Black Onyx Oxide

Black Onyx Oxide (1kg)

Price range: $17.30 through $153.70 Inc GST

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Black Onyx Oxide (1kg)

Introducing the MACt Onyx Oxide, the newest addition to our range of iron oxide pigments. This deep, dark black pigment is a game-changer for anyone looking to achieve true black in GFRC products. In the past, achieving a true black in GFRC was challenging due to the limitations of available pigments, but with MACt Onyx Oxide, you can now achieve the perfect, pure black that you’ve always wanted.Black iron oxide is one of the most commonly used pigments in the concrete industry. Iron oxide pigments are a versatile and widely used colouring agent, thanks to their natural durability, non-toxicity, and excellent lightfastness. These pigments are created by processing natural iron ores in a high-temperature furnace, which converts them into a powder form that can be used as a colouring agent.In GFRC, black iron oxide pigments are used to colour the concrete matrix. They work by absorbing and reflecting light, which creates the desired colour. These pigments are highly concentrated, so only a small amount is required to achieve the desired colour. GFRC manufacturers often use black iron oxide pigments to create a range of products such as countertops, sinks, and facades.MACt Onyx Oxide is the darkest black oxide that we have ever produced. It is highly concentrated, so only a small amount is required to achieve the desired depth of colour. This pigment is perfect for those who are looking to create a bold and striking look in their GFRC products. With MACt Onyx Oxide, you can now achieve a truly black look, without having to settle for a grayish shade that was previously the case with other black pigments.In addition to GFRC, black iron oxide pigments can be used in a variety of applications such as paint, plastic, and even cosmetics. Due to their non-toxic nature, they are commonly used in products that come into contact with the human body, such as lipstick and eye shadow.When working with MACt Onyx Oxide, it is essential to take proper safety precautions. Always wear gloves, protective clothing, and a mask to avoid inhaling the pigment. Ensure that the pigment is well-mixed before use and that it is evenly dispersed throughout the mix to avoid any clumping or uneven colouring.MACt Onyx Oxide is easy to use and mix into your GFRC mix. Simply add the pigment to the mix and mix it thoroughly to ensure that it is evenly dispersed. The amount of pigment that is required will depend on the desired depth of colour. It is essential to start with a small amount and add more as needed to avoid over-colouring your mix.In conclusion, MACt Onyx Oxide is a must-have for anyone looking to create true black GFRC products. Its deep, dark black colour provides an unparalleled look that was previously impossible to achieve. Black iron oxide pigments are a versatile colouring agent, and MACt Onyx Oxide is no exception. With this pigment, you can create a range of bold and striking GFRC products that are sure to make a statement. When using MACt Onyx Oxide, always take proper safety precautions, and remember to start with a small amount and add more as needed to achieve the desired depth of colour.

Additional information

Weight1 kg
Dimensions30.5 × 20.5 × 3 cm
Weight

10KG, 1KG, 25KG

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We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.
To start a return, you can contact us at sales@mact.au
Please note that returns will need to be sent to the following address:
Unit 3C, 919-925 Nudgee Road, Banyo, QLD, 4014, Australia
If your return is accepted, we’ll send you instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted. Please note that if your country of residence is not Australia, shipping your goods may take longer than expected.
You can always contact us for any return questions at sales@mact.au

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Got any question?

Browse through our frequently asked questions to find answers on everything from mould preparation and casting techniques to finishing and long-term maintenance.

Australia’s warm and, in many regions, coastal climate necessitates adjustments during manufacturing. High temperatures can accelerate hydration, so controlled curing environments—such as covering pieces with plastic to retain moisture—are essential. Additionally, lower water-to-cement ratios and carefully selected admixtures help mitigate rapid evaporation and ensure that GFRC develops its designed strength and durability.

Manufacturers address these challenges by:

  • Using precision mixing equipment to achieve a uniform blend and ensure proper fibre distribution.
  • Fine-tuning spray parameters (such as pressure, nozzle design and technique) to avoid voids, pinholes and surface defects.
  • Regular maintenance of equipment and continuous operator training.
  • Adjusting admixture dosages as required to optimise workability and adhesion.

Future trends include increased automation—such as robotic spraying and digital mould design—as well as a greater focus on sustainable practices (e.g. incorporating recycled materials and eco-friendly admixtures). Advances in fibre treatment technology and computer-aided manufacturing are enabling more complex, custom-designed panels. Ongoing research is continually refining mix designs and curing methods to better suit Australia’s diverse environmental conditions.

GFRC is a composite product that combines high‐quality cement, fine aggregates, polymers and alkali‐resistant glass fibres – all premixed to the correct proportions. Its high strength‐to‐weight ratio, durability and capacity for being cast in thin, custom shapes make it ideal for creating stylish and long-lasting benches and tables for both indoor and outdoor use.

GFRC manufacturers must comply with Australian building codes and standards relating to precast concrete, structural performance and safety. This means that production processes, material testing and installation methods are stringently monitored and documented. Close collaboration with local certifying bodies ensures that GFRC products meet all necessary performance and regulatory requirements.

With our premix product, all the ingredients are already proportioned for optimal strength and workability. This means you can focus on preparing your moulds and executing a neat cast rather than measuring raw materials.

Moulds for benches and tables can be constructed from high-density foam, melamine, or even silicone for more intricate designs. It is essential that the mould is smooth, watertight and well supported. Pre-treat the interior with a quality release agent to ensure that the cured GFRC can be removed cleanly.

Typical additional admixtures levels for a 20kg:

  • Water: 2.78L–3.0L
  • Plasticiser: 10g – 50g
  • Fibres HD: 50g-300g
  • Fibres Bundled: 400g-700g
  • Retarder: 5g-20g
  • Accelerator: 5g–20g
  • Defoamer: 1g-3g
  • Colour: up to 800g

*NOTE: All admixes will alter the way the mix behaves.

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