Hot Melt vs Water-Based PSA for Labels: Which Should You Choose?

A hot melt PSA is solid at room temperature. It is melted, coated onto the liner while molten, and sets the moment it cools, staying permanently tacky. Our general grade, HM-666, is applied at 150 to 170°C. Because there is no water or solvent in it, nothing has to evaporate.

A water-based PSA is an acrylic emulsion: adhesive polymer dispersed in water. It is coated wet, and the water is driven off in a drying oven, leaving the adhesive film behind. There is no solvent involved, but the line needs drying capacity matched to its speed and coat weight.

Hot melt removes the drying stage entirely. That means no oven to run, no VOCs from the process, and a line that can run as fast as the coater allows. For high-volume commodity labels, such as shipping and logistics labels, barcode stickers and retail price labels, that usually works out to the lowest cost per square metre.

Hot melt also covers wet conditions on film. HM-555 is formulated for BOPP, PET and PP label stock with excellent water resistance, for beverage labels, frozen food, outdoor use and bath and personal care products.

Water-based acrylic emulsions are where the specialist properties are. If your label has to do something beyond sticking, you will almost always be choosing a water-based grade:

• Labels that peel off cleanly once, such as price tags and promotional labels: RM-9850, a removable grade.
• Labels that can be lifted and reapplied: RP-9500, a repositionable grade.
• Labels for returnable glass bottles that must come off in the bottle washer: WO-1918, a wash-off grade.
• Battery labels that face acid: BATT-1000.
• Labels that need compliance documents for export: HX-855H, which is REACH + RoHS-10 + phthalate-free.

For everyday paper and semi-gloss label stock, HX-855 is our general purpose water-based grade, with excellent ageing so labels keep performing through long storage.

1. What does your coating line have? A drying oven points to water-based; a hot melt coating station points to hot melt. Changing the line is a bigger decision than changing the adhesive.
2. Does the label ever need to come off? If it must peel off cleanly, be repositioned or wash off, you need a water-based specialist grade.
3. Will it meet water, cold or condensation? On filmic stock, HM-555 is built for that. Tell us the conditions and we will compare it with a water-based option.
4. Does your customer need compliance documents? Hot melt grades are supplied with ISO 9001:2015 and a batch COA. If your buyer asks for REACH or RoHS documentation, choose the water-based grade that carries it.
5. How much volume, at what price? For long runs of commodity labels, hot melt's speed usually wins on cost per square metre.

Two of our 23 grades are hot melts; the rest are water-based. So when we recommend one, it is because it fits your line and your end use. See the full comparison on our hot melt PSA page and our water-based PSA range.