Entropy Resins Safety, Care and Handling instructions

Entropy Resins Safety, Care and Handling instructions

Working with epoxy can be fun, satisfying, and safe as long as you follow a few precautions.

This article will cover several common shop hazards of working with Entropy Resins epoxy products. Use these common-sense practices to ensure your safety, productivity, and enjoyment in the unique and wonderful things you can create with Entropy Resins.

It begins by following the directions and heeding the warnings on Entropy product labels. Entropy Safety Data Sheets English and Safety Data Sheets French are a great resource for detailed epoxy safety information.

Epoxy Safety Topics

  1. Why you must avoid overexposure
  2. Proper epoxy storage
  3. Preventing overexposure
  4. Working clean
  5. Epoxy-related hazards
  6. Disposing of epoxy safely

Topic 1:


Most substances have a safe level of exposure. The more toxic a substance, the less it takes to reach its overexposure threshold. Exceeding safe exposure levels can cause health problems. Your immune system and overall health can also affect your tolerance of a substance.

When formulating the epoxy resins and hardeners in the Entropy Resins product line, we go for the best physical properties possible with the lowest risk to people and the planet. This keeps the proportion of hazardous ingredients in Entropy products small enough that, with good work habits, you can easily avoid overexposure.

Hazardous substances can enter the body by being absorbed through the skin, inhaled, or ingested. The usual route for a given substance depends on its physical characteristics and how it is normally used.


Exposure to resin, hardener, and mixed epoxy is more likely when they are in liquid form. As epoxy cures, its chemical ingredients react to form a non-hazardous solid. Solidified epoxy is unlikely to enter the body except in the form of sanding dust, which we’ll discuss shortly.

Skin contact is the most common route of exposure to resins and hardeners. Even minor skin contact, repeated often, can cause chronic health problems. In rare cases, with prolonged or repeated skin contact, harmful ingredients may be absorbed.

Exposure by inhaling vapours is unlikely because epoxy products evaporate slowly. But this risk increases when you are working in a small or confined workspace, don’t have good ventilation in your workspace, or if you’re heating the epoxy.

Heating Epoxy Tips and Safety

If heating Epoxy resins prior to usage, remember to heat the Epoxy bottle only. You do not want to heat up Hardener.

The most efficient approach to heating resin is the use of a water bath. The water should be no warmer than 35 degrees Celsius. This provides the best heat transfer to the crystallized resin and reduces the risk of damaging the container. Where a water bath is not practical, such as in drum or tote sizes, other heating techniques may be used, such as drum band heaters that blending the resin continually and carefully monitor the temperature.

Regardless of the heating method you choose, exposing the resin to temperatures above the recommended 35°C can lead to adverse effects such as discoloration.

Warming of resins prior to mixing and application will ensure consistency in the viscosity and improve the lamination wet-out of reinforcement fabrics.

People rarely ingest epoxy, but it can happen when resin, hardener or mixed epoxy contaminate food, beverages or eating surfaces.


When you sand partially cured epoxy, it produces airborne dust that can get on your skin, be inhaled or even ingested. Although epoxy may be firm enough to sand within a few hours, it may not cure completely for up to two weeks. Until then, the epoxy dust can contain unreacted hazardous components. Never overlook or underestimate this sanding hazard.


Let’s explore the most common health problems stemming from epoxy use. Nearly all of us can prevent these issues. Even those who do develop a health problem can usually resume using epoxy with additional precautions.

  • DERMATITIS: Fewer than 10% of people react when overexposed to epoxy resin or hardener. Usually, the reaction is a rash, medically known as acute contact dermatitis. Epoxy resin or hardener can cause the rash. Discomfort may be severe, but the symptoms usually go away after stopping contact with the epoxy. However, repeated contact may cause chronic contact dermatitis. This is usually milder but longer lasting. Left untreated for long periods, it can progress to eczema and may include swelling, blisters, and itching. Partially cured epoxy sanding dust that settles on the skin can also lead to contact dermatitis.
  • ALLERGIC DERMATITIS (SENSITIZATION): While allergic dermatitis―the body hyper-reacting to an allergen―is more serious, less than 2% of epoxy users are likely to get it. This sensitization is an allergy that results from repeated exposures. Your chance of developing allergic dermatitis depends on your immune system and the degree and frequency of your exposure to epoxy. You’ll be more susceptible if you’ve had a massive overexposure to epoxy or if you’re already allergic to an epoxy ingredient. Your risk is also higher if you have fair skin, have already been exposed to other sensitizing substances, have hay fever or other allergies, or are under stress.

You can become sensitized to epoxy after many exposures or just one. Some people get sensitized over a matter of days. For others, it can take years. The best approach is to avoid all exposure because there is no way to predict how much exposure you can take before becoming allergic.

Allergic reactions to epoxy result in skin irritation or respiratory problems. Irritated skin is by far the more common reaction. It usually looks like poison ivy and may include swelling, itching, and red eyes. The symptoms can range from mild to severe and be acute or chronic.

Inhaling epoxy vapours frequently or for long periods can irritate your respiratory tract. Sensitive skin areas like the eyelids may itch and swell after exposure to highly concentrated epoxy vapours.

See your doctor if irritation persists or worsens after avoiding epoxy for several days. There is no antidote for epoxy sensitization, but some symptoms can be treated with medicine.

Once you’ve become sensitized, additional (and sometimes increasingly severe) reactions are more likely with future exposures, even to tiny amounts of epoxy. It’s difficult, but not impossible, to prevent recurrences. Don’t resume epoxy use until all symptoms are gone. Strictly follow all handling procedures. Review the product Safety Data Sheets (SDS) for preventative measures, symptoms, and first aid.


By themselves, Entropy epoxy hardeners are moderately corrosive. Hardener burns are uncommon, and burns from mixed epoxy are even less common. Left in contact with skin, hardener can severely irritate it and cause moderate chemical burns. These develop gradually, beginning with irritation and slight pain. The burn may discolour skin or slightly scar it. The time it takes for epoxy hardener to burn the skin depends on the skin area and the hardener concentration. Mixing resin with hardener dilutes the hardener, making it less corrosive. Although mixed epoxy is less corrosive, never leave it on your skin as it cures rapidly and is hard to remove.


Breathing highly concentrated epoxy vapour risks respiratory irritation and sensitization. Epoxy vapours aren’t likely to be highly concentrated at room temperatures. But if you’re already sensitized to epoxy, exposure to low vapour concentrations can trigger an allergic reaction. At warmer temperatures and in unventilated spaces, epoxy vapour levels increase.

Sanding epoxy before it has fully cured can cause serious health problems. Epoxy chemicals remain reactive until they have cured, and when inhaled, these particles get trapped in the mucus lining of your respiratory system where they can cause severe irritation and/or respiratory allergies.

If you’re a smoker or your lungs are already strained, you’re far more likely to develop serious respiratory problems from epoxy.

Topic 2:


Resin should always be stored indoors and off the ground (not on concrete or tiled basement/shop floor), ideally in a temperature-controlled environment. For extended shelf-life, resin and hardener must always be kept above freezing – optimal working and storage temperatures of Epoxy and Hardeners is 20 – 30 degrees Celsius. If you live in a colder climate, storage of epoxy and hardeners is not recommended in a garage unless it’s temperature controlled.

Warm Room

If the temperature in your workspace is difficult to control, consider building a warm resin station or temperature-controlled cabinet for the storage of your resins. This will help you to meet the manufacturer’s advertised pot-life and tack-free times while ensuring consistent kicks.

Topic 3:



These guidelines address both industrial and casual epoxy use. If followed, they’ll protect you from epoxy and other hazardous materials.

Use the least hazardous product that will do the job. This reduces or even eliminates hazard sources.

Set up a safe shop. Install equipment and follow procedures that prevent or reduce exposure. This includes effective ventilation, which, depending on your workshop, can range from high-tech air-filtration and exhaust systems to basic floor or window fans. This can address a wide range of vapours and dust. A dedicated cabinet or isolated area for storing hazardous materials can also reduce exposure.

Wear goggles, safety glasses, gloves, a respirator, and protective clothing appropriate for the project. The bare minimum for working with epoxy is gloves, eye protection, and protective clothing. You can protect yourself from epoxy vapours by using a respirator with an organic vapour cartridge. The approved respiratory protection against epoxy dust, wood dust, and nuisance dust is a dust/mist mask or respirator.


The US government hasn’t established exposure limits for Entropy Resins epoxy products. Entropy guidelines are based on the levels approved for the raw materials used in these formulations, as shown in each product’s SDS.

Is there such a thing as no VOC resins?

There is no such thing as NO VOCs! All epoxies, resins and polyesters emit VOCs. In fact, VOCs are quite prevalent.

The definition reads: Volatile Organic Compounds (VOCs) are organic chemicals that have a high vapour pressure at room temperature. VOCs are numerous, varied, and ubiquitous. They include both man-made and naturally occurring chemical compounds. They are emitted from natural and man-made environments, including from wood glue, baby blankets, and most scents and odours.

However, the question applies to the issue that some VOCs are dangerous to human health or can cause harm to the environment. Harmful VOCs typically are not acutely toxic but have compounding long-term health effects. This is why it is a good thing to minimize your harmful VOC exposure whenever possible and why having the lowest VOC resin is important.

Our Entropy Resins (CCR, CCS) have a VOC output at less than 0.79% of volume. This being the lowest VOC output we could find amongst other resins. In comparison, other resins and polyesters have a VOC output of 10% by volume or more.

As a consumer, the question one should ask is, what is your VOC emission factor once we have mixed epoxy and hardener. Swell publishes our VOC output on our TDS cards. Email or call us for further detail on our testing results.


Avoid contact with resin, hardeners, mixed epoxy, and sanding dust from partially cured epoxy. Wear protective gloves and clothing whenever you handle epoxies. If you get resin, hardener or mixed epoxy on your skin, remove it immediately. Resin is not water-soluble―use a waterless skin cleanser to remove resin or mixed epoxy from your skin. Hardener is water-soluble―wash with soap and warm water to remove hardener or sanding dust from your skin.

Always wash thoroughly with soap and warm water after working with epoxy, including sanding.

If you get epoxy on your clothes, change them immediately. Use skin cleaners to remove any epoxy from your skin and clothing. Do not continue to wear clothing with epoxy on it. If it’s mixed epoxy, you can wear the item again once the epoxy has fully cured.

Never use solvents to remove epoxy from your skin. Solvents, even mild ones like vinegar, can drive the epoxy’s ingredients into your skin, making overexposure more likely.

Stop using epoxy if you develop a reaction. Resume work only after symptoms disappear, usually after several days. When you resume work, improve your epoxy safety precautions to prevent overexposure to epoxy, its vapours, and sanding dust. If problems persist, discontinue use and see your doctor.


Wear safety glasses or goggles to protect your eyes from contact with resin, hardeners, mixed epoxy, and sanding dust.

If you get epoxy in your eyes, flush them immediately with water under low pressure for 15 minutes. Seek medical attention.


Avoid breathing epoxy vapours and sanding dust. Entropy Epoxies have low volatile organic content (VOC), but vapours can still accumulate in unvented spaces. Provide ample ventilation in small workshops or other confined spaces.

When you can’t adequately ventilate your workspace, wear an approved respirator with an organic vapour cartridge.

When sanding epoxy―especially partially cured epoxy―provide ventilation and wear a dust/mist mask or respirator. Breathing partially cured epoxy dust increases your risk of sensitization. Even when the epoxy has cured to a sandable solid, a complete cure may require over two weeks at room temperature.


After handling epoxy, wash thoroughly, especially before you eat or smoke.

If you swallow epoxy, drink large quantities of water―DO NOT induce vomiting. Hardeners are corrosive and can cause additional harm if vomited. Call a doctor or contact Poison Control immediately. Refer to First Aid procedures on the products SDS.

Topic 4:


Maintain a clean workshop to avoid incidental contact with the epoxy. If you have epoxy residue on your gloves, don’t touch door handles, light switches, or epoxy containers because you’ll probably touch them again when you’re not wearing gloves.

  • Clean up epoxy spills with a scraper, collecting as much material as possible. Follow up with paper towels.
  • Contain large spills with sand, clay or other inert, absorbent material. DO NOT use sawdust or other fine cellulose materials to absorb hardeners. You may reclaim uncontaminated resin or hardener for use.
  • Clean up resin or mixed epoxy with acetone, lacquer thinner or alcohol. Follow all safety warnings on solvent containers.
  • DO NOT dispose of hardeners in trash containing sawdust or other fine cellulose materials―they can spontaneously combust.
  • Clean hardener residue with warm, soapy water.


Puncture a corner of the resin or hardener can and drain the residue into a new container.

Do not dispose of resin or hardener as liquids. Mix small quantities of waste resin and hardener and allow them to cure to an inert solid.

CAUTION! Pots of curing epoxy can get hot enough to emit hazardous fumes and ignite combustible materials nearby. Place pots of mixed epoxy in a safe and ventilated area, away from any combustible materials. Dispose of the solid epoxy mass only after it has completely cured and cooled. Follow federal, state or local disposal regulations.

Topic 5:



Epoxy cures by an exothermic chemical reaction that generates heat. Left to cure in a contained mass, such as a mixing pot, epoxy can get hot enough to melt plastic, burn your skin, or ignite combustible materials nearby. The larger or thicker an epoxy mass, the more heat it generates. A 100-gram mass of mixed epoxy can reach 400-degrees.

To prevent heat buildup, pour mixed resin and hardener from the mixing pot into a roller pan or other wide, shallow container. Fill large cavities with epoxy in multiple layers rather than a single, thick layer. Heat buildup and uncontrolled curing are unlikely in bonding and coating jobs because spreading the epoxy into thinner layers dissipates heat.

Mixed resin and hardener become hot and frothy as they thermally decompose, generating toxic vapours, including carbon monoxide, oxides of nitrogen, ammonia, and possibly some aldehydes. Cured epoxy can emit these vapours when overheated, such as when using a flame to release a casted or embedded object. Use a flame to do this only as a last resort, and work in a well-ventilated area.

While leftover mixed epoxy is curing, set the container aside where you can monitor it. Use a fan to disperse vapours, directing them away from people. Air-purifying respirators may not be adequate for these vapours and fumes.

Combining hardeners with sawdust, wood chips, or other cellulose can cause a fire. When hardener is spilled onto or mixed with sawdust, the air and moisture react with the amine, generating heat. If not dissipated quickly, this can ignite the sawdust. Never use sawdust or other types of cellulose to absorb a hardener spill. Do not pour unused hardener into a trash can with sawdust or other cellulose materials.

Entropy Resins epoxy resins and hardeners are classified as non-flammable because their flash points are greater than 200°F and they evaporate slowly. Furnaces, wood stoves, and other heat sources do not pose a serious fire hazard in the presence of epoxy vapours.


The health and safety risks of spraying epoxy are enormous, and we never recommend it. Epoxy leaving a spray gun nozzle is reduced to a fine mist that is easily inhaled. This can cause serious lung damage and other health problems. This mist can settle on your skin, causing sensitization and allergic reaction. It can settle on your eyes, injuring them.

Spraying increases the amount of hazardous volatile components released compared to other application methods. Thinning the epoxy with solvents adds to health and safety risks. The health and flammability hazards are similar to any spray painting operation. If you must spray epoxy, control hazardous vapour and spray mist with isolation and enclosure such as a ventilated and filtered spray booth. Always use an air-supplied respirator and full-body protective clothing.

Topic 6:


Use these guidelines for disposing of unused resin and hardener:

  • Minimize waste by saving unused resin and hardener for future projects. Entropy Resins epoxy products have a long shelf life when stored in sealed containers.
  • Mix unwanted resin and hardener and allow it to cure and cool to a non-hazardous solid for disposal.
  • Warm containers are easier to drain.
  • When disposing of empty resin and hardener containers, make every attempt to empty the container. No more than 3% by weight of the total capacity of the container should remain inside of it at the time of disposal.
  • Reclaim spilled or leaked epoxy that is uncontaminated. If it’s contaminated, it is waste. If you’ve used solvent to clean up a spill, the contaminated epoxy-solvent mixture may be a regulated hazardous waste.
  • Never release hazardous wastes directly to the land, air or water. Many communities organize periodic waste collections where they accept hazardous household wastes for safe disposal.

The disposal guidelines above may not comply with the laws and regulations in your area. Always refer to your local, state and federal regulations.


Your health and safety are in your hands. Staying informed about the products you use and following basic health and shop safety practices will protect your health and safety while using Entropy Resins epoxy products.

(References: Epoxy Safety)

More Questions

If you have any technical questions about your resin project call our helpline 310-882-2120. The helpline is staffed by Composite Material Engineers ready to walk you through any project . If you have questions about stock or shipping email or call us.


Entropy Resins has the highest
*(BC) Bio-content
of any resin in Canada.
Why is (BC) & (MBBC) important?

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