CHST - Construction Health and Safety Technician Hazardous Materials and Chemical Safety Questions and Answers Flashcards

Under OSHA's Hazard Communication Standard (HazCom 2012), how many sections are required in a Safety Data Sheet (SDS)?

Answer: 16 sections

OSHA's HazCom 2012, aligned with GHS, mandates a standardized 16-section format for all Safety Data Sheets.

A construction worker is exposed to isocyanate-containing spray foam. Which type of respirator provides the MINIMUM required protection during application?

Answer: A supplied-air respirator (SAR) in positive-pressure mode

Isocyanates are highly sensitizing; OSHA and NIOSH recommend supplied-air respirators in positive-pressure mode because organic vapor cartridges may not provide adequate protection at low concentrations.

Which NFPA 704 diamond section color indicates health hazard information?

Answer: Blue (left)

The NFPA 704 diamond uses blue on the left quadrant to indicate health hazards, rated 0–4.

A drum labeled with a UN/DOT hazard class 3 placard contains which category of material?

Answer: Flammable liquids

DOT Hazard Class 3 designates flammable liquids, including gasoline, acetone, and similar solvents commonly found on construction sites.

During demolition of a pre-1980 building, workers encounter pipe insulation suspected to contain asbestos. What is the FIRST action the CHST should take?

Answer: Stop work in the affected area and arrange for sampling by a licensed asbestos inspector

OSHA 29 CFR 1926.1101 requires that suspect asbestos-containing materials be assessed by a competent person before disturbance; work must stop until sampling confirms or rules out ACM.

The IDLH (Immediately Dangerous to Life or Health) value for a chemical represents:

Answer: The maximum concentration from which an unprotected worker can escape within 30 minutes without irreversible health effects

IDLH is defined by NIOSH as the maximum concentration from which a worker could escape within 30 minutes without experiencing escape-impairing symptoms or irreversible health effects.

Which document must employers make available to employees and their designated representatives within one working day of a request under OSHA's HazCom standard?

Answer: Safety Data Sheets (SDS) for chemicals in the workplace

OSHA 29 CFR 1910.1200(g)(8) requires that SDSs be readily accessible to employees during each work shift and provided within one working day upon request.