As the core carrier for the storage and transportation of high-end caviar, the rubber seal caviar tin is based on food-grade materials and integrated with precision sealing technology. It balances freshness, safety and practicality, and is suitable for the low-temperature storage, long-distance transportation and daily display of various caviars (sturgeon roe, salmon roe, etc.). Its performance parameters have been strictly tested and optimized to fully protect the original flavor and quality of caviar. The detailed parameters are as follows.

　　I. Basic Specification Parameters

　　The tank specifications cover the mainstream caviar packaging needs, support customized production, adapt to different capacity scenarios, and balance practicality and aesthetics. The specific parameters are as follows:

　　Tank Material: Food-grade tinplate, complying with REACH, EN71-1/2/3 and FDA food contact safety standards, odorless, no heavy metal precipitation, corrosion-resistant and not easy to deform. It can not only effectively isolate external temperature and light, but also avoid the impact of tank oxidation on caviar quality. The thickness is 0.23-0.28mm, the tensile strength is ≥280MPa, and the elongation rate is ≥30%, ensuring the tank is stable and durable, not easy to damage.

　　Sealing Rubber Material: Food-grade silicone, certified by FDA, LFGB, REACH and ROHS, free of harmful substances such as BPA and phthalates. It is soft in texture, excellent in elasticity, not easy to age and deform, and has excellent high and low temperature resistance. It can be directly in contact with caviar without affecting the original flavor and taste of caviar. At the same time, it has good chemical inertness, does not react with caviar, and comprehensively protects food safety.

　　Capacity Specifications: Regular specifications include 50g, 125g, 250g, 500g, 1000g and 1700g. Special capacities can be customized according to customer needs. The height and diameter of the tank are accurately adapted to the capacity design, and the tank mouth size is perfectly matched with the sealing rubber to avoid air and liquid leakage caused by excessive sealing gaps. It is suitable for packaging and use in different scenarios, whether it is small-family storage or commercial bulk packaging.

　　Tank Dimensions: 50g specification (diameter 58mm × height 28mm), 125g specification (diameter 72mm × height 35mm), 250g specification (diameter 85mm × height 42mm), 500g specification (diameter 100mm × height 50mm), 1000g specification (diameter 120mm × height 60mm), 1700g specification (diameter 150mm × height 70mm). The dimensional deviation is ≤±0.2mm, with high precision, which is convenient for stacking, transportation and display, saves storage and transportation space, and improves use convenience.

　　Appearance Process: The tank adopts matte frosted or bright film coating process, no burrs, no scratches, clear printing and not easy to fall off. Logos, product information and patterns can be customized, balancing practicality and ornamental. It can not only protect the tank from wear and tear, but also improve the high-end texture of the product, adapting to the aesthetic needs of high-end food packaging. At the same time, the red rubber seal can be matched with the traditional blue tank to add visual layering and elegance.

　　II. Core Sealing Performance Parameters

　　Sealing performance is the core to ensure the freshness of caviar. The rubber seal design has been precisely calculated to ensure that air tightness and water tightness meet the standards, effectively isolating air, moisture and external impurities, and extending the shelf life of caviar. The specific parameters are as follows:

　　Sealing Method: An annular rubber sealing ring is built into the tank mouth, adopting an embedded sealing structure, which fits closely with the tank mouth. Combined with the tank cover compression design, it provides double sealing protection, eliminating air and liquid leakage, ensuring the stability and reliability of the seal, avoiding caviar oxidation and deterioration caused by air entry, and preventing leakage during transportation, comprehensively protecting caviar quality.

　　Air Tightness: At 25℃ and standard atmospheric pressure, the air tightness test is carried out, the pressure is maintained at 0.05MPa, no air leakage and no pressure drop for 24 hours, and the leakage rate is ≤0.01mL/min. It can effectively isolate air, prevent caviar oxidation and deterioration, lock the original freshness and nutrients of caviar, ensure that each portion of caviar maintains the best taste, which is also one of the key guarantees for long-term caviar storage.

　　Water Tightness: At room temperature, immerse the sealed tank in clean water with a depth of 50cm, no water seepage or leakage for 24 hours. It can effectively prevent external moisture from entering the tank, avoid caviar dampness and deterioration, and also prevent caviar leakage in the tank. It is suitable for humid storage environments such as refrigeration and freezing, expanding the applicable scenarios of the product and meeting the needs of different storage conditions.

　　Sealing Temperature Resistance: Within the temperature range of -40℃~230℃, the sealing performance remains stable. The rubber sealing ring does not shrink, harden or crack, and can still fit closely with the tank mouth. It is suitable for different storage scenarios such as refrigeration (-18℃~0℃) and room temperature (0℃~25℃). Whether it is low-temperature fresh-keeping storage of caviar or short-term room temperature display, it can ensure that the sealing effect does not decay, and ensure the stable quality of caviar.

　　Sealing Durability: After more than 500 times of repeated opening and closing, the sealing performance does not significantly decay. The rubber sealing ring has no deformation, damage or aging, and the service life is ≥3 years. It can be reused, which is both environmentally friendly and economical. It is suitable for scenarios of repeated opening and closing. Whether it is daily access at home or repeated opening during commercial display, it can maintain a good sealing effect, reduce use costs and improve practicality, in line with the concept of sustainable development.

　　III. Material Performance Parameters

　　The material performance of the tank and rubber seal directly determines the product safety and durability. All materials have been strictly tested and meet food-grade standards. The specific parameters are as follows:

　　(I) Tank Material Performance

　　Corrosion Resistance: At room temperature, contact with weak acid and weak alkaline substances (such as trace acidic components contained in caviar itself) has no corrosion, rust or deterioration, which can effectively protect the caviar in the tank from the influence of the tank material, ensure the purity and taste of caviar, avoid impurity mixing caused by tank corrosion, comprehensively protect food safety, and adapt to the storage needs of various caviars. It will not react with caviar to affect quality