Standard Input Output Norms updated, adding chemical, food and plastic SIONs and revising numerous product input allowances. The Public Notice amends the Handbook of Procedures (Vol.2) by updating Standard Input Output Norms, adding new SION entries for Chemical, Food and Plastic products and making numerous sector-specific amendments, corrections and deletions to existing norms, quantities, descriptions and footnotes; it requires compliance with specified input items and documentary conditions under the Handbook framework.