Plastic Square Tubing

Plastic square tubing

As well as round plastic tubing we also offer a selection of plastic square tubing. Plastic square tubing is a type of tube or pipe which is square in shape rather than round. Plastic square tubing has four outer walls with a hollow area inside those walls. Therefore it is not solid throughout the product. If you require a solid square extrusion please take a look at our 27mm square profile.
We have 10 different sizes of plastic square tubing available on our online shop. Each of these 10 sizes are available in either white or black, resulting in a total range of 20 square plastic tubes. For plastic square tubing in other colours you are welcome to contact us for a quote for custom production.
Plastic square tube is available to purchase in packs of 75 metres, there are 25 lengths of 3 metres in each pack. The material used to manufacture our square tubing is rigid PVC. PVC square tube is made using an external grade of plastic, which means it can be used for both outside and inside projects. Each square PVC tube is produced with consistent wall thickness and clean, smooth edges. The external grade PVC offers reliable performance in indoor and outdoor environments without the need for additional coatings.

Features of our plastic box section

Our plastic box sections are made from external grade uPVC, do not contain plasticisers, are easy to cut, and maintain their square shape throughout their length. They are suitable for a variety of uses such as spacing, protective housings, and alignment components. All products are supplied from stock and shipped directly from our UK factory.

What is a square tube called?

Square tube is also known as plastic box section, plastic box profile and square pipe. The word ‘section’ is another name for ‘profile’ which is also an extrusion. Square tubing has four outer walls with a hollow space in the middle, therefore it is not solid throughout. These terms plastic square tubing, plastic box section, and square PVC pipe all describe the same type of extruded profile.

Applications for plastic square tubing

Although round plastic tubing is the most often used type of PVC tube or pipe, there are certain situations where square or rectangular tubing is preferred. Plastic square tubing is used across a wide range of industries and applications, often in ways that vary from project to project. Because of this, we do not always know the exact end use of every order. Customers use these profiles in many different ways depending on their own requirements. Many of our customers use plastic square tubing and rectangular tubing for framing, cable applications and projects requiring a spacer. Another popular use is for the growing hydroponics industry, which involves growing plants without soil. 
If you would like to check whether square, rectangular or round tubing is more suitable for your project please get in touch with us to request samples which we can send you free of charge.

How our plastic square tube is measured

Our plastic square tube is measured externally, which means the profile is measured externally rather than internally. So it is not measured from within the hollow area, it is measured from the outer edges of the shape. The first dimension is the external depth of the square PVC pipe. The smallest square tubing measures 13mm externally, and the largest measures 60mm externally. The second dimension is also the external depth. The third measurement is the thickness, which is offered in 1mm, 1.5mm and 3mm depending on the size of the external depth of the plastic square tube.

A variation - rectangular plastic tube

Square plastic tubing is the most frequently asked for shape for this type of PVC profile. However sometimes a square shape is not suitable. Therefore we also offer 5 different sizes of rectangular plastic tube. For these, the first two dimensions are not the same number which indicates that they are rectangular in shape.
The smallest of our rectangular square tubing is BOX 11mm x 6mm x 1mm and the largest size is BOX 50mm x 25mm x 3mm. Each of these 5 sizes are available in either white or black, making a range of 10 square plastic tubes in total. Rectangular tubing offers similar functionality to square sections but provides more flexibility in fitting or design where asymmetrical coverage is needed.

uPVC Rectangular Section

Our rigid plastic profiles are manufactured from an unplasticised polyvinyl chloride grade of material. This is often referred to as uPVC and is suitable for using outside. This term is widely used in the double-glazing and window industries, where additional stabilisers are often added to the uPVC, which are not used on our uPVC products. Our range of uPVC plastic square box section includes some uPVC rectangular section. The smallest is 11mm x 6mm x 1mm, and the largest is 50mm x 25mm x 3mm. These are rectangular in shape rather than square. uPVC rectangular tube is sold in 75 metre packs, each containing 25 x 3 metre lengths. If you are not sure whether uPVC rectangular section is suitable for your project please request a sample to check. All our (u)PVC profiles are extruded in-house in our UK based factory, ensuring consistent finish and reliable quality for repeat orders.

Ordering and delivery information

All standard plastic square tubes are sold in full packs of 75 metres. We manufacture plastic square tubes in our British factory and because we work around the clock we can provide a fast delivery service to mainland Britain. Our production processes are designed to maintain consistent stock levels, and new batches are quickly produced when required, so products are rarely out of stock. Each pack includes 25 pieces at 3 metres long, securely packaged for transport. 

Also known as square PVC pipe

When searching online, plastic square tubing is also known under several other names. This is because another word for tube or tubing is pipe.  Other common terms include square PVC pipe, plastic box section and square plastic tube. These names are all referring to the same square or rectangle hollow plastic extrusion.
If you are looking for square PVC pipe our range may offer you a solution. The largest size of square PVC pipe we manufacture is 60mm. So for larger sizes we recommend you contact a roofing or conservatory company who specialise in the larger sizes of square plastic pipe. Our square PVC pipes are manufactured in the UK and supplied directly from our factory to ensure accurate dimensions and batch consistency.

Plastic box section – another name

The word ‘section’ is another name for ‘profile’ which is also an extrusion. Some people refer to plastic square tubing as plastic box section, it means the same thing. Plastic box section can be used in external situations so this product is sometimes referred to as uPVC plastic box section of uPVC square tubing. This is because it is manufactured using an external grade of PVC which is unplasticised.
So if you are looking for plastic box section, square PVC pipe or plastic square tube we might be able to offer you a solution. Please get in touch to request free samples which we can send you by post. 

You can also view related plastic extrusions in our shop, including plastic channels, flat strips, and angle trims available in matching colours and sizes.

Custom extrusion options

If the size or wall thickness you require is not listed in our standard range, MKM Extrusions can manufacture a custom plastic square or rectangular profile. Custom production allows for alternative colours, materials, or dimensions. Minimum runs are typically 2000 metres, depending on the size and complexity of the die.

Plastic square tubes – made in Britain

We manufacture plastic square tubes in our British factory and because we work around the clock during the week can provide a fast delivery service to mainland Britain. For orders placed before 4pm you should receive the goods the next working day if they are in stock. If they are out of stock we can quickly manufacture more plastic square tubing which should be delivered to you in three clear working days all being well with the carrier company. The timescale for delivery is indicated on the checkout page of our online shop and on your order confirmation email. For some of the more remote postcodes, including offshore islands, an extra few days will be added to the delivery timescale.
We are a member of Made in Britain where you can view our listing with them. We are proud of our customer reviews which you can see on Trustpilot. Every plastic square tube or box section is made in the UK under controlled conditions using UK-sourced PVC compound.
We produce high-quality plastic square tubing and are accredited with BS ISO 9001:2015 for quality and BS ISO 14001:2015 for environmental management. Each extrusion run for all of our plastic profiles is monitored to maintain dimensional accuracy and a quality finish.