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Strip Brush & Garage Door Seals

What is the difference between 4mm and 9mm Strip Brush?

What is the difference between 4mm and 9mm Strip Brush?

4mm – this is our range of Residential Strip Brush, 4mm refers to the width of the backing that holds the Nylon bristle in place.  Generally this Strip Brush is used for domestic applications, door strips, Garage Door Seals, computer cabling seals, covering gaps under 100mm

9mm – this is our range of Industrial Strip Brush, 9mm refers to the wide of the backing that holds the Polypropylene bristle in place.  Generally this Strip Brush is used for industrial applications, factory roller doors, large sheds, covering gaps larger than 100mm, pest control, conveyor manufacturing solutions, sealing spray booths.

Click here for our 4mm Residential Strip Brush Sample Pack

Click here for our 9mm Industrial Strip Brush Sample Pack

Do I need a holder to fit the Flexi Brush Strip®?

The Flexi Brush Strip has a larger backing which means you can screw or rivet straight into the backing.  The backing size is 25mm x 10mm, allow for 10mm where the bristles are individually staple-punched into the backing.

Click here for our Flexi Brush Strip

 

Why should I purchase a Strip Brush Sample Pack first?

A Sample Pack is the best way to know that you are ordering exactly what you need.
Each sample pack contains a small piece of every Strip Brush option, including the fibre types, bristle length options and aluminium holder shapes.

Mix and match the different brush and track options to figure exactly what you need for your application. Know exactly what you need and have confidence that your strip brush will work the first time.
PLUS, you qualify for a 10% discount off your Strip Brush purchase (excluding Freight)

Click here for our 4mm Residential Strip Brush Sample Pack

Click here for our 9mm Industrial Strip Brush Sample Pack

How much is a Strip Brush Sample Pack?

Our 4mm Residential Strip Brush Sample Pack costs $1.00 including GST, plus Australia Post 500gm Satchel cost.
Our 9mm Industrial Strip Brush Sample Pack costs $9.90 including GST, plus Courier 5kg Satchel cost. This includes the Residential Pack FREE OF CHARGE.

We generally process and ship SAME day as order.

Click here for our 4mm Residential Strip Brush Sample Pack

Click here for our 9mm Industrial Strip Brush Sample Pack

Flue & Chimney Brush Kits and Cleaning

What size flue brush do I need?

For the best clean, choose a Flue Brush Head the same size as the inside diameter of your Flue. a Flue Brush head that is too small will be ineffective; too large may damage the joins and rivets in your Flue.

What is the difference between the Polypropylene brushes and the Galvanised Steel brushes?

Our Polypropylene Flue Brush Head is widely recommended for most Flue Cleaning applications. The polypropylene bristles are hard wearing, long lasting and strong enough to give you a great clean. However, it can’t be used when the flue is warm, as the plastic can melt.
The Galvanised Steel brush can be used when the flue is still warm. The major disadvantage is that over time the steel bristles may scratch the inside of the flue, leading to more creosote build-up in the future
For personal use we recommend the polypropylene brush head.

Chimney, Flue, Duct or Coffee Roaster Brush - which is my best option

For flues and wood heaters, check out our Flue Brush Range

For chimneys, check out our Semi Professional Chimney Sweep Kit

For Duct cleaning, check out our Professional Brushes

For Coffee Roasters, check out our Coffee Roaster Kits

I don’t want to climb onto the roof. Which brush do I need?

The Flexi Flue Brush Kit is designed to clean from the bottom up. The Nylon rod is strong but flexible and can handle up to 2 x 45-degree bends. This allows it bend through the wood heater into the flue hole.
You will need to remove the baffle or damper plate to access the opening of the flue. Cleaning from the bottom up can be a bit messier, so be on hand with a vacuum cleaner to suck up any soot that overflows from the heater.
Do not try to bend the rod more than 45 degrees when you are feeding the rod into the Flue. You will need to stand close to the front of the woodheater so that you do not run the risk of the Rod being forced inwards at a larger angle and collapsing. If you are unable to remove the Damper plate, you may need to contact your local Wood Heater service professional for advice.

Roof Gutter Brush

How does Roof Gutter Brush work?

When you place the 1 metre lengths of Gutter Brush into your guttering, it can create a barrier so that leaves or other debris will blow off the Gutter Brush and cannot accumulate inside your guttering. Rain can still get through the bristles so that your drainage is not impacted.

How do I choose the size of my Roof Gutter Brush?

You need to measure the width of your guttering.  This will determine the diameter size of the brush you need.

For example, if your guttering measures 120mm x 120mm, go with the 125mm diameter.  The 110mm dia might be too loose and leaves could still fall down the side of the Gutter Brush, so a firmer fit would be recommended.  Sometimes the gutter brush might be visible above the guttering, but as a black bristle brush it is generally not too noticeable.

How do I install Roof Gutter Brush?

Our Gutter Brush is manufactured in 1 metre lengths for convenience of shipping. You simply lay them end to end inside your gutter. You can bend the brush so that it can go around the corners or your guttering.  It can also be pressed under the tiles to help keep out pests.

Lay the Gutter Brush so the ends press into each other, the single pieces will remain in place in your roof guttering.

You can also install a small section of gutter brush in the down pipe to leaves. Bend the rest of the length into the gutter. Only feed a small section, approx. 20cm, into the pipe so it does not impede the flow of water.

How does the Gutter Brush stay in place in my roof guttering?

Lay the Gutter Brush end to the end so the ends of the brush press slightly into each other, the single pieces will remain in place in your roof guttering.

Tube and Wire Brushes

What is the best Extension Rod to use with Boiler Tube Brushes?

We recommend using our Professional Chimney Rods, strong but flexible Polypropylene Rod with Brass fittings and 1/2″ BSW thread. Can be screwed end to end for longer lengths. You will also need to purchase a UA1 Brass adapter which has the 1/2″ BSW fitting.

Click here for our Professional Chimney Rods

Can these brushes be used for Coffee Roaster Flues?

We have a Professional Coffee Roasters Flue Cleaning Kit available that is suited for this application. The heavy duty Boiler Tube brushes have the potential to scratch the inside of the Stainless Steel Flue which can create more creosote build up.  Brass brushes would be more suitable for this application than Steel.  Our Professional Coffee Roasters Flue Cleaning Kit contains heavy duty Polypropylene brush heads suitable for this application.

I need to fit a Brass Condensor Tube brush with a 5/16th fitting to a length of steel rod. How do I braze them together?

Brazing a brass condenser tube brush with a 5/16″ fitting to a steel rod requires proper preparation, the right materials, and careful heating. Here’s how to do it:

Materials Needed:

  • Brass Condenser Tube Brush (5/16″ fitting)
  • Steel Rod (clean and sized appropriately)
  • Silver Brazing Rod (preferably with flux core, or use a separate flux)
  • Brazing Flux (if not using flux-coated rods)
  • Oxy-acetylene torch (or MAPP gas torch for smaller jobs)
  • Wire brush and emery cloth (for surface preparation)
  • Heat-resistant gloves and safety goggles

Step-by-Step Brazing Process:

Surface Preparation:

  • Clean the steel ferrule and steel rod with a wire brush to remove dirt, oxidation, and any surface contaminants.
  • Use wet and dry sandpaper (400-600 grit) or a Scotch-Brite pad to further clean and roughen the surfaces for better adhesion.
  • Degrease both parts with acetone or a suitable solvent.
  • Apply brazing flux to the joint area to prevent oxidation and ensure a strong bond.

Positioning the Parts:

  • If possible, insert the steel rod into the ferrule for a stronger mechanical connection.
  • Secure the assembly using clamps or a fixture to hold it steady.

Heating the Joint:

  • Use an oxy-acetylene torch or MAPP gas torch to heat both the steel ferrule and steel rod evenly.
  • Focus more heat on the rod since it has a larger mass and will take longer to reach brazing temperature.

Applying the Brazing Rod:

  • Once the steel reaches brazing temperature (approx. 800-900°C for brass or silver brazing alloy), touch the brazing rod to the joint.
  • The molten braze material should flow smoothly into the joint by capillary action.
  • Ensure full coverage around the ferrule and rod for maximum strength.

Cooling and Cleaning:

  • Allow the assembly to cool naturally (do not quench). Rapid cooling can weaken the joint.
  • Remove any residual flux with warm water and a wire brush.
  • Inspect the joint to ensure full penetration and strength.

Important Note:

If you are unsure about any part of the brazing process or need a strong, reliable joint for a critical application, consult a qualified welding professional or a boilermaker with experience in brazing steel components. They will ensure the correct materials, temperatures, and techniques are used for a durable bond.

 

Cleaning Products

What is EcoWash?

EcoWash is a Truck Wash detergent. We no longer supply this product.

General FAQs

Can I pick up from store?

Please add your Postcode to your shopping cart and drop down options will appear, including pick up from store.

When you purchase is processed you will be notified of the arrangements to collect your goods.

We have 2 pick up locations:

Busy Bee Brushware – 39 Swift Way Dandenong South

BB Engineering Plastics – Factory 2/31 Swift Way Dandenong South

Do you have a minimum purchase for Sheet or Rod?

On our website, the minimum order is $25 plus GST. We may have smaller diameter rods or thinner sheets available—please Contact us for details and special orders.

What type of machining do you have available?

CNC Cutting and Machining

  • CNC Router Cutting – precision cutting and profiling of plastic sheet from drawing or DXF file
  • Turning (Lathe Work) – machining plastic rod to size, bushes, rollers, spacers and custom components

  • Milling – machining flat surfaces, slots and profiles in plastic sheet or block

  • Drilling – precision hole drilling in plastics

  • Boring & Reaming – accurate internal diameters and finishing holes to size

  • Threading – internal and external threads in plastic components

  • Cut to Size – plastic sheet and rod cut to customer specifications

  • Custom Plastic Machining – one-off or production components

Contact us for help with your specific application.

I live in South Australia, how soon can you get it to me?

At BB Engineering Plastics, we pride ourselves on quality products and fast turnaround.

For cut to size products, we can usually turnaround in 1-2 business day from Order. General courier services take around 3-4 business days to Adelaide and another 2-3 business days for regional areas. Remembering that once it leaves our factory, the delivery is in the hands of the “shipping fairies”(!!) We work closely with our shipping partners, monitoring your goods to ensure it gets to your location at the earliest opportunity.

For urgent Orders, please Contact us so we can check on shipping options for you.

For more custom projects, we will advise you of timeframes at time of quoting.

Engineering Plastic

I need to machine some plastic rod to make some bushes. Where do I start?

Machining bushes from plastic rod is straightforward, but a few steps at the start make the job much easier and more accurate.

1. Choose the right plastic

Start by selecting a material suited to a bush (bearing surface).

Common options:

  • Acetal (POM / Delrin) – excellent for bushes, low friction, machines well
  • Nylon (PA6 / Cast Nylon) – strong and wear resistant but absorbs moisture
  • UHMWPE – very slippery, good wear resistance but softer
  • PTFE – extremely low friction but quite soft

For most general bushes, Acetal is usually the best starting point.

2. Work out the dimensions

Before touching the lathe, define three sizes:

  • OD – outside diameter of the bush
  • ID – shaft size the bush runs on
  • Length

Allowances matter:

  • Press fit housing: OD usually +0.02 to +0.05 mm
  • Running clearance on shaft: ID usually +0.02 to +0.05 mm

Plastic expands more than metal, so avoid tight fits.

3. Cut a blank from the rod

Cut a piece of rod slightly oversize:

  • Length: +2–3 mm
  • OD: already oversized from the rod

A bandsaw works well.

4. Machine on a lathe

Typical order of operations:

  1. Face the end of the rod
  2. Centre drill
  3. Drill undersize (about 0.5–1 mm smaller than final ID)
  4. Bore to final ID
  5. Turn the outside diameter
  6. Part off to length
  7. Light face on the second side

Boring the hole gives much better accuracy than drilling alone.

5. Use the right tooling

Plastic machines differently to metal.

Best practices:

  • Sharp tools
  • High rake angles
  • Moderate speeds
  • Light cuts
  • Avoid heat buildup

If the plastic starts stringing or melting, slow down and reduce feed.

6. Deburr carefully

Plastic burrs easily.

Use:

  • A sharp knife
  • Deburring tool
  • Light chamfer

A 0.5–1 mm chamfer on both sides helps installation.


EXAMPLE

If you need a bush for:

  • 20 mm shaft
  • 30 mm housing
  • 25 mm long

Typical sizes:

  • ID: 20.03 mm
  • OD: 30.03 mm (press fit)
  • Length: 25 mm

Suggested Material: Acetal rod Ø32 mm

We can assist with custom machining, please Contact us for help with your specific application.

 

What is HDPE?

HDPE (High Density Polyethylene) is a tough and versatile plastic that offers excellent impact resistance and chemical resistance. It’s commonly used in applications such as cutting boards, tank linings, and piping systems. HDPE is lightweight, easy to work with, and cost-effective, making it a reliable choice for industries looking for a balance between durability and affordability.

Available in NATURAL (White) and BLACK in sheet and rod. We can get you out of trouble fast with cut to size options.  Contact us now.

I need a piece of plastic that can handle chemicals, what do you recommend?

If the material will be exposed to chemicals, acids, or oils, you’ll need a chemically resistant option like HDPE or PVC.

HDPE comes in NATURAL (White) and BLACK in a range of thicknesses. PVC comes in GREY.  We stock both options.

Contact us for help with your specific application.

 

My client needs food grade plastic for a chopping board. What should I specify?

HDPE (High Density Polyethylene) is a good all round plastic for chopping boards and an economical option. Available in a range of  thicknesses and in colours BLACK and NATURAL (White).

Other food grade options are UHMWPE (Ultra High Molecular Weight Polyethylene) which is available in NATURAL (White) or GREEN.

Talk to us about your project now.

 

Skylight Diffuser Replacements

My existing Skylight Diffuser is broken. How do I measure the size?

Jigsaw time! Arrange the pieces as best you can into shape, then trace or measure your diffuser.
For circles, trace onto paper, then fold the circle in half to find the diameter.

What is the Skylight Diffuser replacement made from?

The Skylight Diffusers are custom cut from 3mm thickness Acrylic Plastic Sheet.  The “colour” is Opal Frost which provides a soft glow.

What if I need a custom size?

Select a larger size, e.g. if you need 460mm, then select a 500mm dia Round. When you go to the Checkout, there is a box available for your comments and you can specify that you require your Diffuser to be 460mm dia Round.

Will the diffuser sag because of the size?

Provided you are fitting your Skylight Diffuser replacement into a solid frame, it is generally strong enough to hold up without sagging.

Polycarbonate UV2 Clear Plastic Sheet

What does UV2 mean in relation to Polycarbonate Sheet?

In relation to polycarbonate flat sheet used for engineering and construction, UV2 generally means:

Two-Sided UV Protection

“UV2” indicates the sheet has a UV protective coating applied to both faces of the polycarbonate.


What that means in practice

Polycarbonate naturally has high impact strength, but it will:

  • Yellow over time
  • Lose clarity
  • Become brittle

when exposed to prolonged ultraviolet (sunlight) without protection.

A UV2 sheet is:

  • Co-extruded or coated with a UV-stabilised layer
  • Protected on both sides
  • Suitable for outdoor applications where either face may be exposed to sunlight

When UV2 matters

UV2 sheets are typically specified for:

  • Roofing and skylights
  • Machine guards exposed to daylight
  • Safety glazing
  • Covered walkways
  • External barriers or shields

If a sheet is marked UV1, it usually means only one side has UV protection and must be installed with the protected side facing outward.


Why it’s important for engineering and construction

UV2 gives:

  • Longer service life outdoors
  • Better clarity retention
  • Reduced cracking and surface degradation
  • More flexibility during installation (no risk of installing the “wrong side” out)

If you’re supplying sheet for outdoor structural or glazing use, UV2 is generally the safer specification.

 

What is the difference between Acrylic and Polycarbonate Sheet?

Here’s a clear, practical comparison between Acrylic (PMMA) and Polycarbonate (PC) sheet:


Strength & Impact Resistance

  • Polycarbonate: Extremely tough (virtually unbreakable). Used for safety glazing and machine guards.
  • Acrylic: Stronger than glass but brittle compared to polycarbonate. Can crack under impact.

If impact matters → Polycarbonate wins


Clarity & Appearance

  • Acrylic: Better optical clarity (up to ~92% light transmission). Looks more like glass.
  • Polycarbonate: Slightly less clear, can have a faint tint.

If appearance matters → Acrylic wins


Scratch Resistance

  • Acrylic: Naturally harder surface, more scratch-resistant.
  • Polycarbonate: Softer, scratches easily (often needs hard coating).

For surface durability → Acrylic wins


Heat & Temperature Resistance

  • Polycarbonate: Handles higher temperatures without deforming.
  • Acrylic: Lower heat resistance, can warp or crack under heat.

For heat → Polycarbonate wins


Machining & Fabrication

  • Acrylic: Easy to cut, polish, and glue with a clean finish.
  • Polycarbonate: Tougher to machine cleanly but very formable (can bend without cracking).

For clean finishes → Acrylic
For bending/forming → Polycarbonate


Cost

  • Acrylic: More affordable.
  • Polycarbonate: More expensive due to performance.

Typical Uses

  • Acrylic: Signage, display panels, shop fittings, light covers
  • Polycarbonate: Machine guards, safety shields, roofing, impact areas

Simple Rule of Thumb

  • Need strength and safety → go Polycarbonate
  • Need clarity and finish → go Acrylic

 

How do you bend Plastic Sheet?

Plastic can be bent in two ways – around a shallow curve or along a sharp corner. When bending a sheet around a sharp corner you will require heat to get the desired radius. With heat bending, you tend to heat the plastic to a specific line or point in the sheet and hold it to the shape.

Plastic sheet can be bent by carefully applying heat along the fold line and shaping it to the desired angle. At Busy Bee, we offer a folding/bending service specifically for Acrylic and Polycarbonate sheets, capable of handling up to 6 mm thickness and lengths up to 1.2 m, ensuring precise, clean bends without cracking or stressing the material.

What can you do/make with plastic bending applications

With plastic bending capabilities, you can create a wide range of functional and custom products. Examples include:

  • Protective panels and guards – bent plastic sheets can be used for machine guarding, viewing panels, or as a lightweight, shatter-resistant replacement for glass.
  • Enclosures and covers – for machinery, electronics, or outdoor equipment where lightweight, durable, heat- or UV-resistant plastics are needed.
  • Signage and displays – folded or bent acrylic or polycarbonate sheets can form stand-offs, holders, or protective display covers.
  • Custom parts and panels – for DIY, industrial, or automotive applications where off-the-shelf shapes won’t fit, including ducting, deflectors, or shields.

At BB Engineering Plastics, our folding/bending table handles Acrylic or Polycarbonate sheets up to 6 mm thick and lengths up to 1.2m, making it ideal for these types of custom solutions.

 

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