TECH 43080 Study Guide - Final Guide: Butyl Acetate, Median Lethal Dose, Flash Point
7 Jan 2018
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Final Review
• 3 things present for a fire
o Oxygen
o Fuel
o Heat
• 2 categories of hazards
o Physical
o Health
• Define each characteristic of materials
o Flash point- lowest temperature at which a material will generate enough vapor
to ignite in the presence of a source of ignition
o Flame point- lowest temperature at which a material produces enough vapors to
sustain a fire
o Vapor pressure- pressure that vapor will exist on the top of a liquid
o Specific gravity- density of a liquid compared to the density of water
o Melting point- temperature where a solid turns into a liquid
o Viscosity
o Boiling point- temperature at which liquid turns to vapor
o Solubility
o Vapor density- ratio of the density of a vapor to the density of air
o Evaporation rate- volatility of a liquid compared to butyl acetate
• Define each of the following health hazards
o Irritant- reversible effects
o Corrosives- visible destruction of living tissue
o Carcinogen- cause cancer
o Toxic substance-
▪ Ingested
▪ Inhaled
▪ Absorbed through skin
o Neurotoxin- effect nervous system
o Nephrotoxin- effect kidneys
o Hepatotoxic- effect liver
• Stel- short term exposure limit
• Tlv- threshold limiting value
• Ld 50- dose to kill 50% of lab animals
• Lc 50- concentration to kill 50% of lab animals
• When picking material for ppe
o Degradation
o Break through
o Steady state permeation rate
• Ladder safety
o Slope 4:1
o Extends 3 feet above walking surface
o Tied off at top and bottom
• Trench safety
o Escape every 25 feet
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