For instance, at a 50 mm aperture size:

Heavier grades use thicker wires, resulting in less open area but greater durability; lighter grades utilize thinner wires for higher open area. All combinations ensure uniform square apertures as per Clause 4.1.2.

To verify compliance with IS 2405 Part 1, the following testing protocol is recommended:

• Sampling should be performed on a per-lot basis, with the number of samples adhering to Level IV of Table 1 in IS 2500 (Part I)-1973.
• The Acceptance Quality Level (AQL) is set at 2.5%, as per Table 2 in IS 2500 (Part I)-1973, to determine lot acceptance or rejection.
• Physical tests include dimensional verification of aperture sizes and wire diameters, alongside visual and mechanical inspection to identify defects.

Wire cloths bearing the ISI Certification Mark have undergone rigorous inspection under ISI supervision, ensuring consistent quality. This systematic approach guarantees that all sieves meet the standard’s dimensional and material requirements.

IS 2405 Part 1 outlines specific marking and designation requirements for industrial wire cloth sieves:

• Marking:

  • Sieves can be marked with the ISI Certification Mark as per Clause 8.1.1, indicating conformity to the standard under ongoing quality control and inspection.
  • Application of the ISI mark is governed by the Indian Standards Institution (Certification Marks) Act.

• Designation:

  • Each sieve is identified by its aperture size and wire diameter (in millimeters or micrometers), followed by the term "IS industrial sieve" as specified in Clause 9.1.

Example designation:

This system ensures clear and standardized identification of sieve characteristics for industrial application.