Understanding the Dangers of Working with Vermiculite

No matter the size of the project or the industry you operate in, you need to be certain your working environment is as safe as possible. While there are many layers to achieving this, one of the most important components is asbestos testing.

Asbestos was used throughout Australia up until the mid-1980s, when research began to show that the material was associated with a variety of serious health conditions. According to Healthdirect Australia, exposure to asbestos may increase the risk of asbestosis, mesothelioma, lung cancer, pleural disease and other types of cancer.

Worryingly, other commonly building materials have been found to contain asbestos. Vermiculite, a durable silicate material, was sold for over 50 years in Australia before research found it had been contaminated with traces of asbestos.

What exactly is vermiculite? Is it dangerous? And how can you tell if it’s present in your building? We’ve compiled all the information you’ll need to answer these questions and more.

Understanding Vermiculite

Vermiculite is a naturally occurring silicate material that expands significantly when exposed to heat. In its expanded state, vermiculite exhibits a range of properties that make it well suited for industrial use. In addition to being an excellent insulator, it’s also non-combustible, absorbent, compressible, odourless and inert – valuable attributes that have seen it widely used across many industries.

Despite its widespread use, there are a number of health risks associated with vermiculite. While pure vermiculite is relatively safe, there are a number of cases where vermiculite-based products were contaminated with asbestos during the extraction or distribution process and sold to companies and the public. This means that many people could be at risk if they carry out construction or demolition work on a property containing tainted vermiculite.

Unfortunately, this is a very real concern here in Australia. Asbestos-containing vermiculite was sold here for decades, and experts estimate that thousands of homes across the country could contain contaminated vermiculite to this day. Of course, it’s not just residential homes that are at risk. For example, in 1988, more than 800 cubic metres of vermiculite was removed from the roof of the Canberra Centre, highlighting just how widespread the issue could potentially be.

How do we Use Vermiculite in Australia?

As noted, the unique characteristics of vermiculite make it very appealing for use across a variety of sectors, including:


We touched on it before but it’s worth repeating: vermiculite is an excellent insulator. This makes it the perfect addition to construction materials such as concrete, where durability and resilience are obviously highly valued. Vermiculite is more or less impervious to fire and is very light in weight (compared to conventional concrete, at least), allowing builders to get more creative with their designs. While it can be used in many elements of a home’s design, vermiculite concrete can most commonly be found in precast concrete products, fireplace insulation and the roof and floor screeds.

Its heat retaining properties mean that vermiculite is widely utilised in building insulation. It’s incredibly easy to install in spaces of all shapes and sizes, while the material does an amazing job of minimising heat loss and regulating the temperature of indoor areas. Insulation material is the most common source of vermiculite asbestos. If you suspect your property may contain vermiculite asbestos, be sure to enlist the services of a professional and carry out a comprehensive asbestos test.

Vermiculite is also used in some types of plaster. It offers some notable advantages over traditional plaster, including better coverage, excellent adhesion and superior resistance to heat and fire.


It goes without saying that horticulture plays an important role in the local economy. In fact, Australian horticulture has an annual gross value of almost $9 billion, according to figures collated by the Department of Agriculture and Water Resources.

The country’s ability to produce food depends on the quality of our soil, and this is where vermiculite comes into play. Due to its expanding properties, the mineral allows nutrients, water and air to penetrate the soil, allowing plants and crops to grow much more efficiently. Vermiculite’s natural ability to absorb moisture also helps growing substrates retain water, which is very useful in the more arid parts of Australia where hydration efficiency is critical. As further evidence of its versatility, vermiculite is often used in fertilisers and pesticides, and even serves a purpose for encapsulating seeds.

Fireproofing products

Thanks – at least in part – to its incredibly high melting point of 1350 degrees Celsius, vermiculite is commonly used in fireproofing and fire protection products. These products range in function from sprayable premixed coatings to standard fire resistant boards and everything in between. In the petrochemical industry, where heat and fire are perhaps the two greatest risks to worker safety and operational efficiency, vermiculite-based goods are ubiquitous.

Pool liners and packing material

Vermiculite is utilised in some niches that have very particular requirements. Exfoliated vermiculite is incorporated into many types of swimming pool liners, as the mineral offers a steady base while simultaneously insulating the bottom of the pool against the harsh, cold terrain. The porous nature of vermiculite reduces the risk of structural damage if changes in the water table level affect the swimming pool.

Distribution centres have also benefited from the use of vermiculite. Unlike other packing materials, the exfoliated mineral is pourable, meaning it can effortlessly provide protection for objects of any shape and protect them from any damage that may occur during the transportation process.

The Importance of Vermiculite Asbestos Testing  

Despite the many uses and benefits of vermiculite, exposure to the mineral does carry some potential health risks due to its association with asbestos. With this in mind, it’s vital that you take the time to perform an asbestos analysis to ensure the vermiculite on your work site is not contaminated with the hazardous substance.

With extensive experience across all aspects of environmental safety testing, SERS is your number one choice when it comes to asbestos testing in Australia. Get in touch with the team today to find out more.