Choosing Chemical Resistant Gloves in Canada: Permeation, Breakthrough Time and the SDS (2026)

No glove material resists every chemical. Selection depends on the specific substance, its concentration, temperature and how long skin contact lasts, and the number that matters is breakthrough time: how long the chemical takes to permeate completely through the material. The rule is simple to state and often ignored: breakthrough time must exceed the expected duration of exposure.

There is one fact in this area that changes how you should read every glove chart, and it rarely appears in buying guides. For chemical mixtures, permeation time cannot be predicted from data on the individual components. If you handle blends, and most trades do, the chart may not answer your question at all.

Permeation, penetration and degradation

These three words get used interchangeably in product copy and they describe different failure modes.

CCOHS guidance on chemical protective glove selection draws the distinction clearly. Penetration occurs when a chemical leaks through seams, pinholes and other imperfections in the material. Permeation is different: the chemical diffuses through material that is completely intact.

That is the unsettling part. A glove with no visible damage, no tear and no hole can still be passing chemical to the skin underneath, molecule by molecule, with nothing to see and often nothing to feel.

Degradation is the third mode, measuring physical deterioration of the material from chemical contact. The material may soften, harden or swell, and in the worst case it may actually dissolve in the chemical. Degradation is at least visible, which makes it the easiest of the three to catch.

Breakthrough time and how to use it

Breakthrough time is determined by applying the chemical to the outside of the glove and measuring how long it takes to detect that chemical on the inside surface. It gives an indication of how long a glove can be used before the chemical permeates through.

One caveat worth carrying: the sensitivity of the analytical instruments used influences when a chemical is first detected. Breakthrough time is a laboratory measurement under controlled conditions, not a guaranteed safe-wear timer for your specific task.

As a working guide, breakthrough figures are commonly grouped as follows. Over eight hours is excellent and suits a worker wearing the same gloves through a full shift. Two to eight hours is good for medium exposure and intermittent contact. Fifteen minutes to two hours is fair, appropriate for disposables, short exposure per use, or splash protection only.

The minimum requirement in every case is that the breakthrough time exceeds the expected duration of exposure. If a task takes forty minutes of sustained contact and your glove's breakthrough time for that chemical is thirty, the glove is the wrong choice regardless of what else it does well.

The mixtures problem

This is the point that should change how you use a selection chart.

CCOHS states that the properties of a mixture, especially permeation time, cannot be predicted by using data from the individual components of that mixture. Two chemicals that each permeate slowly through a material may, combined, permeate quickly. The chart cannot tell you, because the chart tested the components.

Most workplace chemicals are mixtures. Degreasers, thinners, cleaning compounds, adhesives, coolants and coatings are formulations rather than single substances. A worker who looks up the primary solvent on a chart and selects on that basis is making an assumption the data does not support.

Where you handle a mixture, the honest answer is that you need data for that mixture, from the manufacturer or the supplier of the glove, rather than an inference from a component. Where that data does not exist, treat the selection as conservative: shorter wear time, more frequent changes, and a material with strong resistance across the whole component list rather than one that excels against the main ingredient.

Start with the task, not the glove

A CCOHS occupational health and safety specialist has described the correct starting point as analysing the tasks involved. Describe the task, identify the chemical types, and note their concentration, composition, temperature, pH and toxicity levels. One critical factor to identify before selecting gloves is how the chemical will actually be handled.

That last point drives more of the decision than material choice does. Occasional splash contact, sustained immersion and handling wet parts are three different exposures, and they call for different gloves even with the same chemical.

Cuff length follows directly from it. A worker dipping hands into a tank needs protection well up the forearm, which a wrist-length glove cannot provide no matter how good the material. The Forcefield 18-inch chemical resistant gloves with textured grip exist for that reason, where a shorter insulated PVC glove with a knit wrist suits handling rather than immersion.

Temperature matters in both directions. Heat generally accelerates permeation, so a chemical handled warm may break through faster than the room-temperature test figure suggests. Cold introduces the separate problem of dexterity and a lined glove requirement.

The SDS is the Canadian starting point

Most authoritative guidance available online on this topic is written around European standards, referencing ISO 374, EN 16523, ECHA guidance and UK regulatory advice. Those frameworks are informative, and they are not the ones that govern a Canadian workplace.

In Canada, hazard information reaches the worker through WHMIS, and the safety data sheet is where glove guidance for a specific product is supposed to live. Section 8 of an SDS covers exposure controls and personal protection, and it is the first place to look before consulting any general chart.

Where an SDS names a glove material and a thickness, follow it. Where it is vague, treat that as a signal to ask the supplier for permeation data rather than to guess. Keeping SDS documents current and accessible is itself a compliance obligation, not a filing preference.

Provincial and territorial occupational health and safety legislation sits alongside WHMIS, and requirements vary. As with all PPE, the wording on a product listing deserves scrutiny, a point covered in our guide to CSA certified versus CSA compliant.

Gloves are not the whole barrier

Hands are where most chemical contact happens, and they are rarely the only exposure. A splash that reaches the glove usually reaches the forearm, the boot and sometimes the face.

Footwear is the most commonly overlooked piece. Standing in a wash-down area or handling spills means the boot is in sustained contact with whatever is on the floor, and ordinary leather is not a chemical barrier. The STC Trump 6-inch chemical resistant boot and the taller STC Keep 8-inch version are built for that exposure, and the Acton Function 15-inch waterproof PVC boot covers higher wading depth.

Outerwear matters where spray or overhead work is involved. The Hurricane FR chemical resistant rain jacket combines chemical and flame-resistant properties for work where both hazards are present.

Eye and face protection belongs in the same assessment, covered in our safety glasses guide. For general hand protection outside chemical work, see our guide to work gloves for construction workers, and for the wider kit the complete PPE checklist for Canadian workers and our guide to PPE requirements for Canadian construction sites.

Inspection, removal and reuse

Because permeation is invisible, inspection catches only some failure modes. Check gloves before every use for cracking, swelling, stiffening, discoloration and any change in texture, all of which indicate degradation and mean the glove comes out of service.

Removal technique matters more with chemical gloves than with any other type. The outside surface is the contaminated surface, and a worker who peels gloves off carelessly transfers whatever is on them to bare skin, defeating the entire exercise at the last step.

Reuse deserves a decision rather than a habit. Once a chemical has begun permeating, the material continues to hold and release it, so a glove that has been in sustained contact may not reset simply by being taken off and left overnight. Where breakthrough time is short relative to the task, disposables changed frequently are often the better system than a heavier reusable glove worn too long.

Store gloves away from heat, direct sunlight and chemical vapour, all of which degrade materials before the glove has done any work.

Frequently Asked Questions

What is breakthrough time?

Breakthrough time is how long a chemical takes to permeate completely through a glove material. It is measured by applying the chemical to the outside of the glove and timing how long until it is detected on the inside surface. The glove's breakthrough time for your chemical must exceed the duration of expected exposure.

What is the difference between permeation and penetration?

Penetration is a chemical leaking through seams, pinholes or other imperfections in the material. Permeation is the chemical diffusing through material that is completely intact. Permeation is the more concerning of the two, because a glove can be passing chemical to the skin with no visible defect at all.

Can I use a glove chart for a chemical mixture?

Not reliably. CCOHS states that the properties of a mixture, especially permeation time, cannot be predicted from data on the individual components. Since most workplace chemicals are formulations rather than single substances, seek data for the actual mixture from the manufacturer or supplier rather than inferring from an ingredient.

What breakthrough time do I need?

It depends on your exposure. Over eight hours is generally considered excellent and suits full-shift wear of the same gloves. Two to eight hours is good for medium exposure and intermittent contact. Fifteen minutes to two hours is fair, suited to disposables, short exposures or splash protection only.

Where should I look first when selecting chemical gloves in Canada?

The safety data sheet for the product you are handling. Section 8 covers exposure controls and personal protection, and it is the Canadian starting point under WHMIS. General selection charts and manufacturer guides are useful afterward, but much of the guidance circulating online references European standards that do not govern Canadian workplaces.

How do I know a chemical glove has failed?

Degradation is visible: cracking, swelling, stiffening, softening, discoloration or changes in texture all mean the glove comes out of service. Permeation is not visible, which is why breakthrough time and a change schedule matter more than inspection alone for sustained contact work.

This guide is general workplace safety information, not chemical safety, medical or legal advice. Always consult the safety data sheet for the specific product you are handling and your workplace hazard assessment. Confirm obligations with the occupational health and safety authority in your province or territory.