Latex gloves are made through a multi-stage dipping process where hand-shaped molds are repeatedly submerged into liquid natural rubber latex, coated, heated to cure the rubber, and then stripped off as finished gloves. The entire sequence runs on a continuous production line, with hundreds of molds moving through each stage on a looped conveyor. Here’s how that process works from start to finish.
Raw Materials
The primary ingredient is natural rubber latex, a milky fluid tapped from rubber trees (most commonly grown in Southeast Asia). Fresh latex is stabilized with a small amount of ammonia, typically around 0.2%, to prevent it from coagulating during transport and storage. At the factory, this raw latex is compounded into a dipping solution by mixing in several additives: sulfur for vulcanization (the curing process that gives rubber its elasticity and strength), chemical accelerators to speed up that curing, and antioxidants to prevent the finished glove from degrading over time.
The accelerators are worth noting because they play a dual role. Compounds like thiurams and carbamates dramatically speed up the cross-linking of rubber particles during curing, cutting what would otherwise be a very long process down to minutes. However, these same chemicals are the most common cause of allergic contact dermatitis from rubber gloves. Manufacturers balance the need for efficient production against the goal of minimizing residual chemicals in the finished product.
The Hand-Shaped Molds
Every glove is formed on a hand-shaped mold called a “former.” These formers are typically made from ceramic materials like porcelain, bone china, or stoneware clay. They’re composed primarily of silica, alumina, and calcium oxide, chosen because they can withstand repeated heating cycles and resist the chemicals used throughout the process. Hundreds or even thousands of these ceramic hands are mounted on a continuously moving conveyor chain that carries them through each production stage in sequence.
Before each cycle, formers are thoroughly cleaned and dried to remove any residue from the previous glove. A dirty former creates defects in the finished product, so this cleaning step is critical to consistent quality.
The Coagulant Dip
The first active step is dipping each clean former into a coagulant solution. This is typically a calcium-based salt dissolved in water, most often calcium nitrate or calcium chloride. The coagulant serves a simple but essential purpose: when the former is later dipped into liquid latex, the calcium ions cause the rubber particles to clump together and stick to the mold surface, forming a uniform film. Without this step, the latex would simply slide off.
After the coagulant dip, the formers pass through a drying oven so the coating is dry and evenly distributed before they reach the latex tank.
Dipping Into Latex
The coagulant-coated former is then lowered into a bath of compounded latex and held submerged for a set period called the “dwell time.” The length of this dwell time, along with the concentration of the latex solution and the coagulant layer, determines the thickness of the final glove. Examination gloves are thinner and require a shorter dwell, while heavy-duty industrial gloves need a longer soak or sometimes a second dip.
As the former is withdrawn from the latex bath, a wet rubber film clings to its surface. At this point the glove is fragile and uncured, essentially just a skin of raw rubber held in shape by the mold.
Leaching and Protein Removal
Before curing, the wet film typically passes through a water leaching stage. The formers are dipped into tanks of warm water that wash away excess chemicals and, crucially, reduce the level of extractable proteins in the rubber. These natural latex proteins are the main trigger for latex allergies, so removing them is a major quality and safety concern.
Standard leaching involves multiple water washes. Research has shown that treating latex products with natural enzymes from pineapple (bromelain) or papaya (papain) at around 60°C for two hours, followed by four 15-minute water rinses, can significantly reduce residual protein levels. While not every factory uses enzymatic treatment, some form of water leaching is universal in medical-grade glove production.
Vulcanization
The gloves then enter curing ovens for vulcanization. This is the heat treatment that transforms soft, sticky raw rubber into the elastic, durable material you recognize as a finished glove. During vulcanization, sulfur atoms form chemical bridges (cross-links) between the long rubber polymer chains, giving the material its snap-back stretch and resistance to tearing.
Conventional oven vulcanization for latex products occurs at moderate temperatures, around 60°C or higher, for roughly 20 to 30 minutes depending on the manufacturer’s formulation. The accelerators mixed into the latex compound earlier make this process dramatically faster than it would be with sulfur alone. Some newer methods use microwave energy at low power (around 80 watts) for as little as 30 to 90 seconds, though conventional ovens remain the industry standard for large-scale production.
Surface Treatment for Easy Donning
Freshly vulcanized latex is naturally tacky, which makes gloves difficult to put on and pull off. Historically, manufacturers solved this by coating gloves in a powder made from cornstarch, talc, or silica. You dipped the cured glove into a wet powder slurry, dried it, and the powder acted as a lubricant.
Powdered gloves have largely been phased out. The powder picks up residual latex proteins and launches them into the air when gloves are snapped on, spreading allergens throughout clinical environments. The United States, Germany, the United Kingdom, and other countries now prohibit powdered medical gloves. Two alternatives have replaced them:
- Chlorination: Gloves are dipped in a chlorine solution that chemically alters the surface of the rubber, making it smoother and less sticky. This is the most common method for powder-free latex gloves.
- Polymer coating: A thin layer of synthetic polymer is applied to the glove’s interior surface, creating a slippery lining that allows easy donning without powder or chlorination.
Stripping and Quality Testing
Once surface-treated and dried, the finished gloves are stripped from the formers. On automated lines, mechanical fingers or air jets peel the glove off the mold, turning it inside out in the process (which is why the coated donning surface ends up on the inside). The bare former then loops back to the cleaning station and starts the cycle again.
Stripped gloves go through quality control. Samples from each batch are tested for pinholes using air inflation or water-leak tests. Tensile strength and elongation are measured to ensure the rubber stretches properly without tearing. Medical-grade gloves face additional testing for extractable protein levels and chemical residues before they’re packaged and shipped.
Biodegradability of the Finished Product
Natural rubber latex is technically biodegradable, but the vulcanization process and added antioxidants slow decomposition considerably. Commercial latex gloves take at least two years to fully break down in soil, and heavily crosslinked or additive-rich formulations can take even longer. By comparison, nitrile gloves (made from synthetic rubber) can persist in landfills for decades. Neither material disappears quickly, which is one reason single-use glove waste has become an environmental concern in healthcare and food service industries.