Material guide

Direct thermal labels are simple, but not universal

Direct thermal stock does not need ribbon, which simplifies purchasing and changeover. The tradeoff is durability: heat, sunlight, abrasion, chemicals, and long storage can darken or fade the image.

Best use cases

Direct thermal is strongest for short-life shipping labels, indoor carton labels, pick tickets, and temporary routing labels where the useful life is measured in days or weeks.

Avoid it for long-life labels

If a barcode must survive months of handling, outdoor exposure, freezer cycles, or cleaning, treat direct thermal as a risk unless the supplier proves the specific coated stock.

Procurement checks

Ask for the coating type, darkness setting, scanner test result, storage recommendation, and whether the roll works with your gap, notch, or black mark sensor.

Planning checklist

Test heat and sunlight exposure before approving the stock.
Confirm the label does not darken in the storage area.
Scan samples with the weakest scanner used on the floor.
Document the expected label life in the purchase request.

Common failure points

Using direct thermal for asset labels or outdoor bins because it is cheaper.
Ignoring warehouse heat near dock doors, trailers, or shrink tunnels.
Testing only fresh prints instead of samples that have aged for several days.

Supplier questions

What is the expected readable life for the coated stock in indoor warehouse storage?
Which scanner and print darkness settings were used for sample verification?
Does the roll format match the printer sensor, core, and outside diameter limits?

Related decision guides