Cart $0.00
Subtotal: $0.00

No products in the cart.

No products in the cart.

Instant Brick Castable Cement 4kg


Our Australian Made & Owned Firewise Instant Brick Castable Cement is ideal for replacing or building fireplace bricks.

  • Replaces Firebricks
  • Heat Resistant to 1000°C
  • Interior & Exterior Use

Availability: 92 in stock

Over time bricks surrounding fireplaces and BBQs can crumble and break. It is important to use bricks that are heat resistant. Firewise Instant Brick Castable Cement is a heat resistant air-setting and heat-setting firebrick mix for repairing or replacing firebricks. With exceptional strength and abrasion resistance, Instant Brick Castable Cement is asbestos free and gives off no toxic fumes.

Colour: Grey

in stoves, fireplaces, furnaces and for lining Pot Belly Stoves.

Ideal for:

  • Repairing firebricks
  • Replacing firebricks
  • Cast into whatever shape you need
  • Lining Pot Belly Stoves

Suitable for:

  • Stoves
  • Fireplaces
  • Furnaces

Handy Hint: Use Firewise Hot Spot Ready To Use Mortar to fill in any gaps around the brick.

Note: 4kgs = 1 std size house brick.



How to Use

Empty whole contents of tub into plastic bucket.

  • Add water slowly, mixing with a trowel until a dry crumbly paste is obtained.
  • Add more water SLOWLY until mix is a pliable ball.
  • On a clean flat surface, mould to the size and shape brick required. Trim with a knife if necessary.
  • Clean area to be filled removing any loose material and dust. Then wet the area with water.
  • Place brick in firmly to take up vacant space.
  • Air dry for 24 hours. Then heatset with a small gentle fire. Your unit is then ready for normal use.

Note: 4kgs = 1 std size house brick.

Handy Hint: Use FireWise™ Hot Spot Ready To Use Mortar to fill in any gaps around the brick.

Safety & First Aid

SAFETY DIRECTIONS: Keep all cleaning products out of reach of children. May cause damage to organs through prolonged or repeated exposure. Do not breathe dust, wear dust mask.

FIRST AID: For advice contact a Poisons Information Centre (e.g. phone Australia 13 11 26; New Zealand 0800 764 766) or a doctor (at once). If swallowed, do NOT induce vomiting. If in eyes, hold eyelids apart and flush the eye continuously with running water. Continue flushing until advised to stop by a Poisons Information Centre or a doctor, or for at least 15 minutes. If skin or hair contact occurs, remove contaminated clothing and flush skin and hair with running water.


What temperature is the product effective to?

Is it ok for outside on my brick BBQ?
Yes, protect from rain/moisture for 24 hrs until curing process is complete.

I have broken bricks in my fireplace, am I able to spread this over all of the bricks and fill in the hole?
Yes, as this perfect for replacing and/or repairing fireplace bricks.

Can I use instant brick in a load-bearing wall?
It would be best to use concrete, please consult your local hardware for advice.

Can this be used as a render for my pizza oven?
For this kind of project; yes, as the formula is more suited to be applied in thicker layers. To be used inside only.

Can this product be dyed to suit the colour of my oven bricks?
Yes, however – as this is something we have not tested we are unaware how the dye will react with the heat and whether or not it will fade.

SDS & Documents

Click on the links below to view and/or download.

Where to Buy

Can’t find a product locally? Call or email one of our distributors to see if they supply a store near you or buy direct online from us.
(Note: Some distributors do not stock our whole range)


Australia Wide
S&D Berg

Phone: 03 9890 1634
Email: sales@sdberg.com.au

Phone: 07 3272 9051
Email: ramdexint@tpg.com.au

Customer Reviews

Customer Reviews

Based on 1 review

Without Rubbedin materials keeping a very old Rayburn cooker firebox alive would be almost impossible.

You may also like
Scroll to Top

Subscribe Now and Save 25% off your first order over $50