What is the two basic types of foam?

Protein foams contain natural proteins and are generally biodegradable; synthetic foams are made of synthetic foaming agents.

What are two types of foam?

How many basic types of foam are there?

There are eight different types of foams on the market to choose from, and all will do various jobs. Here we will discuss Class B AFFF (Aqueous Film Forming Foam) and AR-AFFF (Alcohol-Resistant Aqueous Film Forming Foam), which seem to be the most widely used throughout the industry.

How many basic types of foam are there quizlet?

foam solution. 7. How many basic types of foam are there? 8.

What is the type of foam system?

Firefighting foams are available in three types and can be classified as being low, medium or high expansion, depending on the expansion ratio of the solution and air mixture of the various foam-generating equipment, with respect to the liquid phase generated by the mixing systems.

Comparing Foam Types

What is in AFFF foam?

Aqueous film forming foams (AFFF) are water-based and frequently contain hydrocarbon-based surfactant such as sodium alkyl sulfate, and fluorosurfactant, such as fluorotelomers, perfluorooctanoic acid (PFOA), or perfluorooctanesulfonic acid (PFOS).

What is AFFF foam used for?

Aqueous film forming foam (AFFF, or alcohol resistant AR-AFFF) is a highly effective foam used for fighting high-hazard flammable liquid fires. AFFF is usually created by combining foaming agents with fluorinated surfactants.

How many types of firefighting foam are used in portable extinguishers quizlet?

There are three types of portable foam proportioners - low-, medium-, and high-pressure eductors.

What type of foams are also called high expansion foams?

SYNTHETIC/DETERGENT (High Expansion) FOAM CONCENTRATE: Normally used at a concentrate rate between 1.5% to 2.5%, this type of foam concentrate is manufactured from a combination of hydrocarbon surfactants and solvents.

What are the 2 main types of polyurethane foam?

Polyurethane foam is divided into two basic types — open-cell and closed-cell. The former is intended for indoor use, particularly for insulating walls and roofs as well as increasing acoustic comfort of a room, as polyurethane foam — besides thermal insulation properties — has a very high noise reduction coefficient.

What is the most basic type of foam proportioner?

fog nozzle eductor. A. It is the simplest method of proportioning foam.

What is conventional foam?

Conventional foam mattresses are good for all around comfort and support. The foam is both soft to give you maximum comfort, yet firm enough to promote proper support for your body.

Which is the best type of foam?

Latex foam is one of the most durable types of foam available. Latex mattresses and mattress toppers long outlast those made with memory foam and polyurethane foam.

What are the different examples of foam?

Examples of foams formed by gases in liquids include whipped cream, fire retardant foam, and soap bubbles. Rising bread dough may be considered a semisolid foam. Solid foams include dry wood, polystyrene foam, memory foam, and mat foam (as for camping and yoga mats).

What is foam material?

Foam rubber (also known as cellular, sponge, or expanded rubber) refers to rubber that has been manufactured with a foaming agent to create an air-filled matrix structure. Commercial foam rubbers are generally made of synthetic rubber, natural latex or polyurethane.

Which type of foam is effective on polar solvents?

Alcohol-Resistant (AR) foam is a combination of synthetic stabilizers, foaming agents, fluorochemicals, and synthetic polymers designed for use on polar solvents. The chemical makeup of these foams prevents the polar solvents from destroying them.

Which type of foam contains a surface active agent?

Film Forming Fluoroprotein - FFFP: A foam concentrate composed of protein and film forming fluorinated surface-active agents, which makes it capable of forming a water solution film on the surface of a flammable liquid and conferring a fuel shedding property to the finished foam blanket. See also Oleophobic.

What is high expansion foam usually used for?

High Expansion foam is suitable for use in combating fires in buildings, process areas, warehouses, and aircraft hangar systems. High expansion foam systems can be used for protection of LNG storage areas by quickly blanketing the flammable liquid surface and helping to control vapor release.

What is low-expansion and high expansion foam?

Low-expansion foam expands less than 20 times when properly proportioned and agitated with air. The normal expansion range for low-expansion foams is usually 8 to 12 times. High-expansion foam is usually formed by blowing air through a solution-wetted netting or wire mesh.

What is medium expansion foam?

Medium expansion foams are aggregations of bubbles that are mechanically generated by the passage of air or other gases through a net, screen, or other porous medium that is wetted by an aqueous solution of surface active foaming agents.

What is high expansion foam?

High expansion (HI-EX) foam agents, also called detergent foams or multipurpose synthetic foams, are typically based upon fatty alcohols, alkyl sulphates and butyl carbitol. As the name suggests they expand at high ratios to quickly form voluminous foam for specific applications in extinguishing and vapour suppression.

What is class A foam?

There are two major types of firefighting foam, Class A and Class B. Class A foams are used to extinguish fires caused by wood, paper, and brush. Class A foams generally do not contain per- and polyfluoroalkyl substances (also known as “PFAS”).

How many types of fire foam are there?

This standard amalgamates first three parts, namely, Part 1 Protein foam concentrate, Part 2 Aqueous film forming foam (AFFF) and Part 3 Fluoro-protein foam. The purpose of all the three types is same, that is, for use in Fire Extinguishing agent for Class 'A' and 'B' flammable liquid (Hydrocarbons) fires.

What is class B foam made of?

Class B foams can be protein foams or synthetic foams. Protein foams contain natural proteins and are generally biodegradable; synthetic foams are made of synthetic foaming agents.