wire cloth for general purposes
1970 Edition

IS 1568 outlines standardized aperture sizes alongside corresponding wire thicknesses for general-purpose wire mesh. The standard includes a table listing recommended wire diameters for each aperture dimension, which can be either rectangular or square in shape. Deviations in wire thickness are permitted if mutually agreed, following the R40 series of preferred numbers. Aperture size refers to the unobstructed opening between wires, and measurements require sampling multiple fields to ensure accuracy. Typical values include wire diameters ranging from 0.15 to 1.00 mm for aperture sizes between 0.5 mm and 5.0 mm. This alignment between aperture and wire thickness ensures structural integrity and filtration efficiency.

According to IS 1568, wire mesh can be manufactured using materials such as brass, bronze, mild steel, aluminium alloys, and plastics. Material specifications, including any protective coatings, must be agreed upon by both purchaser and manufacturer. The standard offers flexibility in mesh dimensions and aperture configurations to suit various applications like insect screens and general filtration. This selection ensures compatibility with industry practices and Indian manufacturing capabilities.

Tolerances for aperture dimensions and wire thickness under IS 1568 are defined with specific measurement procedures. Aperture widths must be measured across both warp and weft directions over 10 or 15 separate fields, ensuring no single wire overlaps multiple measurement areas. The average aperture must fall within tolerance limits specified in the standard's tables, while individual apertures have broader permissible variations. Wire diameter is also measured at multiple points and must comply with defined tolerances. Measurement masks are used to select appropriate fields for sampling. This approach guarantees consistency and quality in wire mesh products.

The standard mandates that wire mesh be wrapped in kraft paper prior to packaging to protect it during storage and transportation. Final packing methods should be agreed upon with the purchaser. Each package must be clearly labeled with the wire mesh designation, including aperture size and wire diameter, as well as the width and length of the mesh, and the manufacturer’s name or trademark. These measures ensure product protection and traceability.

Sampling under IS 1568 involves randomly selecting one roll from every five delivered. From the chosen roll, a sample at least 600 mm long across the full width is cut for inspection. The sample undergoes tests to verify all specified requirements such as wire diameter and mesh size. If the sample fails any test, the entire batch represented by that sample is rejected. This systematic sampling and testing protocol maintains product quality and conformity to the standard.