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The twelve categories

Hazard communication and safety data sheets

Compiled by the Sitonce editorial team from the PSI Candidate Information Bulletin, NASCLA's own published material and the federal standards named belowUpdated 2 min readFacts verified 4 September 2026
The short answer

A written hazard communication program, labels carrying six required elements, safety data sheets in a standard 16-section format, and training. The section order is fixed and is examined.

The standard that turns a shelf of chemicals into a documented system, and it has a lot of countable parts.

The four components

  • A written hazard communication program
  • Labels on containers
  • Safety data sheets, accessible to employees
  • Training on the hazards and the system

Label elements

Six required elements: product identifier, signal word, hazard statements, pictograms, precautionary statements, and the supplier's name and contact details.

Two signal words only - Danger for the more severe hazard, Warning for the less severe. Never both on one label.

Safety data sheets

Sixteen sections in a fixed order. The order is the point, because it means anybody can find what they need in any manufacturer's sheet.

SectionContains
1Identification
2Hazard identification
3Composition and ingredients
4First aid measures
5Fire-fighting measures
6Accidental release measures
8Exposure controls and personal protection
Section 4 is the one that matters in an emergency

First aid measures. Knowing the section number without reading the sheet is the entire reason the format is standardized, and it is what a question about a chemical exposure is testing.

Access

Sheets must be readily accessible to employees in their work area during each shift. Locked in a site office nobody can enter is not accessible.

Multi-employer sites

On a construction site with several employers, information about hazards each brings has to reach the others. That coordination duty falls naturally on the general contractor. Know the section.

Common questions

What does the hazard communication standard require?

A written program, labels, safety data sheets and training.

How many sections does a safety data sheet have?

16, in a fixed order so anybody can find information in any manufacturer's sheet.

Which section covers first aid?

Section 4.

What are the label elements?

Product identifier, signal word, hazard statements, pictograms, precautionary statements, and supplier contact details.

What are the signal words?

Danger for more severe hazards and Warning for less severe. Never both on one label.