Can You Store Class 3 Flammable Liquids With Class 8 Corrosive Substances?

Originally published March 14, 2017 08:36:08 PM, updated February 27, 2022

Are you storing multiple Classes of Dangerous Goods in your organisation? Safe chemical storage is a serious and often complex issue, but it becomes even more crucial an issue when your business is carrying both Class 3 Flammable Liquids and Class 8 Corrosive Substances. When there are multiple Classes of Dangerous Goods within a workplace or on a remote worksite, there may be a potential for these chemicals to react — causing a devastating incident such as human harm or a fire, explosion or violent chemical reaction.  To clear up this important issue, we thought we’d dedicate this blog to answering the question, ‘Can you store flammable liquids with corrosive substances?’  

But first things first — let’s look at the chemical properties and definition of both flammable liquids and corrosive substances.  

What Are Flammable Liquids? 

Flammable liquids are liquids, or mixtures of liquids, or liquids containing solids in solution or suspension which give off a flammable vapour at temperatures of not more than 60 °C, closed-cup test, or not more than 65.6 °C, open-cup test, normally referred to as the flash point. 

The ‘flash point’ is the temperature at which a flammable liquid gives off enough vapour for it to ignite — in the presence of an ignition source. Flammable liquids are substances, as explained above in the ADG Code, which have the potential to ignite at low temperatures. 

Flammable liquids fires burn and spread quickly — they are notoriously difficult to put out. These fierce blazes often engulf warehouses or businesses, destroying property and the environment, emitting plumes of toxic fumes, and putting human life at risk.  

While flammable liquids are found in almost every Australian workplace, it doesn’t mean that these chemicals should be handled by just any staff member or contractor. Class 3 Flammable Liquids require comprehensive flammable liquids training and must be stored, transferred and decanted in the correct and compliant way in order to reduce risk of fire, explosion and human harm. 

Flammable Liquid FireFlammable liquids emit flammable gases which can easily ignite if they meet an ignition source in your workplace.

Key Points To Consider When Using Or Storing Flammable Liquids 

  • Low flash point – this means that your flammable liquids have the capability to ignite at room temperature. Ignition sources must be kept at least 3 m away from your flammable liquids. 
  • Hazardous vapours – your flammable liquids emit hazardous vapours at a certain temperature, which can lead to asphyxiation and human harm. The vapours can also travel quickly and cause a fire or explosion if they meet an ignition source.  
  • Spill and vapour containment – to reduce the risks associated with the handling and storage of flammable liquids, you must have risk control measures in place to contain and manage chemical spills and hazardous vapours. 
  • Human harm – flammable liquids must be carefully handled by your team, as vapours and liquids that make contact with the eyes or skin can cause immediate health effects, such as burns, nausea and dizziness. 

STOREMASTA Blog Image - HAZCHEM ALERT do you need to monitor the health of your workersExposure to Class 3 Dangerous Goods can cause adverse health effects including nausea and dizziness.

Some Examples Of Common Flammable Liquids 

As we’ve already mentioned, Class 3 Flammable Liquids are found in just about every workplace (and backyard shed).  

Commonly used flammable substances include: 

  • Petrol 
  • Diesel 
  • Paint 
  • Paint thinners 
  • Acetone 
  • Toluene 
  • Diethyl ether 
  • Benzene 
  • Ethanol 
  • Methanol 

If you are carrying any chemicals that are classed as flammable liquids, you must ensure they are handled and stored in a compliant manner. We’ll explain this further into the blog.  

What Are Corrosive Substances? 

Substances which, by chemical action, will cause severe damage when in contact with living tissue, or, in the case of leakage, will materially damage, or even destroy, other goods or the means of transport. 

As explained in the ADG Code, corrosive substances are defined by their ability to corrode living tissue and materials such as metal and stone.  

Due to the destructive nature of the chemical, Class 8 Dangerous Goods require strict workplace protocols if they are being handled, transferred, decanted or stored. 

Corrosive substances have the potential to quickly degrade property and vehicles — and can cause immediate (and severe) human harm. If spilt on the skin or splashed in the eyes of staff, corrosive substances can rapidly corrode human tissue, resulting in skin irritation, burns, bodily injury and blindness.   

There are 2 main types of corrosive substances: acids and bases. It’s vital that acids and bases are segregated in the workplace, as they can react with each other. 

STOREMASTA Blog Image - HAZCHEM storage flammable liquids, corrosives and toxic chemicalsCorrosive acids and bases are incompatible substances and must never be stored in the same work area.

Corrosive acids and bases have the potential to neutralise each other, resulting in hazardous situations such as the creation of poisonous salts. Before storing two different corrosive substances together, you must find out if they are compatible chemicals. You can do so by referring to the Safety Data Sheet for each corrosive substance.  

Key Points To Consider When Using Or Storing Corrosive Substances 

  • Incompatibility between corrosive substances – ensure the Safety Data Sheets for all corrosive substances are on hand, so you can segregate incompatible Class 8 Dangerous Goods.  
  • Corrosive properties – as corrosive substances can attack living tissue as well as a range of materials, including metal, extreme caution must be taken to ensure chemical spills and leaks don’t occur.  
  • Emergency equipment – corrosive-resistant gloves, eye protection and PPE must be provided for staff handling corrosive substances. Eyewash stations and safety showers must also be installed, and chemical spill kits must be available in the event of a spill. 
  • Human harm – all corrosive substances must be carefully handled by staff to ensure that the risk of chemical spills, leaks or accidental splashes are reduced and managed.  

Corrosion of metal

Corrosive substances will chemically attack living tissue as well as a range of materials including metal and stone.

Examples Of Corrosive Substances 

From manufacturing plants to laboratories, corrosive substances can be found in a vast range of workplaces. Some common examples include: 

  • Sulfuric Acid  
  • Hydrochloric Acid  
  • Glycolic Acid 
  • Nitric Acid  
  • Citric Acid  
  • Bromine 
  • Hydrogen Peroxide 
  • Calcium Hydroxide  
  • Sodium Carbonate  
  • Aluminium Hydroxide

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Can You Store Flammable Liquids and Corrosive Substances Together? 

The short answer here, is ‘Definitely not!’  

These Classes of Dangerous Goods are incompatible — and, therefore, must be stored at least 3 metres from each other. A better option is to store each Class of Dangerous Goods in its own compliant safety cabinet to provide effective chemical segregation. 

The Australian Standard AS 3833:2007 - The storage and handling of mixed classes of dangerous goods, in packages and intermediate bulk containers, explains that Class 3 Flammable Liquids and Class 8 Corrosive Substances must not be stored together.  

If these Dangerous Goods mix, a chemical reaction may occur which will result in the production of large quantities of toxic or flammable gas. If flammable gas develops, there is potential that it could come into contact with an ignition source — causing an explosion or fire. If toxic gas is created, it can have severe effects upon human health — including suffocation and burning of internal organs. 

For workplaces that rely on a range of Dangerous Goods, it’s important to fully understand and meet the segregation requirements set out in AS 3833:2007. By understanding the chemical and physical properties of the substances that you are using (and their Dangerous goods classification), you will be able to implement risk control measures to ensure that incompatible substances — such as Class 3 Flammable liquids and Class 8 Corrosive Substances — are not stored together.  

Storing Dangerous Goods: Features Of A Compliant Safety Cabinet 

To help you better understand your obligations with the safe storage of Dangerous Goods, we’ll take a look at the features that make flammable cabinets and corrosives cabinets the best choice for storing these separate classes of Dangerous Goods. 

Let’s start with the flammable liquids storage cabinet. 

What Are The Features Of A Flammable Cabinet? 

  • Constructed in compliance with AS 1940:2017 - The storage and handling of flammable and combustible liquids 
  • Double-walled sheet steel construction, 40mm thermic air barrier 
  • Liquid-tight spill containment sump, 150mm deep 
  • Self-closing, close fitting doors that latch at two points 
  • Sequential door closing system 
  • Adjustable perforated shelving for free air movement, 100mm adjustment increments 

You must only store Class 3 Flammable Liquids in your flammable cabinet.

What Are The Features Of A Corrosive Storage Cabinet? 

  • Constructed in compliance with AS 3780:2008 - The storage and handling of corrosive substances 
  • Liquid-tight spill containment sump, 150mm deep 
  • Self-closing, close fitting doors held shut by catches at 2 points. The doors do not open inwards and are capable of being opened from within the cabinet 
  • Sequential door closing system 
  • Adjustable perforated shelving for free air movement, 100mm adjustment increments 
  • Powder coat finish for high durability and performance 
  • PVC spill trays for shelves providing corrosion protection 


Your corrosive storage cabinet is specifically designed and manufactured to meet the requirements of AS 3780:2008.

As we’ve detailed above, if you want to safely store a particular Class of Dangerous Goods, it’s best practice to choose a compliant safety cabinet that’s designed and constructed to suit the type of chemical that you carry. Flammable liquids and corrosive substances have different chemical and physical properties, which make them incompatible substances.  

Therefore, you must segregate incompatible substances by storing them at least 3 m apart — or storing each Class of Dangerous Goods in its own safety cabinet or store.   

Like To Know More About Chemical Segregation? 

In this blog, we’ve mentioned incompatibilities between Class 3 Flammable Liquids and Class 8 Corrosive Substances, but there are many more chemicals that can react dangerously if they are stored or handled in the same work area. If your business has any type of Dangerous Goods, we urge you to learn more about the chemical segregation of incompatible substances. Why not download our free Segregation Chart and ensure your chemicals are stored safely and in full compliance with the Australian Standards and WHS Regulations.  

How to segregate incompatible classes of dangerous goods

Walter Ingles

Walter Ingles Compliance Specialist

Walter is STOREMASTA’s Dangerous Goods Storage Specialist. He helps organisations reduce risk and improve efficiencies in the storage and management of dangerous goods and hazardous chemicals.

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