IS 5158:1987

In this competitive scenario, it isn't easy to survive in the market without a standard quality and certified product. BIS license may also be required to sell products in the Indian market.

To get BIS certification and produce a standard quality product, the manufacturer must ensure that their product must follow the specified Indian standard.

Let's take a closer look at IS 5158:1987 for Phthalic Anhydride, Technical.

IS 5158:1987 covers Phthalic Anhydride, Technical. This standard specifies the requirements and sampling and test methods for phthalic anhydride, technical, suitable for industrial purposes.

The material may be solid or molten, and it must be in the shape of flakes, pellets, or crystals when solid and free of agglomerates, coloured or stained pieces, and other foreign substances.

When tested according to the method specified, the material must also meet the requirements given in the standard. The manufacturer will ensure that the material is handled and stored safely in accordance with the standards. Because of the material's moderate fire hazard and irritating properties, precaution must be taken when handling it. The material must not come into contact with the skin. Exposure to its vapour, fume, and dust must be kept to a minimum, and safety goggles must be worn to protect the eyes.


The following test shall be carried out as per the method prescribed in this standard.

  • Description
  • Crystallizing point
  • Colour of the molten material
  • Free acidity
  • Maleic Anhydride & other oxidisable impurities
  • Ash
  • Iron
  • Naphthalene

Packing and Marking:

Packing and Marking shall be done in accordance with IS 5158:1987. The Standard mark (ISI Mark) shall be marked on each container of phthalic anhydride; technical provided that the product contained in each container on which this mark is applied meets all of the specification's requirements.

Each container must be labelled with the information as specified in the standard. The Manufacturer must obtain a BIS license from the Bureau of Indian Standards to use a standard mark (ISI Mark). The BIS grants a license based on a successful assessment of manufacturing infrastructure, quality control, testing capabilities, and production process.

Latest QCO for Phthalic Anhydride IS 5158:1987

isi mark


For Detailed Information about the Procedure for BIS ISI Certification


If a product falls under the scope of the BIS Conformity Assessment Scheme, All the manufacturers, importers, and foreign entities must obtain BIS ISI Certification. The Bureau may cancel the License if the product fails to meet certification requirements.

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