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DMF, or Dimethylformamide, is a colourless, water-miscible organic solvent with a faint ammonia-like odour. It is widely used across the chemical industry; in the production of adhesives, surface coatings, synthetic fibres, pharmaceuticals, and plastics. In the context of hand protection, DMF plays a specific role in the manufacturing of solvent-based polyurethane coatings.
This guide covers everything you need to know; from the chemistry behind PU coatings to compliance standards and safer alternatives.
DMF in PU gloves can be present as a residual chemical, but proper manufacturing processes and regulatory frameworks are designed to minimise risk and protect workers.
To fully understand DMF's role, it helps to understand how PU-coated gloves are produced. The manufacturing process can be summarised in three stages:
1. Liner preparation:
A knitted glove liner, usually nylon, polyester, or a blended fibre, is produced to the desired size and fit specification.
2. Coating application:
The liner is dipped into a polyurethane solution. In solvent-based manufacturing, DMF acts as the carrier solvent, enabling the PU to penetrate the liner and cure into a flexible, adherent coating. The chemical reaction between PU and DMF causes the coating to expand and bond with the substrate.
3. Drying and curing:
The coated glove is processed through drying and washing stages. During this phase, manufacturers take deliberate steps to remove residual DMF; through heat treatment, washing cycles, and ventilation; to reduce residual levels in the finished product.
Responsible manufacturers invest in process controls that minimise residual DMF content. The extent to which residual DMF is removed depends on the quality of the manufacturing process, which is why compliance with standardised testing methods is so important.
The regulatory landscape around DMF in PPE is shaped by several key frameworks that safety managers and procurement professionals should be familiar with:
EN ISO 21420:2020: This standard, which replaced EN 420:2003 and applies to all CE-marked protective gloves, sets a clearly defined maximum threshold for DMF in gloves of less than 1,000 ppm (equivalent to less than 0.1% w/w). It also requires that no carcinogenic amines are detectable and that no nickel is released, aligning glove safety requirements directly with REACH regulations. Safety managers specifying CE-marked gloves should ensure that products are certified to EN ISO 21420:2020 rather than the superseded EN 420:2003.
Occupational Exposure Limit (TWA): The time-weighted average (TWA) airborne concentration of DMF to which workers may be exposed over a normal 8-hour working day is limited to 5 parts per million (ppm). This governs workplace air quality rather than glove content directly, but it underscores the recognised occupational health concern around DMF.
REACH Directive 1907/2006: Under the European REACH regulation, glove manufacturers are legally required to disclose the presence of DMF if it exceeds 0.1% (1,000 ppm) w/w in the finished article. This transparency obligation ensures that buyers, safety managers, and end users have access to the information they need to assess risk and make informed PPE decisions.
EN 16778:2016: This European standard provides a harmonised testing methodology for measuring DMF content in glove materials. It defines how to test for DMF but does not set a maximum permissible limit on its presence in finished gloves. Compliance with REACH disclosure requirements remains the primary regulatory obligation for manufacturers.
When evaluating PU gloves, ask your supplier directly: does it meet EN ISO 21420:2020 standards? Does this product comply with REACH 1907/2006? Has it been tested to EN 16778:2016? These questions will quickly establish whether a product meets the baseline of responsible manufacturing.
Not all polyurethane gloves carry the same DMF profile. The manufacturing route has a direct bearing on whether DMF is present at all, and understanding this distinction can help safety managers make more informed procurement choices.
Solvent-based PU gloves: Manufactured using DMF as a carrier solvent. May contain residual DMF as a by-product of the coating process. When produced by responsible manufacturers in compliance with EN ISO 21420:2020 and REACH, these products can still be used safely. However, it is important to verify compliance and understand the manufacturing process.
Water-based PU and nitrile gloves: These products use water-based coating technologies such as water-based PU or nitrile which contain no DMF at any stage of the manufacturing process. For safety managers seeking to eliminate DMF risk entirely, water-based alternatives offer a straightforward solution without compromising on performance, grip, or durability.
For the highest level of assurance, look for gloves certified to OEKO-TEX® Standard 100. Developed in the 1990s, OEKO-TEX is an independent testing and certification system for textile products at all processing levels. Gloves bearing the OEKO-TEX label are verified to pose no known risk to human health, providing safety managers with confidence that goes beyond regulatory compliance.
DMF is a legitimate consideration for any safety manager sourcing PU-coated gloves. The key is knowing what to look for. Here's a practical summary of what we have covered:
PU gloves, when properly manufactured and correctly specified, remain one of the most versatile and effective hand protection solutions available. With the right knowledge and the right supplier, your team can benefit from all their advantages, safely and with confidence.
Residual DMF levels in finished gloves are typically very low and regulated under chemical safety standards. Most health concerns relate to direct industrial exposure to DMF rather than finished PPE products.
No. Many modern PU gloves use water-based coating technologies, which do not involve DMF in the manufacturing process.
You can verify by asking suppliers whether the gloves are solvent-based or water-based, and by requesting testing data under EN 16778:2016. You should also ask whether the product is certified to EN ISO 21420:2020, which sets a maximum DMF threshold of less than 1,000 ppm for CE-marked gloves.
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