Self-Sterilising Material Science: The Next Generation of Bio-Hazard Protection

When discussing the cleanest PPE or the most hygienic PPE, people often mean the garment that feels safest in a high-risk setting. This is actually about far more than fabric, extending to what happens after exposure, how well contamination is controlled, and whether the garment is cleaned properly between uses. 

Today’s protective clothing can form an effective barrier, but most fabrics don't actively destroy biological contamination on contact which is why cleaning PPE still matters so much. However, self-cleaning polymers may be on the horizon to change this.

What self-sterilising PPE is trying to change

Self-sterilising PPE has an interesting potential. Instead of relying only on a barrier, researchers are developing fabrics and surfaces with nanotechnology that begin reducing microbial load on contact. In use, this would allow for:

• Lower bioburden on the garment surface
• Lower chance of transfer during handling
• Less dependence on clothing turnover between uses

While this area has attracted attention in infection control and advanced textile development, self-sterilising PPE is still a research-led concept in most cases, and is not a universal commercial standard. 

Copper-based material science and how it works

Copper surfaces have long been studied for contact-killing effects, and it's now one of the most closely studied materials in this area. 

Once microbes land on a copper-active material, the copper ions starts interacting with them by breaking down the microbe before it can act on the clothing.

1. The surface releases copper ions: These ions come into contact with the surface of the microbe and begin to disrupt normal function. 
2. The membrane starts to break down: Copper can damage the cell wall or membrane, making it more permeable. Once that barrier is weakened, the microbe becomes more vulnerable. 
3. Copper gets further into the cell: Once the membrane is damaged, copper ions can move further inside and interfere with proteins, enzymes and other cell components.
4. Oxidative stress causes wider damage: Copper’s redox activity can drive oxidative stress, which damages lipids, proteins and genetic material such as DNA or RNA. At that point, the microbe can no longer function normally.

With nanotechnology, the smaller particles and engineered copper structures create a much larger reactive surface area. This gives microbes more contact points and can speed up the ion release.

In one particular study, researchers reported findings of a highly active self-sterilising copper configuration that acted successfully in just 30 to 60 seconds. While this result does relate to a specific engineered copper structure (and not to every copper-treated textile on the market), it demonstrates why the field is garnering attention. 

The environmental case for less washing

Another reason that self-cleaning and strongly antimicrobial textiles are a hopeful advancement is the possibility of reducing wash frequency.

A fabric that can safely repel liquids and fight microbes on its own brings a clear environmental upside. It'll generally need fewer wash cycles, which will in turn mean less water, less detergent, lower energy use and less wear on the garment itself for longer use.

However, the environmental benefit is only real if the material stays safe and durable in use. There's not much point reducing laundering if, for example, a coating fails after repeated abrasion, or if the finish introduces another chemical trade-off. 

Further research is still needed to understand its true effectiveness in practice. Until then, we're committed to sustainable product production and washing in our services.

How to clean PPE when the bio-hazard risk is high  

Until self-sterilising materials become more widely proven and more widely available, proper commercial laundering is still the most reliable defence against cross-contamination. Stick to an effective process to prolong your garments' best condition.

1. Don't rely on visible cleanliness: A garment can look clean and still carry contamination. 
2. Use the right wash process for the garment type: At phs Besafe, we hand-sort and segregate garments by specialist properties, such as flame retardancy and high visibility, so each item goes through the correct wash cycle. 
3. Inspect garments during the cleaning cycle: As exemplified in our recent NPg Group arc flash case study, we inspect every garment during laundering, carry out repairs where needed, and replace garments that are beyond repair as part of our service.
4. Take contaminated or degraded items out of service: If a garment can't be safely recovered, it should be replaced or destroyed. This is especially important for workwear exposed to hazardous substances or garments that have lost their protective properties. 

Hydrophobic options you can already use  

For now, the more accessible end of this market isn't fully self-sterilising PPE, but hydrophobic or liquid-repellent finishes. These fabrics can help repel water and reduce surface wetting, which may help garments stay cleaner on the surface and make contamination easier to remove. 

Still, hydrophobic is not the same as sterile. A liquid-repellent finish doesn't remove the need for cleaning PPE properly, and the most hygienic PPE is still PPE that is laundered, inspected, tracked and replaced at the right time. 

Improve your workwear's lifespan with phs Besafe   

For right now, the cleanest PPE is still the PPE that goes through a regular controlled cleaning process. At phs Besafe, our laundry service is designed to clean workwear hygienically, preserve specialist garment properties, and keep track of repairs and garment life. If an item is no longer safe to use, we can also support you with replacement and secure destruction. 

While the next generation of textile technology continues to develop, get in touch to find out how we can supply you with the best workwear and washing services.