Laboratory and Lab Safety Signs, Symbols and Their Meanings

Updated on June 8, 2016
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Susan is a science geek, and if that wasn't enough, she gets all nerdy over technology too. She is also a writer too.

Chemicals can be harmful, so always check their hazard symbols.
Chemicals can be harmful, so always check their hazard symbols. | Source


Did you ever come across laboratory signs or symbols but did not know what they meant? Or perhaps you would like to see pictures of all the various signs you would see in a laboratory and on chemicals.

In this hub, I will be giving you a detailed description of each laboratory sign or symbol and a photograph so you can easily identify it.

Signs around the world may come differently, the signs in this hub are used internationally. Even if the sign is not exactly like the signs here but has the same symbols imprinted on it, then you can be sure that that is the symbol. The author of this article claims no responsibility to any accidents that happen in the laboratory. Always consult a scientist working in a laboratory when dealing with chemicals.

Signs in a Laboratory

A laboratory is a place where dangerous events can occur, from high voltage stations to biohazards to corrosive substances. Many people are unaware of the dangers lurking in a laboratory! To alert you of hazards such as biohazards and high voltage stations, there are hazard signs placed in laboratories. You will very commonly find hazard signs in a laboratory, alerting you to various hazards you are expected to find. However, many people may not be able to identify what these hazard symbols mean. To help you get aware of the various meanings associated with each sign, this guide has been compiled to help you do so.

In this guide, there are two sections. One section which we will deal with first, is about signs that you can be expected to find on the walls of a laboratory workplace. The second will deal with signs you can be expected to find on various chemicals and even, household substances.

Gloves required!
Gloves required! | Source

Gloves Required

This symbol means that you have to wear gloves in protection from harmful chemicals or other materials. It is recommended to always wear gloves when dealing with caustic substances and other dangerous chemicals. Most hospitals and laboratories have plastic glove dispensers, so wear gloves before you enter a hospital laboratory and other chemical analysis laboratories.

To stay safe, you can wear gloves at all times in a laboratory if you wish, to protect you from chemicals.

Always dispose hypodermic needles in a sharps container.
Always dispose hypodermic needles in a sharps container. | Source


Biohazards are microorganisms which can potentially harm or even kill living organisms. These microorganisms can include viruses, contagious and dangerous bacteria, toxins and harmful microorganisms.

You will very commonly find a sign like this in biochemistry laboratories in hospitals as scientists and laboratory technicians working there would have to analyse samples from patients in the hospitals. These samples may contain highly contagious bacteria which may potentially threaten the health of the scientist.

If you ever see this sign, always ask a scientist working in the laboratory about such biohazards. It is recommended that you always wear a face mask and anti-bacterial gloves when dealing with such substances.

You may also see this sign on the packaging of hypodermic needles, samples and living tissues to be analysed. It is common etiquette for scientists to dispose of hypodermic needles in a sharps container.

High Voltage

This sign, 'high voltage' means voltage at such a high level that if any living organism comes in contact with the electricity, the electricity will cause harm or even death. This sign is found in industrial sites and perhaps laboratories.

Always stay clear of areas marked with this sign as coming in contact with the electricity will mean serious injury or death.

Many people ask how many volts 'high voltage' is considered to be. The answer to this question remains debated but in electric power transmission, it is said to be 35,000 volts. The IET say that high voltage is over 1000 volts. In industrial sites, workers protect themselves by wearing plastic gloves and other clothing.

Defibrillator can be found here.
Defibrillator can be found here.


This sign means that you have access to a defibrillator nearby. This can be seen in hospitals, some laboratories and industrial areas.

Hot Surface
Hot Surface

Hot Surface

This sign warns you that the equipment and apparatus beside you may be extremely hot and can severely burn you. This sign can be found in laboratories with hot plates to industrial areas with hot machines and steam pipes.

If you see this sign on a piece of apparatus, do not touch, you will get severely burned!

Very cold temperature!
Very cold temperature!

Low Temperature

This sign indicates very low temperatures, much lower than freezing point. You may find this sign in chemical storage areas, for storing liquid nitrogen and other chemicals.

Do not enter these areas without the supervision of a scientist and without appropriate protection.

This is what a common eye wash station looks like.
This is what a common eye wash station looks like. | Source

Eye Wash Station

This sign indicates the location of an eye wash station. If you accidentally place foreign chemicals or substances into your eyes, always try to locate an eye wash station immediately! Although some eye wash station signs may look different, always try to locate the station if there is no sign.

A typical eye wash station looks like the picture on the right, and contains two bottles of eye wash. Eye wash is a fluid which contains saline. Saline aids the rinsing of the eye and provides relief.

However, if you do get foreign chemicals in your eyes, always go to your hospital immediately! The chemicals that entered your eye could be corrosive and could cause permanent blindness!

Laser Beam Hazard

The term 'laser' stands for 'Light Amplification by Stimulated Emission of Radiation. It is usually a direct beam of light in one colour. The colour of the laser is determined by its wavelength, the unit being a 'nanometer'.

The light can be forced into one narrow beam which has a high radiant power per unit area. Because of this, the laser is very powerful enabling it to cut metal, seal objects and is used in surgical procedures. That is why you will find laser beams in factories, hospitals and surgical theatres.

As harmless as a laser may seem, that is not quite the case. Letting your skin to come in direct contact with a laser beam can be very dangerous and can have some disastrous consequences.

The eye is the most susceptible and can be damaged the easiest. If you wear no eye protection, looking at a laser beam can cause retinal damage, leading to damage to the eye, which can cause blindness or partial blindness. Always wear appropriate eye wear, always check with the owner of the equipment which eye wear is best.

Damage to the skin can also be caused if not protected. Wear protective non-flammable clothing. Laser beams can also cause fire so do not direct at any flammable substances!

Chemical Symbols

Recognising hazard laboratory signs in a laboratory is only one part, but recognising hazard signs on chemicals and other substances is another part. Many chemicals in a laboratory are harmful. They could irritate your skin, be dangerous to the environment, corrosive or toxic. That is why hazard symbols were invented, to alert you of the various dangers associated with each chemical. Material Data Safety Sheets can also be obtained about each chemical, but if you want to know quickly which chemicals are harmful and which are not, check the packaging. The signs on the packaging can tell you whether a chemical is irritant or toxic.


This sign indicates a drop of a corrosive substance falling onto a hand and burning into the hand. The word corrosive comes from the Latin word 'corrodere' meaning to gnaw. Letting a corrosive substance come in direct contact with your skin can cause the substance to eat into your flesh, down to the bone. Not pleasant! Also, if your eyes come in contact with a corrosive material they will be permanently damaged leaving you with blindness.

An example of a corrosive substance is caustic soda, which is mainly used in soap and draining sewage areas. If you see this sign on any chemical, aways handle with extreme care and wear gloves and face protection!

Dangerous To The Environment

This is a substance which may harm or kill natural species living in the environment including aquatic species, trees and plants. Throwing a substance with this sign into a lake or drainage system is not recommended, it could harm or even kill fish in the lakes, trees and plants or other animals. A substance which is dangerous to the environment is white spirit, which is used to clean paint from objects.



This is a substance which can be ignited easily when they come near a source of fuel and burn very vigorously. Always be careful when handling substances like these!


This symbol is denoted by a large black X on an orange background which has an 'I' on the bottom right corner. The word irritant means that it will cause your skin to turn red and may blister. Whilst irritant substances may not cause too much damage, it is still advisable to wear gloves.

There is another symbol which has a black X on an orange background and has no 'I' in the bottom right corner. This symbol means that the substance is 'harmful'.

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      • profile image

        atashachloie 26 hours ago

        great it helped inmy homework

      • profile image

        super man 2 months ago

        wow it is very helpful to school

      • profile image

        Duh Asian Gurl 4 months ago

        Wow! This really helped a lot for my year 7 science safety task. Was only looking for the poison sign though

      • profile image

        Midgy 4 months ago

        Helped me with yr 7 homework for Lab safety task. Thanks

      • profile image

        BELLO NAKAKA BELLO 5 months ago

        That is great, really appreciated, indeed i learn alot.

      • profile image

        I want more safety simbals 5 months ago

        Excellent it was very helpful

      • profile image

        anonymous 6 months ago

        Excellent it was very helpful. And I learnt alot. Thank you.

      • profile image

        kaka 7 months ago

        i love kaka

      • profile image

        S.S 7 months ago

        It was no help cause i like looking for the definition with the pic and no results tho

      • profile image

        Jeremie James 8 months ago

        I find it a little helpful but needs more signs and detail

      • profile image

        Ronica 8 months ago

        this helps me to get good grades and make my project look neat and nice. THANK YOU ONCE AGAIN!!

      • profile image

        angel 8 months ago

        Thank you. I have learn a lot and also It make my project wonderful

      • profile image

        WhoTheHellAreYou 9 months ago

        i am going to say Thank You in 4 languages:

        Thank You-English




      • profile image

        Jake Paul 9 months ago

        This is great! dab on them haters!

      • profile image

        unknown 9 months ago

        Really good

      • profile image

        Juanito 9 months ago

        this web site helped me a lot with my assignment.

      • profile image

        unknown 9 months ago

        I was actually looking for the radiation sign but this is a very good website for other sign.

      • profile image

        NICK CROMPTON 9 months ago

        England is my city!!!

      • profile image

        Georgia wing 9 months ago

        Thank you so much this web site was last minute exsam helper thank you once again xx ;)

      • profile image

        trisha booo 9 months ago

        i learn a lot on this web side we do this kind of work in school

      • profile image

        Niger 9 months ago


      • profile image

        Manners 9 months ago

        Thanks.. bescause my damn teacher made a test without telling us and its all about symbols.. follow me on facebook kent perez

      • profile image

        HawkEye 10 months ago

        Thank you, for i had to study different symbols and this webpage worked as my last minute helper.

      • profile image

        madison 10 months ago

        thanks but this did not help at all

      • profile image

        choco_chipzy 11 months ago

        This helps so much in my homework! Thank you!

      • profile image

        wren 12 months ago

        thank you

      • profile image

        Llyne Barts 012 12 months ago

        Hehe. Thanks for the information. Really helpful. Keep it up.

      • profile image

        mudassir 13 months ago

        what is the difference between the symbol of irritant and harmful??

      • profile image

        huhuhu 13 months ago

        bre2cute I think ur talking about biohazard

      • profile image

        Solomon Desta 13 months ago

        It would have been more useful if you write it separately for each departments labs.

      • profile image

        Beryl 15 months ago

        Very helpful it helped me do my assignment and educational

      • profile image

        Asah Levi 16 months ago

        So helpful ,it helped me with my assignment

      • profile image

        Maryam 16 months ago

        helping alot

      • profile image

        S K Sharma 17 months ago


      • profile image

        Seailtoynup 18 months ago

        Thank you !! This really helped me for my assignment

      • profile image

        angelina 18 months ago

        really helped me with knowing symbols thanks

      • profile image

        Charlene wooten 18 months ago

        What's a 0301-laboratory, chemistry what does it envoy mentioned contains and a laboratory, hematology 0305 can someone please explain to me what this means preferences from a doctor

      • profile image

        Suresh Kumar Mandal 19 months ago

        I am working in a Chemical Laboratory. So I really got the knowledge after read this topic.

      • profile image

        kawaiicat777 19 months ago

        it helped me with my homework but it needs more sighns :)

      • profile image

        GabrielTD 20 months ago

        its supper for me to learn n0w that i now all the signs

      • profile image

        Vibekananda champati 20 months ago

        Good ! but more symbols should be added.

      • profile image

        jeremiah 21 months ago

        pretty good but u should put what to do in case of an accident

      • profile image

        Lydia 21 months ago

        I'm so glad to have found this! I am doing research for a design quiz and this helped me so much - there isn't very much comprehensible information about safety signs online WITH information. So THANK YOU!

      • profile image

        wajid iqbal 21 months ago

        awesome bundle of thanks

      • profile image

        alott 22 months ago

        wow its is amesome!!!

      • profile image

        samson 22 months ago

        wow it was awesome ,but it need to be more explained and also need more signs because new signs have been brought out.

      • profile image

        Noah Hill 22 months ago

        I love this website

      • profile image

        lol 22 months ago

        hi it need more pictures so pls add more

      • profile image

        rihana 23 months ago

        realy thanks

      • profile image

        nero 24 months ago

        Thanks it helped me a lot for my assignment

      • profile image

        jani1 2 years ago

        it was really really helpful thank you very much

      • profile image

        xee 2 years ago

        it helped a lot but need more signs with xplanation

      • profile image

        Upz 2 years ago

        It helped a lot. But it would be better with more signs in it.

      • profile image

        Hope 2 years ago

        Thanks a lot it has helped a awesome!

      • susi10 profile image

        Susan W 2 years ago from The British Isles, Europe

        Melanie - Thanks so much for reading this and the awesome comments. :D I agree, it's really important to know this, whether a scientist or not. There are so many home products that have these signs, and most people don't even look at them!

      • melbel profile image

        Melanie Shebel 2 years ago from Midwest USA

        Wow! This is such a helpful hub. I worked as a TA in a lab and have friends that do the same. We have to learn this and the students do too (although they often lack interest.) It's really important stuff!

      • profile image

        ADRIAN PAUL 2 years ago

        Thanks for the nice blog,really appreciated it


      • profile image

        irene 2 years ago

        thank you...really a big help

      • profile image

        ghallix14 2 years ago

        ... thank you for this,. it will help me in the laboratory..

      • profile image

        Xtiana 2 years ago'was so helpful

      • susi10 profile image

        Susan W 3 years ago from The British Isles, Europe

        Jao - I'm the author, so if you have any questions just ask me. Thanks for the read and for commenting. It's always appreciated! :-)

      • profile image

        Jao 3 years ago

        i need the author of this, can you help me?

      • profile image

        sophia ellis 3 years ago

        owesome this really good , it really helped me THANKS

      • profile image

        andz harry 3 years ago

        thx for putting this out if you didn't well i ll be dead

      • profile image

        sydney 3 years ago

        Thank you very much i am a Chemical Lab Analyst it has really made me to understand well the signs and its meaning.

      • profile image

        john 3 years ago

        this blog makes my assignment very good

      • profile image

        arbab 3 years ago

        Its really helpful for me thnku sooo much

      • profile image

        Obuekwe Emeka 3 years ago

        Thanks a lot, this is really gonna help in my MCB 315 Assignment. Life Saver. Whew

      • profile image

        datta 4 years ago

        i got laboratory sign meaning

      • profile image

        shereen 4 years ago

        this really answer my question

      • profile image

        bre2cute 4 years ago

        you helped me a lot but there is one i am trying to find and i can't find it

      • profile image

        lovely_mark 4 years ago

        its good but needs more photos and the explanations art a little too long can u shorten them a little im a teacher and the kids wont really understand those long things

      • susi10 profile image

        Susan W 4 years ago from The British Isles, Europe

        Hi Zara,

        Thanks for commenting and giving such positive comments! I am glad you liked this hub!

      • Zara thompson profile image

        Zara Thompson 4 years ago from New York

        Really appreciative ,thank you so much for your blog.

      • jabelufiroz profile image

        Firoz 4 years ago from India

        Really helped me. Voted up.


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