High (Low) Temperature Resistant Labels
The main condition for temperature-resistant labels is the type of adhesive used. Regular adhesives lose their stickiness at extreme temperatures, so special adhesive materials are required for particularly high or low temperature environments.
High-temperature resistant labels: The first level of high-temperature resistance is above 100°C, typically used for microwave food packaging or the surface of steam boilers. Temperatures above 200°C usually reach the ignition point of materials, so the duration of temperature resistance needs to be confirmed. There is a difference between a few minutes of resistance and long-term resistance.
PI labels: PI polyimide (POLYMIDE) can withstand both high and extremely low temperatures (-269~400°C), and is usually used in electronic products, circuit boards, or aerospace materials. However, due to its specialized technology and materials, the price is also high.
Vulcanization labels: Tires undergo a vulcanization process during manufacturing to make the rubber more stable and durable. Vulcanization labels can withstand high-temperature vulcanization (200°C) processes and cannot be separated from the rubber after vulcanization.
Low-temperature resistant labels: In low-temperature environments, apart from temperature, serious moisture issues may also arise. Therefore, in addition to the adhesive needing to withstand low temperatures, the face material should also be waterproof. General refrigeration temperatures are about 0-7°C, freezing temperatures are about -15~-20°C, and professional freezing equipment can go below -40°C.
Precautions for Using Freezer Labels
Freezer labels can retain their stickiness and not fall off in low-temperature environments.
Labels need to be applied before freezing: After freezing, frost easily forms, and if the frost or moisture on the surface is not cleaned, the labels will not stick firmly.
The surface to be labeled must be flat: When used for sealing purposes, bottle caps are often uneven or the label may be suspended, which can cause the label to lift.
Non-toxic Labels (For Food Packaging)
High (low) temperature resistance sometimes comes with food-grade requirements. However, food-grade labels are extremely rare on the market, so labels that comply with EU RoHS non-toxic certification are usually used instead.
Waterproof Labels
Splash-proof: Only prevents small amounts of water from splashing on the label or frost caused by freezing. In this case, "art paper" can be used as it has better water absorption than regular paper. Additionally, regular coated paper with lamination or varnish can also have some waterproof properties.
Soak-proof: For labels that need to be fully submerged in water, plastic material labels are required. For example, "synthetic paper," "pearl paper," "PET labels ," "PVC," etc. "Tyvek paper" is also a plastic material but has a paper-like texture with fibers on the surface, often used for higher-priced products or wine labels.
Freezer Waterproof Cartons
Many labels are made of plastic material rather than "paper," but cartons are rarely made of plastic material, making it difficult to achieve waterproof functionality, especially when meeting environmental protection or plastic reduction requirements. We recommend printing a waterproof coating on the surface layer of the carton, which avoids the problem of adding plastic material with a protective film. For more details, see: Waterproof Cartons for Frozen (Low-Temperature Delivery) | Eco-Friendly Uncoated Cartons
Outdoor Sunlight Resistant and Anti-Fading Labels
If the label will be used outdoors, in addition to being waterproof and temperature resistant, issues such as ink fading and material aging should also be considered. For more details, see this article: Weather-Resistant (Lightfast) Fade-Resistant Stickers | Halogen Lamp UV-Resistant Paper Box | Solutions for Outdoor Sticker Fading
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