Test Sieves: Part-I Wire Cloth Test Sieves

IS 460 (Part 1) - 1985: Introduction and Scope - Key Specifications

1. Nominal Aperture Sizes and Tolerances (Clause 3.2, Table 2)

• Aperture size W has:
  • Maximum tolerance for any one aperture: +X (mm)
  • Tolerance for average aperture size: ±r (mm)
  • Intermediate tolerance: +Z (mm)
• Wire diameters associated with apertures:
  • Preferred size d
  • Permissible range: d_min to d_max

Note: Sizes marked '' are principal ISO sizes.*

2. Perpendicularity of Wires (Clause 3.3.1)

• No fixed tolerance specified.
• ±3° tolerance acceptable on warp and weft wires.
• Visual inspection over several apertures recommended.

3. Test Sieve Frames (Clause 4.1 & 4.2, Tables 3 & 4)

• Materials for frames:

  • Brass sheet (IS:410-1977)
  • Stainless steel sheet (IS:6911-1972)
  • Galvanized steel sheet (IS:277-1977) for ≥300 mm
  • Electroplated steel sheet (IS:519-1973)

• Recommended frame sizes and shapes:

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IS 460 Part 1 - Scope: Key Specifications & Tables

1. Nominal Aperture Sizes & Tolerances (Clause 3.2, Table 2)

• Defines nominal aperture sizes W (mm) with tolerances:
  • Maximum tolerance for any one aperture (+X)
  • Tolerance for average aperture size (±r)
  • Intermediate tolerance (+Z)
• Specifies wire diameters (d) for preferred size and permissible range.

(Refer to full Table 2 for complete sizes)

2. Test Sieve Frames (Clause 4.2, Table 4)

• Recommended shapes: Round or Square
• Sizes: 200 mm, 300 mm, 450 mm nominal
• Key dimensions (all in mm):

IS 460 Part 1 - Designation of Test Sieves: Key Points

1. Designation of Test Sieves (Clause 2.1)

• Test sieves are designated by the nominal aperture size of the wire cloth followed by "IS Sieve".
• Examples:
  • 5.60-mm IS Sieve
  • 425-μm IS Sieve

2. Recommended Shapes & Sizes of Sieve Frames (Clause 4.2, Table 4)

• *A and B dimensions ensure nesting of sieves.
• Note: Depth from top edge may be 25 mm if required.
• Fine wire mesh in large sieves may be supported by a spider.

3. Labeling Requirements (Clause 10.1)

Each sieve frame must have a label with:

• Designation (bold, left side)
• Wire cloth material
• Frame material
• Maker's name or trademark
• Identification number
• Wire diameter (if requested)

4. Rounding Off (Clause 9.1)

• Final test values must be rounded per **IS

IS 460 Part 1 - Key Details on Sieving Medium

1. Materials for Sieving Media (Clause 3.1 & Table 1)

• Note: No plated/coated wires allowed.
• Manufacturer to declare material grades if requested.

2. Aperture Sizes & Units (Clause 2.2)

• Apertures ≥ 1 mm: Dimensions in mm.
• Apertures < 1 mm: Dimensions in µm.

3. Aperture Tolerances & Wire Diameters (Table 2 excerpt)

(Refer to full Table 2 for all sizes)

4. Test Sieve Frame Dimensions (Table 4, Clause 4.2)

| Shape | Nominal Size (mm) | Top Internal Diameter/Length (mm) | Bottom External Diameter/Length (mm) | Min Thickness (mm) | Effective Sieving Surface Diameter/Length (mm) | Depth from Top Edge (mm) | Depth from Bottom Edge (

IS 460 Part 1: Test Sieve Frame Key Details

1. Materials for Test Sieve Frames (Clause 4.1, Table 3)

2. Recommended Shapes & Sizes (Clause 4.2, Table 4)

• Notes:
  • Sieves may have 25 mm depth from top edge if desired.
  • Fine wire mesh in large sieves should be supported (e.g., spider support).
  • Dimensions A and B ensure nestability.

3. Aperture Limits (Clause 3.4.5)

• For sieves with <50 apertures, max 3 apertures allowed between nominal +X and nominal +Z limits.

Summary Diagram: Test Sieve Frame Dimensions

graph TD
   

IS 460 Part 1: Surface Finish and Seal Key Points

Surface Finish (Clause 5.1)

• Sieving surface, frame receivers, and covers must be smoothly finished.
• Seal between frame and sieving medium must prevent lodging of material.
• No lacquer on surfaces in contact with samples to avoid contamination.

Seal Requirements

• Seal should be continuous and tight to avoid sample trapping.
• Material lodging prevention ensures accurate sieving.

Aperture Size & Wire Diameter Tolerances (Clause 3.2 & Table 2)

(Refer to full Table 2 for all sizes.)

Materials for Frames (Clause 4.1 & Table 3)

• Brass sheet (IS: 410-1977)
• Stainless steel sheet (IS: 6911-1972)
• Galvanized steel sheet (IS: 277-1977) for sizes ≥ 300 mm
• Electroplated steel sheet (IS: 519-1973)

Additional Notes

• Perpendicularity tolerance ±3° may be accepted (Clause 3.3.1).
• No lacquer on contact surfaces to maintain sample integrity.

Summary Diagram: Surface Finish & Seal Concept

flowchart LR
    A[Sieving Surface] --> B[Smooth Finish]
    B --> C[Seal with Frame]
    C --> D[Prevents

Nesting of Sieves (IS 460 Part 1 - Clause 4.2 & 6.1)

The test sieves must nest snugly with each other, lids, and receivers of the same shape and size to ensure proper stacking and testing.

Key Dimensions from Table 4 (All in mm):

• A and B dimensions ensure nestability.
• Depth from top to sieving surface may be 25 mm if desired (Note 1).
• Large sieves with fine wire mesh may require support (spider) (Note 2).

Important:

• Sieves must nest snugly (Clause 6.1).
• Rounding off test results per IS 2-1960 for compliance.

graph TD
    A[Test Sieve Frame] --> B[Top Internal Diameter (A)]
    A --> C[Bottom External Diameter (B)]
    A --> D[Thickness (T)]
    A --> E[Effective Sieving Surface (E)]
    A --> F[Depth Top to Sieving Surface (C)]
    A --> G[Depth Bottom to Sieving Surface (D)]
    B & C --> H[Nestable Sieves]

This ensures proper stacking and accurate test results according to IS 460 Part 1.

Key Specifications & Formulas for Mounting Wire Cloth (IS 460 Part 1)

1. Mounting Requirements (Clause 7.1)

• Wire cloth must be mounted firmly and equally taut in all directions.
• No distortion of the mesh is allowed.
• Ensures uniform aperture size and accurate test results.

2. Wire Cloth Weave (Clause 3.3)

• Plain weave produces uniform square apertures.
• Twilled weave allowed for apertures ≤ 63 µm.
• For apertures ≥ 4.00 mm, wires must be crimped before weaving.

3. Wire Diameter & Aperture Tolerances (Clause 3.2 and Table 2)

• Average wire diameter must be uniform across the sieve.
• Preferred wire diameter (d), Max (dmax), and Min (dmin) diameters are specified per aperture size.
• Aperture size tolerances include max tolerance for any one aperture and average aperture size tolerance.

(Refer full Table 2 for all sizes)

Summary Diagram: Mounting Wire Cloth

flowchart LR
    A[Wire Cloth] --> B[Mount in Frame]
    B --> C{Ensure

IS 460 Part 1 - Key Specifications for Wire Cloth Test Sieves

Materials for Wire Cloth (Clause 3.1, Table 1)

Note: Plated/coated wires are not permitted.

Aperture Tolerances & Wire Diameters (Clause 3.4.1, Table 2)

For full table, refer to IS 460 Part 1 Table 2.

Perpendicularity of Wires (Clause 3.3.1)

• No strict tolerance specified.
• ±3º from perpendicularity is acceptable.
• Visual inspection over multiple apertures is standard.

Testing & Calibration (Clause 8.1)

• Aperture examination per IS 460 Part 3 - 1985.
• Calibration tests must be specified in enquiry/order.

Designation (Clause 2.1)

• Test sieves are named by aperture size + "IS Sieve".

Example:

• 5.60-mm IS Sieve
• 425-µ

IS 460 Part 1: Information to be Supplied by Purchaser (Clause 9.1)

When ordering sieves, the purchaser must specify:

• Designation of sieve (nominal aperture size)
• Sieving medium: material type (see Clause 3.3.1 for wire perpendicularity tolerance ±3º if required)
• Frame: shape, size, and material
• Receiver: whether required
• Cover: whether required
• Calibration test: if to be performed (Clause 8.1)
• Statement on wire diameter: if required

Key Table: Aperture Tolerances & Wire Diameters (Excerpt from Table 2)

Notes:

• Calibration tests per IS 460 Part 3 must be explicitly requested.
• Wire perpendicularity tolerance is purchaser-dependent; ±3º is common.
• Frame and cover requirements must be clearly stated.
• Wire diameter info is optional but often needed for quality control.

flowchart TD
    A[Purchaser's Order

IS 460 Part 1: Marking Key Points & Specifications

Clause 10.3 - Use of Standard Mark

• Governed by BIS Act, 1986 and related rules.
• Licence for Standard Mark use granted by Bureau of Indian Standards (BIS).
• Contact BIS for licensing details.

Clause 10.1 - Labeling Requirements on Sieves

Each sieve frame must have a label with:

• Designation (bold, easily readable)
• Material of wire cloth (e.g., Stainless Steel)
• Material of sieve frame (e.g., Brass)
• Maker's name or trademark
• Identification number
• Wire diameter (if requested by purchaser)

Example label format:

STAINLESS STEEL WIRE    BRASS FRAME    No 12345

Clause 3.2 & Table 2 - Aperture Sizes & Tolerances

• Nominal aperture sizes with maximum tolerance (+X), average tolerance (±r), and intermediate tolerance (+Z).
• Wire diameters listed as preferred size (d) and permissible range (d_min to d_max).

(Refer to full Table 2 in IS 460 Part 1 for complete sizes)

Summary Diagram: Label Information Flow

flowchart LR
    A[Sieve Frame] --> B[

IS 460 (Part 1) - 1985: Calibration & Compliance Key Points

1. Aperture Size & Tolerances (Clause 3.2, Table 2)

• Nominal Aperture Sizes (W) have specified tolerances:
  • Maximum tolerance for any one aperture (+X)
  • Tolerance for average aperture size (±r)
  • Intermediate tolerance (+Z)
• Wire diameters are specified as:
  • Preferred size (d)
  • Permissible range (d max, d min)

Refer to Table 2 for complete sizes.

2. Perpendicularity of Wires (Clause 3.3.1)

• No fixed tolerance specified.
• ±3° is generally acceptable.
• Visual inspection over several apertures recommended.

3. Test Sieve Frame Materials (Clause 4.1, Table 3)

• Brass sheet (IS:410-1977)
• Stainless steel sheet (IS:6911-1972)
• Galvanized steel sheet (IS:277-1977) for ≥300 mm size
• Electroplated steel sheet (IS:519-1973)

4. Test Sieve Frame Dimensions (Clause 4.2, Table 4)

• Round and square frames with nominal sizes 200, 300, 450 mm.
• Thickness: 0.45 mm (200 mm size), 1.0 mm (300 mm and above)
• Effective

Key Formulas, Tables & Specifications from IS 460 (Part 1) - 1985

1. Table 2: Nominal Aperture Sizes, Tolerances & Wire Diameters

• Note: Sizes marked '*' are principal ISO sizes; 't' are temporary sizes.

2. Table 4: Recommended Test Sieve Frame Dimensions