IS 7328:2020 addresses polyethylene materials for molding and extrusion. It outlines the specifications, sampling procedures, and testing protocols for low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and high-density polyethylene (HDPE). The standard pertains to materials available in granular, pellet, or powder form, ready for application. Its objective is to define and delineate the properties and applications of LDPE, LLDPE, and HDPE materials and compounds, based on fundamental polymer characteristics.

While this standard outlines primary end uses, it does not impose limitations or ensure the appropriateness of a particular grade under specific processing and utilization conditions. It encompasses all polyethylene homopolymers and ethylene copolymers with a content of other 1-olefinic monomers of less than 50% (by mass) and a content of non-olefinic monomers with functional groups of up to 3% (by mass). However, this standard does not cover masterbatches or PE-UHMW (Ultra-high molecular weight polyethylene).

The designation code for LDPE/LLDPE/HDPE and compounds should be formulated using four and five data blocks, respectively. Data Block 1 represents the Indian Standard, Data Block 2 identifies the material, and Data Block 3 specifies the intended application or processing method, including any performance additives and supplementary details provided by the manufacturer for the buyer's reference. Data Block 4 includes designatory properties such as MFI and density. Manufacturers must declare each designation code they intend to include within the scope of the license in their application for license consideration and any changes to the scope of the license.

The material must be uniform throughout and devoid of any foreign substances. Density and melt flow rate, or melt flow index, are the essential properties that must be evaluated for low-density polyethylene, linear low-density polyethylene, high-density polyethylene, and their respective compounds.

TESTS

The subsequent test must be conducted for Polyethylene Material for Moulding and Extrusion.

1. Type Tests (Product Approval)

• Density

• Melt flow rate or Melt flow index

2. Acceptance Tests(Product Identification)

The Standard Mark (ISI Mark) must be visibly displayed on every bag and unit package, ensuring compliance with the specified requirements. Packing should be carried out according to the mutually agreed terms between the purchaser and supplier, with each bag or unit package labeled as per the standard's specifications. Manufacturers must acquire a BIS license from the Bureau of Indian Standards to utilize the standard mark (ISI Mark), which is granted following a thorough assessment of manufacturing infrastructure, quality control, testing capabilities, and production processes.

PROCESS FOR BIS ISI MARK CERTIFICATION