Our other sites:

What are pipe-cleaning brush bristles made of?

Shop for Pipe Cleaning Brushes

Nylon

Nylon is a thermoplastic which can be melted into fibres or 3D objects like bristles for a pip cleaning brush (AKA tube, spiral or twisted brush) Nylon is a thermoplastic used in numerous industries. Thermoplastics melt when heated, allowing them to be reshaped. When they cool down, they re-harden in the new shape.
Pipe cleaning brush (AKA tube, spiral or twisted brush) with nylon bristles. Pipe-cleaning brush bristles made using nylon are soft and flexible while still being resistant to damage by fungi, abrasion and many chemicals. They are suitable to clean and process wood, plastic and metal.
Representation of chemical structure of polyamide nylon which can be made into pipe cleaning brushes (AKA tube, spiral, twisted brushes) In chemistry, nylon is known as a man-made aliphatic polyamide. You may see this abbreviated to ‘PA.’ PA, polyamide and nylon are all the same material.
Wonkee Donkee says 'First produced in 1935, nylon was originally used to make toothbrush bristles and women's stockings'

Polypropylene

Thermoplastic polypropylene resin ready to be used to make products such as pipe cleaning brush bristles (AKA tube, spiral or twisted brushes) Polypropylene is also a thermoplastic. It has similar properties to nylon but is cheaper and easier to produce.
Polypropylene bristles of pipe cleaning brushes (AKA tube, spiral or twisted brushes) are resistant to many chemicals It is resistant to many chemicals and lasts a long time if it is looked after correctly.
Exposure to heat degrades polypropylene pipe cleaning brush bristles AKA tube brush, spiral brush, twisted brush Exposure to heat or ultraviolet light causes it to degrade so it is not suitable to clean hot surfaces.

Abrasive filaments

Abrasive filaments are made of plastic and grit to make bristles like that on some pipe cleaning brushes (AKA tube, spiral or twisted brush) Polypropylene and nylon can be mixed with a gritty material to make flexible bristles which are abrasive along the whole of their length, allowing efficient cleaning right into all recesses in the part to be cleaned.
Aluminium oxide and silicon carbide are two materials used as grit in abrasive filaments for pipe cleaning brushes (AKA tube, spiral or twisted brushes) Aluminium oxide or silicon carbide can be used as the abrasive material because both are very hard, abrasive, crystalline materials.
Different sizes of aluminium oxide grit used in abrasive filaments for pipe cleaning brushes (tube, spiral or twisted brushes) The plastic makes up the main structure of the bristle while the abrasive material (known as ‘grit’) is set into it.  This means the grit size can be varied. The larger the size of the grit, the rougher the surface of the bristle.
Indicating the grit size of aluminium oxide as an abrasive for abrasive filaments used in pipe cleaning brushes (AKA tube, spiral or twisted brushes) Grit size is indicated by a number in the product description. Most UK products use the Federation of European Producers of Abrasives (FEPA) standard which is sometimes indicated by a ‘K’ before the number. The lower the number, the larger the size of the grit.
Abrasive bristles for pipe cleaning brushes (twisted, spiral or tube brushes) can be made flat or round because the thermoplastic can be shaped to any shape. Abrasive filaments can be round or flat. Flat filaments have a larger surface area so are more abrasive, last a long time and are useful for removing lots of material from the surface of your pipe.
Round abrasive filament bristles for pipe cleaning brushes (AKA tube, spiral or twisted brushes) are more flexible than flat bristles Round filaments are the most common and are more flexible than flat filaments.

Stainless steel

pipe cleaning brush bristles can be made from stainless steel. AKA tube brushes, spiral brushes, twisted brushes Stainless steel is an alloy (a material made from two or more chemical elements) containing mainly iron. Different amounts of chromium, silicon, nickel, carbon, nitrogen and manganese are added to the iron to change how it can be used.
Mixing elements to make stainless steel alloy creates different properties so it can be made into pipe cleaning brush bristles AKA tube brush, spiral brushes, twisted brushes Adding chromium increases the steel’s resistance to rusting while adding more nitrogen allows the steel to be made into wire bristles without breaking. There are 57 standard alloys of stainless steel. They will all have a chromium content of 12%-20%.
Pipe cleaning brushes (AKA tube, spiral and twisted brush) with stainless steel bristles can be used in power tools Stainless steel bristles are tough, abrasive and resistant to high temperatures so can be used on hot objects or in a power tool.
Stainless steel does not rust when wet so pipe cleaning brushes can be used on wet surfaces AKA tube brush, spiral brush, twisted brush They can also be used safely when wet and are resistant to some acids and bleach.
Stainless steel will rust if contaminated with other metals. If you want to clean a stainless steel pipe or fitting, it is essential a non-ferrous metal (a metal that doesn’t contain iron) or a stainless steel brush is used. Plastic and brass bristles would be suitable.  Ferrous metal bristles can leave behind tiny pieces of bristle on the surface of the pipe, which can lead to corrosion.

Carbon steel

Carbon steel is an alloy of carbon and iron elements.  It can be used to make lots of things including pipe cleaning brush bristles AKA tube brush, spiral brush Carbon steel is an alloy of mainly iron and carbon.
Carbon steel is very strong and makes long-lasting pipe cleaning brush bristles AKA tube brushes. spiral brushes, twisted brush. Increasing the amount of carbon makes the steel harder and stronger but less easy to form into bristles.
Tempering steel requires heating it up and letting it cool slowly.  This allows it to be made into bristles for pipe cleaning brushes (AKA tube, twisted or spiral brushes) Tempering, a process of heating and slowly cooling, softens high carbon steel allowing it to be formed into wire for bristles.
Carbon steel bristles on a pipe cleaning brush (AKA tube, twisted or spiral brush) Carbon steel is cheaper to produce than other metals but still makes quality, long-lasting, stiff bristles for general cleaning, deburring and preparation of the surface of most metals.

Brass

Brass pipe cleaning brush bristles are softer than other metals and can be used on non-ferrous metals AKA tube brush, spiral brush, twisted brush Brass is an alloy of copper and zinc.
Aluminium increases brass' ductility and decreases corrosion of pipe cleaning brush (AKA twisted, spiral or tube brushes) brass bristles Adding a small amount of aluminium makes brass easier to make into bristles and less likely to corrode.
Brass bristles of pipe cleaning brushes (tube, twisted or spiral brushes) are best on non-ferrous metals.  Brass bristles are softer than stainless steel and are designed to be used on non-ferrous metals.
Bleach can be used with pipe cleaning brushes (AKA tube, twisted or spiral brushes) with brass bristles. Brass bristles can be used with water and mild bleach.
Wonkee Donkee says: 'The manufacturer will be able to  give more information on what metals  are in their alloy of steel or brass.'

Titanium

Titanium can be made into pipe cleaning brush (AKA tube, spiral, fitting brush) bristles. Titanium is a lightweight, strong metal which doesn’t corrode in salt water, chlorine or strong acid.
Galvanic corrosion occurs when two metals react with each other and degrade. It is harder to find on the market than the other metals but, for the same reason as stainless steel (see above), it is essential that titanium objects are cleaned with pipe-cleaning brushes that have titanium bristles to prevent galvanic corrosion.  Galvanic corrosion occurs when two metals of opposite electrical charges touch each other.

Natural fibres

Bristles for pipe cleaning brushes (AKA tube, twisted, bottle or spiral brushes) can be made from palm trees and hogs. Although cheaper-to-make synthetic fibres have mostly replaced natural fibre bristles, they are still available.
Mexican agave plants produce tampico bristles for pipe cleaning brushes (AKA bottle, tube or twisted brushes) Bristles can be made from plants such as palms or agave (a plant unique to Mexico). They are suitable for working on wood surfaces.
Tampico bristled pipe cleaning brush (AKA tube, bottle or twisted brush) are good for cleaning wood. Tampico forms very fine, soft to medium-stiff bristles that polish surfaces, absorb and release water very easily and can withstand temperature extremes and acids.
Pipe cleaning brushes (AKA tube, bottle or spiral brushes) with tampico fibres are antistatic making them perfect for cleaning dry materials. Tampico fibre does not collect dust and lasts for a long time without becoming brittle.
Pipe cleaning brushes with natural fibres are more expensive than synthetic fibres. It is quite expensive and is often replaced with the cheaper polypropylene which can be made a similar stiffness but does not have the same water absorbing properties (see above).
Horsehair is the most common animal fibre used for pipe cleaning brushes (AKA tube, spiral or twisted brushes) Animal fibres, such as horsehair, can also be used to make pipe-cleaning brushes.
Horse hair for pipe cleaning brushes (AKA tube, spiral or twisted brushes) comes from the tail or mane of the horse. Horse hair, taken from the tail or mane, creates a soft bristle for gentle dry polishing or dust removal. It is anti-static so it doesn’t collect dust. It will become damaged in acid or alkaline conditions.
Nylon is more commonly used than horsehair to make pipe cleaning brushes (AKA tube, spiral, bottle, twisted brushes) These days nylon is more commonly used but horsehair is the more gentle bristle.