What types of substances should be used under a fume hood?

Applications. Fume hoods: Chemical fume hoods can be used to handle the following: odorous materials, toxic gases, reactive materials, chemicals that can spatter, aerosols, carcinogens, flammables or other toxic and volatile materials.

What is a fume hood used for?

A chemical fume hood is a ventilated enclosure used to trap and exhaust vapors, gases, and nanoparticles. The exhaust fan is typically stationed at the top of the building and pulls air through the duct work connected to the hood and exhausts it into the atmosphere.

Why must you use a specific type of fume hood for perchlorates?

Using a proper perchloric acid fume hood with a wash-down system is imperative in preventing inadvertent contact with incompatibles and the formation of perchlorate salts. Perchlorate salts are highly explosive and sensitive to shocks and vibrations, including the normal working vibrations of a fume hood.

What type of substance should be handled in a fume cupboard?

Work with substances that produce/generate toxic or harmful fumes, vapours, gases, dust or chemical aerosols, should be carried out in a fume cupboard in order to eliminate or reduce the risk of exposure to an acceptable and safe level.

What is a fume hood made of?

Definition. A fume hood, technically a laboratory chemical hood, is a type of local exhaust ventilation system (engineering control). A typical fume hood is cabinet with a moveable front sash (window) made out of safety glass.

Which is the best use for a fume hood quizlet?

A fume hood is used to prevent toxic vapors from getting into laboratory air. The fume hood should be used if one is using chemicals that have inhalation warnings.

Are chemical fume hoods HEPA filtered?

A chemical fume hood protects the user while a biosafety cabinet protects the user, the environment, and the material. Biosafety cabinets have high-efficiency particulate air (HEPA) filters while chemical fume hoods do not.

What is perchloric acid used for?

Perchloric acid is used to separate potassium from sodium, and in many laboratory tests and industrial processes. Uses for the salts of perchloric acid include explosives and plating metals. Perchloric acid may explode, and it decomposes on heating producing toxic and corrosive fumes.

Why can’t you use perchloric acid in a fume hood?

At elevated temperatures, vapors from perchloric acid can condense on surfaces in the ductwork of the hood, where they form perchlorate salts that are often highly shock-sensitive and that pose a serious explosion hazard.

What is not suitable for working in a fume hood?

Equipment and materials placed in the hood must not block hood slots, airfoils, or otherwise interfere with the smooth flow of air into the hood. Never place or use equipment that protrudes beyond the face of the hood (sash opening).

How does a chemical hood work?

A fume hood is a ventilated enclosure in which gases, vapors and fumes are captured and removed from the work area. An exhaust fan situated on the top of the laboratory building pulls air and airborne contaminants through connected ductwork and exhausts them to the atmosphere.

What are chemical fume hoods?

Chemical fume hoods are the most essential engineering control in a lab. They provide users with protection against vapors, gases, or dusts given off by hazardous materials used in the lab.

What is a perchloric acid fume hood?

Perchloric Acid – This type of hood is designed specifically for the use of perchloric acid. Perchloric acid vaporizes when heated above ambient temperatures. This can create explosive perchlorate crystals to form within the ductwork of a conventional fume hood.

What chemicals should not be used in a fume hood?

Certain chemicals used in large quantities such as perchloric acid, hydrochloric acid, and hydrofluoric acid should not be used in a chemical fume hood that is not approved for their use. Radioactive materials should only be used in chemical fume hoods if certified by the Radiation Safety Office.

What type of fume hood should you invest in?

Most hoods also include spill-containment features, which can be especially important when working with exceptionally hazardous materials. Whether you work on personal projects or in a lab, it’s important to determine what type of fume hood you should invest in. 1. Bench-top Fume Hood