How Label Durability Is Tested and What It Tells You

The durability of a label essentially refers to its ability to "maintain its integrity, clarity of information, and secure attachment" in practical usage scenarios. Whether it's long-term labeling for outdoor equipment, recyclable labels for the food cold chain, or wear-resistant labels in industrial workshops, durability directly determines whether the label can fulfill its core mission of information transmission. Many people may wonder, "How do we judge whether a label's durability is sufficient?" and "Are the evaluation criteria for labels in different scenarios the same?" In fact, evaluating label durability does not require complex professional equipment. The core lies in verifying from several key dimensions centered around "usage environment" and "usage requirements". Today, let's break down these evaluation methods to help you easily determine whether the durability of a label meets the standard.

1. Clarify before evaluation: two core prerequisites are essential

Before evaluating the durability of labels, it is essential to clarify two key issues to ensure that the evaluation results are more aligned with practical needs and avoid unnecessary efforts:

1. Clarify the usage scenario: First, determine the environment in which the label will be used - is it a high-temperature workshop, a low-temperature cold chain, or an outdoor environment with strong ultraviolet radiation? Will it come into contact with water, oil, or chemical reagents? Is there frequent friction or collision? Different environments pose completely different challenges to durability;

2. Clarify the usage cycle: How long does the label need to be stably used? Is it for a short period of 3 months, a long period of over 1 year, or even 5 years? The usage cycle directly determines the evaluation criteria for durability. For example, labels used for short periods have much lower requirements for weather resistance compared to those used for long periods.

II. Core evaluation dimension 1: Environmental tolerance - the ability to "resist" different environments

Environment is the primary factor affecting the durability of labels, and different environments require different evaluation methods. The core is to simulate the long-term performance of labels in actual environments.

1. High and low temperature resistance assessment: Simulate extreme temperature testing

Suitable scenarios: high-temperature workshops, outdoor exposure, cold chain warehouses, refrigerated transportation, etc.

Evaluation methods: ① High-temperature test: Place the label sample in a constant temperature chamber and set the actual maximum temperature for use (such as 150°C in an industrial workshop or 60°C in outdoor summer conditions). Maintain the sample at this temperature for a specified duration (3 days for short-term testing or 7 days for long-term testing). After removal, observe whether the label has yellowed, deformed, shrunk, or if the adhesive layer has softened or fallen off, and whether the printed information remains legible. ② Low-temperature test: Place the label in a low-temperature chamber and set the actual minimum temperature (such as -40°C for cold chain or 0°C for refrigeration). Maintain the sample at this temperature for a specified duration and then remove it. Observe whether the label has become brittle, its flexibility has decreased, or if the adhesive layer has hardened and lost its tackiness. ③ High-low temperature cycle test: Simulate diurnal temperature variations or a freeze-thaw cycle (such as placing at -20°C for 2 hours, then at 23°C for 2 hours, repeating this 10 times). Observe whether the label exhibits warping, damage, or adhesive failure.

Judgment criteria: If the label shows no obvious deformation or damage after testing, the adhesive layer does not fall off, and it remains firmly attached, with the printed information being clear and legible, it is considered to meet the standard.

2. Moisture/Water Resistance Assessment: Coping with Water Vapor Erosion

Suitable for: Food processing workshops, aquatic product workshops, outdoor rainy days, bathrooms, and other environments that are humid or contain moisture.

Evaluation methods: ① Constant temperature and humidity test: Place the label in a constant temperature and humidity chamber, set the humidity (such as 85%RH) and temperature to match the actual environment, and leave it for 7 days. Observe whether the label softens, molds, warps, or the printing blurs; ② Water immersion test: Immerse the label completely in clean water (if it will actually come into contact with saltwater or oil, replace with the corresponding liquid), and remove it after soaking for 24-72 hours. Observe whether the label dissolves, breaks, the adhesive layer detaches, and whether it can still adhere firmly after drying.

Judgment criteria: If the label remains soft, mold-free, and undissolved after testing, with a stable adhesive layer and no blurring of printed information, it is considered to meet the standard.

3. UV resistance/outdoor weatherability assessment: addressing outdoor exposure aging

Suitable for scenarios: outdoor advertising, open-air equipment signage, traffic signage, and other settings that are exposed to sunlight for extended periods.

Evaluation method: Utilize an ultraviolet aging test chamber to simulate outdoor ultraviolet exposure (with an intensity of approximately 0.5W/m²) for a duration of 100-500 hours (100 hours is equivalent to approximately one month of outdoor exposure). During this period, regularly observe the changes in the label.

Criteria for judgment: After testing, if the label does not turn yellow, crack, or powder, the adhesive layer does not age or fail, and the fading rate of printed information (especially color patterns) does not exceed 10%, it is considered to meet the standard. If professional equipment is not available, the label can also be placed outdoors for 1-3 months and its actual performance can be observed regularly.

4. Chemical Resistance Assessment: Handling Special Chemical Environments

Suitable for use in chemical workshops, pharmaceutical production facilities, laboratories, and other environments where exposure to acids, alkalis, solvents, and oils may occur.

Evaluation method: Based on the actual chemical substances encountered, immerse the labeled sample in the corresponding solution (such as 5% hydrochloric acid, 5% sodium hydroxide solution, industrial alcohol, or cooking oil) for 24 hours. After immersion, remove the sample and observe whether the label is damaged or dissolved, if the adhesive layer has detached, and if the printed information remains legible.

Criteria: If the label remains intact without damage or dissolution after testing, the adhesive layer maintains stable viscosity, and the printed information is clear, it meets the standard.

II. Core Evaluation Dimension 2: Physical Resistance - Resistance to Friction, Impact, and Sticking during Use

In addition to environmental erosion, labels may also encounter physical damages such as friction, collision, and tearing during use, which is also an important dimension in evaluating durability.

1. Friction resistance evaluation: addressing daily friction and wear

Suitable scenarios: labels for frequently accessed goods, labels for industrial equipment operation panels, labels for logistics turnover boxes, etc.

Evaluation Method: Utilize a friction tester (or a simple wear-resistant testing tool) and apply a standard friction cloth (or regular cotton cloth) to rub back and forth on the label surface (with a pressure of 500g and a speed of 30 times per minute). After rubbing for 100-500 times, observe whether the label surface is worn and whether the printed information remains legible. If equipment is not available, cotton cloth can be used to manually rub back and forth for the same number of times.

Judgment criteria: If there are no visible scratches or wear on the label surface after friction, and the printed information remains clear and does not peel off, it is considered to meet the standard.

2. Adhesion stability assessment: long-term adhesion without detachment or warping

Suitable for all labeling scenarios requiring long-term adhesion, the core assessment is the durability of the adhesive layer.

Evaluation Method: Attach the label to the surface of the actual object being used, roll it back and forth twice with a 2000g roller to ensure complete adhesion without bubbles, then place it in the actual usage environment and regularly observe whether the label warps, edges fall off, or the overall position shifts. A hanging adhesion test can also be conducted: hang the attached label vertically, suspend a 1kg weight at the free end, and record the time it takes for the label to show a 10mm displacement.

Judgment criteria: After being placed in the actual environment for 1-3 months, the label should show no signs of lifting, peeling, or displacement; in the hanging adhesion test, the time during which the label displacement does not exceed 10mm should be ≥24 hours (for long-term use labels, it is recommended to be ≥72 hours), which is considered to meet the standard.

3. Tear/impact resistance assessment: addressing accidental damage

Suitable for scenarios: logistics transportation labels, outdoor equipment labels, children's product labels, and other scenarios where collision or tearing may occur.

Evaluation methods: ① Tear resistance test: Cut the label into standard strips and use a tensile testing machine to test the tear strength of the label (or manually gently tear the edge of the label to observe whether it is easy to tear); ② Impact resistance test: Place the labeled object on a vibration table simulating transportation and subject it to vibration for 2 hours (or manually repeatedly impact and shake it), observing whether the label is damaged or falls off.

Judgment criteria: In the tear resistance test, the tear strength of the label meets the usage requirements (e.g., industrial labels ≥ 5N); if the label remains intact and does not fall off after the impact test, it is considered to meet the standard.

III. Core Evaluation Dimension 3: Print Stability - Long-term Clearness and Non-Loss of Information

The core function of labels is to convey information. Even if the label itself remains intact, the fading or blurring of printed information indicates a loss of durability, a point that is often overlooked.

Evaluation Method: Combining previous environmental and physical tests, focus on observing the state of printed information after testing - such as whether the text, barcodes, and patterns remain clear after high-temperature, ultraviolet, and friction tests, and whether there is any fading, bleeding, or peeling; use a barcode scanner to test the scanning rate of the barcodes to determine whether the information can be recognized normally.

Criteria: After undergoing various durability tests, if the printed information is clear and legible, and the barcode scanning rate is ≥95% (≥99% for high-precision demand scenarios), it is considered to meet the standard.

IV. Assessment Focuses for Different Scenarios: Targeted Judgment for Higher Efficiency

There is no need to conduct a comprehensive evaluation of all tags. Instead, targeted testing of key dimensions based on specific scenarios is sufficient:

1. Outdoor long-term labels: The key assessment criteria include UV resistance, temperature resistance, moisture resistance, and adhesion stability;

2. Cold chain labeling: The key assessment focuses on low temperature resistance, high and low temperature cycling, and adhesion stability (under condensation conditions);

3. Industrial workshop labels: Emphasis is placed on evaluating resistance to high temperatures, chemical corrosion, friction, and impact;

4. Logistics turnover label: Focus on evaluating friction resistance, adhesion stability, and tear resistance;

5. Food packaging label: The key assessment focuses on moisture resistance, grease resistance, and printing stability (meeting food-grade standards).

The core logic of evaluating label durability is actually quite simple: place the label in a "simulated real-world usage environment" and observe whether it can maintain "integrity of form, secure adhesion, and clear information" within a specified period. If you do not have professional testing equipment, you can also seek assistance from a professional manufacturer for evaluation - for example, Xuzhou Huaishi will build a customized simulation environment based on your usage scenario, conduct a full set of durability tests on the label, issue a detailed test report, and optimize the label's surface material, adhesive layer, and printing process based on the test results to ensure that the label's durability fully meets your needs. If you have related evaluation or customization requirements, feel free to contact us for specific solutions.