Laboratory cryogenic environments place extremely stringent demands on labels. Ordinary labels tend to peel off, become brittle, and lose legibility under conditions such as low temperature, moisture, and repeated freeze–thaw. BRD BradyLAB Lab series cryogenic freezer labels are designed specifically to solve these problems and are the ideal choice for laboratory specimen identification.
1. Extreme Low-Temperature Environment Challenges
Common extreme low-temperature environments in laboratories include:
Liquid nitrogen (-196 °C): long-term storage of cells, strains, viruses, etc.
-80 °C ULT freezer: storage of tissues, blood, nucleic acids, etc.
Dry ice (-78.5 °C): for specimen transport and short-term storage.
In these environments, labels must withstand multiple challenges simultaneously, including low temperature, condensation, mechanical friction, and chemical reagents.
2. Technical Features of the Lab Series Labels
Specialty face stock: low-temperature-resistant polyester (PET) or polypropylene (PP) face stock maintains good dimensional stability and mechanical strength at extreme low temperatures.
Low-temperature-resistant adhesive: specially modified acrylic adhesive maintains adhesion at low temperatures and leaves no residue at high temperatures.
Protective coating: surface lamination or coating treatment improves scratch resistance, solvent resistance, and water resistance.
Print compatibility: compatible with thermal-transfer printing; combined with dedicated resin ribbons, printed information remains clearly legible over the long term.
3. Specifications
The Lab series offers a variety of label sizes compatible with common laboratory containers such as 1.5 mL/2.0 mL microcentrifuge tubes, cryovials, microplates, microscope slides, and reagent bottles.
4. Applications
Widely used in laboratory fields including molecular biology, cell biology, pathology, immunology, and drug discovery.
5. Quality Assurance
BRD BradyLAB has established a comprehensive quality control system, testing each batch of labels for low-temperature resistance, adhesion, and print compatibility to ensure stable and reliable product quality.
Related Compliance Standards
The design and application of labels for extreme low-temperature environments must meet the ISO 20387:2018 requirements for specimen identification durability; adhesive reliability is verified per GB/T 2792-2014, and barcode quality is assessed per ISO/IEC 15416.
Featured Products
For the label materials and application scenarios covered in this article, the following BradyLAB (BRD) products are available for selection reference (click to view specifications and request a quote):
- Lab147-629/34 × 22 mm biobank cryovial microscope slide -196 °C liquid nitrogen nylon low-temperature label (Request a Quote)
- Lab032-629/30 × 20 mm biobank cryovial microscope slide -196 °C liquid nitrogen nylon low-temperature label (Request a Quote)
- Lab111-629-10A diameter 13 biobank cryovial microscope slide -196 °C liquid nitrogen nylon low-temperature label (Request a Quote)
- Lab296-629 biobank cryovial microscope slide -196 °C liquid nitrogen nylon low-temperature label (¥999/roll)
FAQ
Q: What is the difference between extreme low-temperature labels and ordinary low-temperature labels?
Extreme low-temperature labels are optimized for environments below -80 °C and even -196 °C liquid nitrogen; the face stock and adhesive offer greater resistance to low-temperature embrittlement and freeze–thaw.
Q: Do labels become brittle at -196 °C?
Ordinary labels may crack and become brittle; extreme low-temperature labels use deep-freeze-resistant face stock that remains flexible at -196 °C, with no edge lifting or peeling after application.
Q: What is the basis for selecting extreme low-temperature labels?
The actual storage temperature is the primary criterion, followed by the surface material to be applied to and the printing method; final confirmation should be based on measured freeze–thaw cycle data.
Materials Science Fundamentals of Labels at Extreme Low Temperatures
Whether a label can "stay adhered and remain legible" at extreme low temperatures is fundamentally a materials science issue. Regarding face stock, ordinary materials undergo freezing of molecular chain segment motion and increased rigidity at low temperatures, making them prone to brittle cracking; polyimide (PI), with its rigid aromatic ring structure and high glass transition temperature, remains flexible at -196 °C and has become the preferred face stock for liquid nitrogen scenarios. Regarding adhesives, if the glass transition temperature (Tg) of a pressure-sensitive adhesive is higher than the service temperature, the adhesive layer enters a glassy state and loses adhesion; therefore, low-temperature labels must use specialty adhesives with a low Tg.
Key Performance Indicators of Low-Temperature Labels
| Indicator | Description | Verification Method |
|---|---|---|
| Temperature range | Determined jointly by face stock and adhesive layer | Inspect for brittle cracking/peeling after freezing at target temperature |
| Freeze–thaw cycle resistance | Stability through repeated exposure to low temperatures | Measure adhesion and legibility after multiple freeze–thaw cycles |
| Barcode readability | Contrast ratio after freezing | ISO/IEC 15416 scan grade evaluation |
| Peel strength | Adhesion between adhesive layer and surface | GB/T 2792-2014 peel test |
Complete Chain from Design to Verification
BradyLAB Lab series labels are systematically designed for extreme low-temperature scenarios, from face stock selection and adhesive formulation to print ribbon matching, and undergo three quality inspections—temperature resistance, adhesion, and printing—before leaving the factory. When selecting products, users should also rely on actual testing: perform freeze–thaw cycle verification at the target temperature, confirm that the peel-off rate and barcode readability grade meet requirements, and then proceed with bulk purchasing, thereby truly ensuring specimen traceability in extreme low-temperature environments.
Adhesive Technology Analysis of Extreme Low-Temperature Labels
The adhesive of a low-temperature label is the core factor determining whether it "stays adhered." The glass transition temperature (Tg) of ordinary pressure-sensitive adhesives is typically around -30 °C; once exposed to -80 °C or -196 °C environments, the adhesive layer enters a glassy state, losing flowability and adhesion, causing the label to peel off. Low-temperature specialty adhesives, through molecular chain design and plasticizing modification, lower the Tg to well below the service temperature, keeping the adhesive layer viscoelastic at extreme low temperatures.
Low-Temperature Synergistic Design of Face Stock and Adhesive Layer
The low-temperature performance of a label is the result of synergy between "face stock + adhesive layer," and the two must be designed to match: the face stock provides mechanical strength and the upper temperature limit, while the adhesive layer provides adhesion and low-temperature flexibility. For example, in liquid nitrogen scenarios, if PI face stock is used with an ordinary adhesive, the label will still peel off; the reverse is also true. Therefore, when evaluating low-temperature labels, both the face stock temperature range and the adhesive Tg should be examined.
Quantitative Indicators of Low-Temperature Label Performance
| Indicator | Meaning | Typical Requirement |
|---|---|---|
| Temperature range | Temperature range for long-term operation | Covers target storage temperature + margin |
| Freeze–thaw resistance | Stability after repeated temperature changes | ≥30–50 cycles |
| Barcode contrast ratio | Barcode black-and-white contrast | ≥80% (ISO/IEC 15416) |
| Peel strength | Peel force per unit width | Meets GB/T 2792-2014 |
Test-Driven Selection Methodology
There are no shortcuts in selecting extreme low-temperature labels; actual testing should be the core: define operating conditions → preliminary selection of face stock and adhesive layer → small-batch proofing → freezing at target temperature and freeze–thaw cycle testing → barcode and peel strength verification → bulk purchasing after all requirements are met. This methodology may seem cumbersome, but it exposes the vast majority of failure risks before bulk purchasing and is a reliable path to ensuring traceability of extreme low-temperature specimens.
Long-Term Stability of Extreme Low-Temperature Labels
In addition to resistance to -196 °C, extreme low-temperature labels also require attention to long-term stability: whether the adhesive ages during years of low-temperature storage, and whether the face stock slowly becomes brittle. It is recommended to establish a periodic re-scan system for long-term frozen specimens to detect and replace failed labels early, ensuring long-term specimen traceability.