Are Your Labels Actually Waterproof? What to Check Before You Buy
Posted by : Mercury Labels Ltd on Tuesday, September 8, 2026 in Waterproof and Weather Proof Labels.
"Waterproof"
is one of the most confidently printed words in the labelling industry. It also
happens to be one of the least checked.
There is no licence
needed to use it. No test a supplier has to pass before the word goes on a
product page. A label can be described as waterproof because it survived a
light spray in a warehouse, or because a paper laminate held up for a few days
on a shelf. Neither of those things means the label will still be readable
after three months outdoors, in a chiller, or on something handled with wet
hands every day.
If you buy labels
for a living, for products, packaging, plants, chemicals, or anything else that
meets moisture at some point in its life, the word on the product listing tells
you very little on its own. What matters is what sits underneath it.
Waterproof is not a regulated term
Unlike an IP rating
on an electrical enclosure, there is no formal classification a label has to
meet before a supplier can call it waterproof. Some manufacturers do test
against recognised standards, such as BSS609 for marine-grade adhesives, and
will happily share that data. Many others use the word simply because it reads
better than "water-resistant" on a search results page.
That gap is where
buyers get caught out. A label bought as waterproof, and used as though it
were, can fail well before it should, and by then the batch has already gone
out.
Waterproof, water-resistant and weatherproof are different promises
These three terms
get used almost interchangeably in marketing copy, but they describe different
levels of performance.
Water-resistant
means a label can cope with occasional splashes or brief contact with moisture
without immediate damage, but repeated or prolonged exposure will eventually
affect the adhesive or the print. Waterproof means the label is built to be
submerged, rained on or handled wet, repeatedly, without the material breaking
down. Weatherproof adds resistance to sunlight, temperature swings and general
outdoor conditions on top of moisture resistance.
A label only has to
satisfy the first definition to be technically accurate if described as
water-resistant. It has to satisfy the second before it earns the word
waterproof.
Three things that actually decide the answer
The word on the
listing is a claim. These three things are the evidence.
1. The face material
Paper, even when
laminated, has limits. Once moisture reaches the fibres through a scuffed edge
or a weak seal, it spreads. Genuinely waterproof labels are usually made from
synthetic materials such as polyester or vinyl, which do not absorb water at
all. If a supplier cannot tell you the actual material, rather than just the
word waterproof, that is worth asking again.
2. The adhesive
A waterproof face
material with the wrong adhesive still fails. Adhesives behave differently in
the cold, on damp surfaces, and on smooth plastics versus porous cardboard. A
label rated for occasional outdoor splashes is not automatically rated for
permanent submersion, chilled storage, or a freezer. Ask what conditions the
adhesive has actually been tested for, not just whether it is described as
strong.
3. The print
This is the part
buyers check least often, and the part that fails most visibly. A completely
waterproof label with print that was not designed to survive moisture still
loses its information. Standard inkjet ink can smear the moment it gets wet.
Direct thermal print, produced without a ribbon, fades with heat and humidity
over time even on a waterproof face stock. Laser toner and thermal transfer
print using a resin ribbon hold up far better, because the print becomes part
of the surface rather than sitting on top of it.
A label can pass on
material and adhesive and still let a business down here.
Where this catches buyers out
A garden centre
orders plant labels described as waterproof and prints them in-house on a
standard inkjet printer to save time. The label stock genuinely is waterproof
polyester, so the plastic survives being watered daily without any issue. The
ink does not. Within a couple of weeks, the plant names have smudged into an
unreadable blur, even though the label underneath is in perfect condition.
Nothing about the
material was misdescribed. The print method was simply never part of the
conversation.
What to ask before you buy
- What the label is actually made from, not
just what it is called - What adhesive standard or testing it has
been through, and for which conditions - Whether the print method suits the
environment the label will face - Whether it is rated for occasional moisture
or continuous exposure - Whether a physical sample is available to
test in your own conditions before ordering in volume
A supplier who can
answer all of these without hesitation is describing a tested product. One who
repeats the word waterproof with no detail behind it is describing a marketing
line.
Getting it right first time
At Mercury Labels,
our range of waterproof labels is manufactured from polyester and vinyl
and tested against the BSS609 adhesive standard, so the claim is backed by
something you can ask to see. If your labels also need to survive a specific
environment, such as chilled storage or a deep freeze, our guide to label materials for chilled,
frozen and outdoor products
goes into more depth on matching material to conditions. And if you already
have labels printed and are wondering whether they can be protected after the
fact, that question is covered separately in Can You Waterproof a Label After
Printing?
For anything printed
to order, our custom printed labels service matches the print method to the
material, so the label and the information on it are built to last together.
If you are not sure whether the labels you are
about to order will actually hold up, ask before you buy rather than after the
batch has gone out. It is a five-minute conversation that tends to save a much
longer one later.
