Test Sieves: Part-I Wire Cloth Test Sieves 1985 Edition
The 1985 edition of IS 460 Part 1 establishes detailed criteria for wire cloth test sieves used in particle size separation. It outlines specifications for sieve frame materials, dimensions, wire cloth characteristics, aperture size limits, and labeling protocols. This code is vital for manufacturers, suppliers, and users to guarantee uniformity and precision in particle size testing.
The 1985 edition of IS 460 Part 1 establishes detailed criteria for wire cloth test sieves used in particle size separation. It outlines specifications for sieve frame materials, dimensions, wire cloth characteristics, aperture size limits, and labeling protocols. This code is vital for manufacturers, suppliers, and users to guarantee uniformity and precision in particle size testing.
Audience
Who Uses This Standard
Engineers specializing in material testing
Quality assurance professionals
Laboratory analysis personnel
Producers of testing sieves
Civil and geotechnical engineering experts
Mining and mineral processing engineers
R&D specialists in material characterization
Contents
Key Topics Covered
✓Specifications for wire cloth materials
✓Standard aperture sizes and permissible deviations
✓Sieve frame construction materials and dimensions
✓Types of weave and wire diameters for sieving media
✓Compatibility and nesting of test sieves
✓Labeling and marking criteria
✓Procedures for calibration and testing
✓Information requirements for purchasers
✓Standardized sizes and forms of test sieves
✓Permissible aperture size variations
✓Specifications for covers and receivers
✓Manufacturing and quality assurance practices
Structure
Table of Contents
0Overview and Application▼
IS 460 Part 1 (1985) - Overview and Application - Core Specifications
Nominal aperture sizes with defined tolerances including maximum single aperture variation, average aperture tolerance, and intermediate tolerance.
Wire diameters specified as preferred size and allowable ranges.
Tables provide numerical limits for apertures and wire diameters.
Guidelines on perpendicularity of wires with a ±3° tolerance accepted.
Materials accepted for sieve frames including brass, stainless steel, galvanized steel (for sizes ≥300 mm), and electroplated steel.
Recommended sieve frame shapes and dimensions ensuring proper nesting.
1Scope and Size Specifications▼
Defines the nominal aperture dimensions and corresponding tolerance limits.
Aperture size tolerances include maximum single aperture deviation (+X), average aperture size tolerance (±r), and intermediate tolerance (+Z).
Wire diameter specifications for preferred and permissible size ranges.
Standard frame shapes (round and square) and nominal sizes (200 mm, 300 mm, 450 mm) with detailed dimensional requirements to ensure compatibility and nesting.
2Test Sieve Designation and Frame Specifications▼
Test sieves are designated by the nominal aperture size of the wire cloth with suffix "IS Sieve".
Examples: 5.60 mm IS Sieve, 425 µm IS Sieve.
Frame materials and dimensions as per standard tables.
Labeling includes designation, wire cloth and frame materials, manufacturer’s name or trademark, identification number, and, if requested, wire diameter.
Rounding off test results as per IS guidelines.
3Sieving Medium Characteristics▼
Materials for wire cloth include phosphor bronze for apertures under 250 µm, brass for apertures 250 µm to 16 mm, and stainless steel for all sizes.
Plated or coated wires are prohibited.
Aperture size units differ based on size: millimeters for apertures ≥1 mm and micrometers for smaller.
Detailed aperture tolerances and wire diameter information provided.
4Sieve Frame Material and Dimensions▼
Approved materials for sieve frames include:
Brass sheet (all sizes)
Stainless steel sheet (all sizes)
Galvanized steel sheet (for sizes 300 mm and above)
Electroplated steel sheet
Recommended frame sizes and shapes with exact dimensions to allow nesting and effective sieving surface area.
Notes on depth dimensions and support for fine wire mesh in larger sieves.
5Surface Finish and Sealing Requirements▼
The sieving surface, frame receivers, and covers must have a smooth finish.
Seal between frame and wire cloth should prevent material lodging.
Surfaces in contact with samples must not be coated with lacquer to avoid contamination.
Detailed aperture size and wire diameter tolerances reiterated.
Materials specified for sieve frames are restated.
6Nesting and Compatibility of Sieves▼
Test sieves must fit snugly with each other, as well as with lids and receivers of matching size and shape.
Key dimensions ensure nestability.
Possible allowance for increased depth from top edge.
Large sieves with fine mesh may require additional support structures.
Compliance with rounding off test results as per IS standards.
7Mounting Wire Cloth in Frames▼
Wire cloth must be firmly and evenly stretched in all directions to prevent distortion.
Plain weave is standard; twilled weave permitted for apertures ≤63 µm.
For apertures ≥4 mm, wire crimping before weaving is required.
Uniform wire diameter across the sieving surface is necessary.
Recommended frame sizes correlate with aperture sizes.
8Testing and Calibration Procedures▼
Materials allowed for wire cloth and their aperture size ranges are detailed.
Aperture size and wire diameter tolerances are specified.
Wire perpendicularity tolerance of ±3° is generally acceptable.
Aperture examination is conducted as per IS 460 Part 3 (1985).
Calibration testing is optional and must be explicitly requested by the purchaser.
9Purchaser’s Ordering Information▼
Purchasers should specify:
Sieve designation (aperture size)
Sieving medium material
Frame shape, size, and material
Requirement for receiver and cover
Whether calibration testing is needed
Whether wire diameter details are required
Labeling includes key identification information to ensure traceability.
10Marking and Labeling Details▼
Marking requirements include:
Use of BIS Standard Mark under license.
Each sieve frame must bear a label with designation, wire cloth and frame materials, manufacturer’s name/trademark, identification number, and optional wire diameter.
Aperture sizes and tolerances with associated wire diameter specifications are provided.
11Calibration and Compliance Requirements▼
Nominal aperture sizes and tolerances are reiterated.
Wire perpendicularity tolerance is ±3°.
Sieve frame materials and dimensions are restated.
Compliance with specified dimensions and tolerances ensures standard conformity.
Table 4 detailing recommended test sieve frame dimensions including shape, size, thickness, and effective sieving surface measurements.
Notes on ISO principal sizes and temporary sizes.
Frequently Asked
Popular Questions About IS 460 PART 1
?Which materials are approved for wire cloth and sieve frames in IS 460 Part 1?▼
IS 460 Part 1 (1985) permits the following materials:
For wire cloth:
Phosphor bronze (IS: 7608-1975) for apertures smaller than 250 µm
Brass (IS: 4413-1981) for apertures from 250 µm to 16 mm
Stainless steel (IS: 6528-1972) for all aperture sizes
Plated or coated wires are not allowed.
For sieve frames:
Brass sheet (IS: 410-1977) for all sizes
Stainless steel sheet (IS: 6911-1972) for all sizes
Galvanized steel sheet (IS: 277-1977) for sizes 300 mm and above
Electroplated steel sheet (IS: 519-1973)
Manufacturers should declare material grades upon purchaser request.
?What are the standard aperture sizes and their tolerance limits according to IS 460 Part 1?▼
IS 460 Part 1 defines nominal aperture sizes (W) along with tolerances including:
Maximum positive deviation for any single aperture (+X)
Average aperture size tolerance (±r)
Intermediate tolerance (+Z)
These tolerances apply separately to warp and weft directions, with aperture measurements taken along aperture center lines. No aperture may exceed the nominal size by more than +X, and the average aperture size must stay within ±r of the nominal. Refer to Table 2 of IS 460 Part 1 for precise numerical values corresponding to each aperture size.
?How should wire cloth be installed in the sieve frame to maintain accuracy?▼
To ensure precision per IS 460 Part 1:
The wire cloth must be firmly fixed and stretched evenly in all directions to avoid any mesh deformation.
The weave should be plain for uniform square apertures; twilled weave is permissible only for apertures 63 µm or smaller.
For apertures 4 mm and above, wires must be crimped before weaving.
After mounting, uniformity of wire diameter across the sieving surface must be confirmed.
Use appropriate frame sizes corresponding to aperture sizes to maintain integrity.
?What details should a purchaser provide when ordering test sieves under this standard?▼
When placing orders for test sieves per IS 460 Part 1 Clause 9.1, purchasers must specify:
Designation of sieve (nominal aperture size or mesh number)
Material of the sieving medium (e.g., stainless steel wire cloth)
Frame shape, size, and material
Whether a receiver pan is required
Whether a cover is needed
If a calibration test should be performed
Whether a statement regarding wire diameter is requested
This ensures the product meets the purchaser’s requirements and complies with standard specifications.
?Are calibration tests mandatory under IS 460 Part 1, and how should they be requested?▼
Calibration tests for wire cloth test sieves under IS 460 Part 1 are not compulsory by default. As per Clause 8.1, aperture examination must be conducted following IS 460 Part 3 (1985). However, calibration testing is optional and only performed if explicitly requested by the purchaser. Such requests must be clearly stated in the enquiry and confirmed in the purchase order to ensure compliance.
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