Qualitative Fit Testing

Tests the integrity of a respirator’s seal by determining if the worker can smell or taste a test agent such as saccharin, Bitrex, irritant smoke, or banana oil.

Quantitative Fit Testing

Respirator is worn in a test atmosphere (sometimes a booth) while instrumentation measure any leakage into the respirator.



The energy transmitted by waves through space or some medium. There are two types of radiation: ionizing (X-Rays or radiation from a radioactive device), and non-ionizing radiation (infrared radiation, ultra­violet radiation).

Repetitive Strain Injury

A problem with the muscles, tendons or nerves that happens over time due to overuse. Examples of repetitive strain injuries include: carpal tunnel syndrome and tendonitis.


Plastic ring that holds a cartridge or filter on a respirator.

Rope Grab

Device which attaches to a lifeline and provides a means of arresting a fall.


Offers excellent abrasion, cut, tear, and temperature resistance, as well as great grip. Has poor flame resistance.


Safety Can

An approved container, of not more than 5-gal. capacity, having a spring-closing lid and spout cover designed to safely relieve internal pressure when subjected to fire exposure.

Safety Cuff

Loose fitting, 2 ½” cuff allows glove to slip off if it becomes entangled.

SCBA (Self Contained Breathing Apparatus)

Supplied air system in which the air is supplied from a tank carried by the user.

Sealed Seam

Produced when materials are lapped and then thermally welded to produce a strong, tear-resistant seam. There are no fillers, sealants, bindings thread, or needle holes.


Safety Equipment Institute.

Self-Retracting Lifeline

Decelerating device which allows freedom of movement. Extends and retracts with the worker. Locks when fall occurs.


A substance which on first exposure causes little or no reaction in humans or test animals. However, on repeated exposure, it may cause a marked response not necessarily limited to the contact site.

Serged Seam

Has 3 threads interlocked around the raw edges of material. For low hazard protective clothing.

Shade #

Refers to a lens which intercepts rays of light. Different shade #’s are used in applications such as welding.


Provides extra arch support in shoes and boots.

Shock Absorber

Allows dissipation of energy by extending the deceleration distance to reduce the fall arrest force.

Shoulder Split Leather

More economical than side split. Visible texture difference.

Side Split Leather

Most durable split leather. Provides the greatest protection.


Strongest cut and burn-resistant fiber available (same term as Dyneema).

Static Electricity

An electrical charge that cannot move. This charge will eventually develop enough energy to jump as a spark to a nearby grounded or less highly charged object. If sparks occur in an ignitable vapor or dust mixture, it can cause an explosion or fire.

Supplied Air

Breathable air supplied to a worker’s mask/hood from a source outside the contaminated area.

Supported Glove

Has a cloth liner for added comfort, support, sweat absorption, and wear.



A liquid (usually solvent-based) that is used to dilute paint, varnish, cement or other material to a desired consistency. Most thinners are flammable.


Connect to an anchorage point.


Tungsten Inert Gas. A form of welding.

TLV (Threshold Limit Value)

An estimate of the average safe airborne concentration of a substance that workers may be exposed to day after day without adverse effect.

Toxic Substance

Any substance that can cause acute or chronic effects to a person or is suspected to cause disease or injury under certain conditions.

Type 1 Safety Can

Dispense and fill from a single opening.

Type 2 Safety Can

Has fixed nozzle and separate openings (except for the Uno can by Justrite) for dispensing and filling for a higher level of safety.


UL (Underwriters laboratories)

An independent organization which operates laboratories to investigate devices and materials for potential hazards.

Unsupported Glove

Gloves without any type of fabric lining.

USDA (United States Department of Agriculture)

Monitors and meat and poultry facilities for proper handling and packaging.


Ultra Violet.



Gaseous form of substances which are normally in the solid or liquid state at room temperature and pressure.


Red lens especially for indoor use to enhance contrast. Protects from fluorescent and halogen light glare.


The back and forth motion of an object (for example, tool, machinery or other piece of equipment) that occurs in a predictable pattern or manner. Over-exposure to vibration can harm a part of the body (for example, the fingers) or it can affect the whole body.


Abrasion-resistant, synthetic polymer that resists some acids, oils, fats, caustics, and petroleum hydrocarbons.


Most chemical-resistant of all the rubbers. Protects against PCBs and most solvents. Offers excellent resistance to gas and water vapors, but offers minimal resistance to cuts or abrasions.


The tendency or ability of a liquid to quickly vaporize into the air. Examples of volatile liquids include alcohol and gasoline. Liquids that are volatile must be carefully dispensed and stored. This includes paying special attention to temperature.