If you look closely at the labels of hand-hygiene products in a hospital — hand rub, antibacterial hand wash, surgical hand scrub — one name appears almost every time: Chlorhexidine Gluconate. It is so common it is often taken for granted. Yet there is a strong technical reason it became a standard. Here is the explanation: what it is, how it works, and why hospitals trust it.
What chlorhexidine gluconate is
Chlorhexidine gluconate — often shortened to CHG — is a salt form of chlorhexidine, an antiseptic compound in the bisbiguanide family. It is not new: chlorhexidine has been used in medicine for decades, and is among the most thoroughly studied antiseptics.
CHG works as a broad-spectrum antibacterial — effective against gram-positive and gram-negative bacteria, some fungi, and some enveloped viruses. It is used on skin and hands, not on inanimate surfaces.
How it works: positively charged, attacking the microbial cell
The key to how CHG works lies in its electrical charge. The CHG molecule is positively charged (cationic), while the surface of a bacterial cell is negatively charged. Like two opposite poles of a magnet, CHG is drawn to and binds firmly onto the bacterial cell wall.
Once attached, CHG damages the cell membrane:
- At low concentrations, it makes the membrane leak so the cell's contents escape — bacterial growth halts (bacteriostatic).
- At higher concentrations, it coagulates the cell's contents — the bacteria die (bactericidal).
This physico-chemical mechanism acts relatively fast and is hard for bacteria to "evade".
What makes it special: residual activity
Many antiseptics can kill germs. What sets CHG apart is what happens afterward.
CHG has a property called substantivity — it binds to the skin layer and to proteins, and stays there. As a result, CHG keeps actively suppressing germ growth for hours after application. This is what is called residual, or persistent, activity.
Compare it with alcohol: alcohol kills very fast, but once it evaporates, its protection is zero. CHG provides protection that continues. For when to use which, see Hand Rub vs Hand Sanitizer vs Soap-and-Water. This residual effect is the main reason CHG became the standard for surgical hand scrubs and for hand hygiene in high-risk areas.
One ingredient, several concentrations
CHG is used at different strengths to suit the task:
- Around 2–2.5% — for routine hand antisepsis: hand rubs and antibacterial hand washes.
- 4% — for surgical hand scrubs and pre-procedure skin preparation, which demand greater strength and a stronger residual effect.
The Emguard hand-hygiene line follows this split: Hand Rub and Hand Wash at 2.5% CHG, and Hand Scrub at 4% CHG for surgical needs. The concentration is not just a number — it matches the agent's strength to the risk level of the use.
Why hospitals trust it
It is this combination of properties that makes CHG hard to match:
- Broad spectrum — it reaches the wide range of bacteria relevant in a healthcare environment.
- Residual activity — continuing protection, not a single strike.
- Cumulative effect — the more routinely it is used, the more the active layer builds up on the skin.
- Can be formulated gently — important for medical staff who clean their hands dozens of times a day.
- Long proven — backed by decades of research and listed in guidelines, including for surgical hand preparation.
The limits worth understanding
No antiseptic is perfect. Understanding CHG's limits matters as much as understanding its strengths:
- Not a spore killer. CHG does not inactivate spores such as Clostridioides difficile, and is less effective against some non-enveloped viruses. For those cases, washing with soap and water is still required.
- It can trigger irritation or allergy in some people — CHG allergy is real, though rare. Stop using it if a reaction appears.
- Keep it away from the eyes and the inner ear.
- It is not compatible with ordinary soap. Anionic soaps neutralize the positively charged CHG — which is why CHG products are specially formulated. Do not mix them yourself.
- Use it as intended. Excessive, careless use risks lowering bacterial susceptibility over the long term.
Conclusion
Chlorhexidine gluconate became a hospital standard not by chance, but because of a rare combination: a broad spectrum, a long-lasting residual effect, and a safety profile that can be formulated gentle enough for very frequent use. Understanding a product's active ingredient helps you choose it correctly — rather than simply trusting the label.
Emguard uses CHG as the basis of its entire hand-hygiene line: Hand Rub and Hand Wash at 2.5%, and Hand Scrub Plain and Hand Scrub Floral at 4%.
Want to discuss choosing hand-hygiene products for your facility? The Emguard team is ready to help via WhatsApp.