Choosing the correct glove material is one of the most important decisions when specifying gloves for a glove box, isolator or containment system.

Different glove materials behave differently when exposed to chemicals, solvents, acids, oils and other substances. A material that performs well against one chemical may offer significantly less protection against another.

Understanding chemical resistance can therefore help improve safety, reduce the risk of glove failure and ensure that the glove material selected is appropriate for its intended environment.

What does chemical resistance mean?

Chemical resistance describes how effectively a glove material withstands contact with a particular chemical without experiencing unacceptable deterioration or allowing the substance to pass through the material.

The level of resistance can vary considerably depending on both the glove material and the chemical involved.

Common glove box glove materials include:

• CSM
• EPDM
• Butyl
• Neoprene
• Latex

Each offers different characteristics, making some materials better suited to particular applications than others.

What happens when a glove is exposed to chemicals?

Chemical exposure can affect glove materials in several different ways.

One of the most visible effects is degradation. This occurs when contact with a chemical causes the physical properties of the glove material to change.

Depending on the material and chemical involved, this might include:

• Swelling
• Softening
• Hardening
• Cracking
• Discolouration
• Loss of elasticity
• Changes in surface texture

However, visible deterioration is not the only consideration.

A glove can sometimes appear to be in good condition while still allowing a chemical to pass through the material.

This process is known as permeation.

What is permeation?

Permeation occurs when molecules from a chemical move through the glove material at a molecular level.

This means that a glove does not necessarily need to have a visible hole or tear for a chemical to penetrate it.

The time taken for a chemical to begin passing through the material is often referred to as breakthrough time.

A longer breakthrough time will generally indicate greater resistance under the conditions in which the glove was tested.

However, laboratory test results should always be considered alongside the real operating environment.

Factors that can affect chemical resistance

Chemical compatibility is not determined by glove material alone.

Several factors can influence how a glove performs in practice.

Chemical concentration

A diluted chemical may affect a glove differently from the same substance at a much higher concentration.

The precise chemical and concentration being handled should therefore be considered when selecting a glove material.

Temperature

Higher temperatures can increase the rate at which some chemicals affect or permeate elastomer materials.

A glove that performs well under standard test conditions may behave differently when used with heated substances or inside a high temperature process.

Duration of exposure

Occasional contact and continuous immersion represent very different conditions.

The longer a glove is exposed to a substance, the greater the potential for degradation or permeation.

Mechanical wear

Glove box gloves are frequently stretched, flexed and subjected to repeated movement.

This mechanical stress can affect the condition of the material over time and may influence its ability to resist chemicals.

Glove thickness

The thickness of the glove can also affect chemical resistance and breakthrough time.

Thickness should therefore be considered alongside dexterity, comfort and the requirements of the application.

Why glove material matters

Different elastomers have different chemical resistance properties.

For example, Butyl gloves are often selected where strong resistance to certain gases and chemicals is required, while EPDM is widely used where resistance to weathering, ozone and a range of chemicals is important.

CSM is valued for its durability and broad chemical resistance, while Neoprene provides a useful balance of flexibility, durability and resistance across a variety of applications.

Latex offers excellent flexibility and dexterity, although its suitability will depend heavily on the substances being handled.

No single glove material is suitable for every chemical.

This is why material selection should always be based on the specific substances and operating conditions involved.

Using a chemical compatibility chart

A chemical compatibility chart provides a useful starting point when comparing glove materials.

MIP’s Chemical Compatibility Checker allows users to select a glove material and chemical to view its compatibility rating.

The tool uses the following rating system:

• 1 Recommended
• 2 Satisfactory
• 3 Poor
• X Insufficient data

These ratings can help identify materials that may be suitable for further consideration.

They should not, however, be treated as a substitute for a detailed risk assessment or testing under actual operating conditions.

Factors including concentration, temperature, exposure time and glove condition can all affect performance.

Chemical resistance should form part of a wider assessment

Chemical compatibility is only one part of glove selection.

The chosen glove should also suit the physical requirements of the process.

Other considerations may include:

• Required dexterity
• Glove length
• Glove thickness
• Port size
• Operating temperature
• Mechanical strength
• Sterilisation requirements
• Cleanroom or containment requirements
• Expected service life

In many applications, the best choice will involve balancing chemical resistance with comfort, flexibility and durability.

Regular inspection remains essential

Even where a glove material offers good resistance to the chemicals being handled, gloves should still be inspected regularly.

Chemical exposure, repeated movement and general wear can gradually weaken the material.

Any glove showing signs of damage, deterioration or changes in its physical properties should be assessed and replaced where necessary.

A suitable glove inspection and replacement procedure can help reduce the risk of containment failure and maintain the integrity of the glove box system.

Choosing the right glove box glove material

The correct glove material will depend on the chemicals being handled, the process involved and the wider operating environment.

MIP manufactures glove box gloves in a range of materials including CSM, EPDM, Butyl, Neoprene and Latex.

Our Chemical Compatibility Checker can help you compare the resistance of different glove materials against a wide range of chemicals.

For applications where additional guidance is required, our team can also help you identify the most appropriate glove for your glove box, isolator or containment system.

Frequently Asked Questions

What is the best glove box glove material for chemical resistance?

There is no single material that offers the best resistance to every chemical. CSM, EPDM, Butyl, Neoprene and Latex all have different strengths, so the most suitable option depends on the specific chemical, concentration, temperature and exposure conditions involved.

Can chemicals pass through a glove without damaging it?

Yes. Some chemicals can permeate through glove materials at a molecular level without causing obvious visible damage. This is why chemical compatibility should not be judged by appearance alone.

What is breakthrough time?

Breakthrough time is the period between initial chemical contact and the point at which the chemical begins to permeate through the glove material under test conditions.

Does glove thickness affect chemical resistance?

Yes. Glove thickness can influence permeation and breakthrough time, although thicker gloves may also reduce dexterity. The correct specification should balance protection with the practical requirements of the application.

How do I check whether a glove material is suitable for a chemical?

A chemical compatibility chart or checker can provide a useful starting point. However, the final selection should also consider factors such as concentration, temperature, exposure time and the specific operating environment.