BLOG

A large grocery and daily necessities brand came to us last year with a widespread customer issue their sold glass jars had poor sealing performance which caused the stored dry goods to absorb moisture easily the grains became clumpy the nuts turned soft and the dried fruits lost their taste leading to a high product return rate and negative customer feedback. Combining our rich production and R&D experience in glass storage products we upgraded the glass jars with a multi-layer sealing structure and provided customers with a detailed guide on proper sealing and use. After launching our upgraded airtight glass jars the brand’s customer complaints about moisture absorption dropped to zero within three months and the repurchase rate of glass jars increased by 50%. This experience made it clear that tight sealing is the core function of glass jars for storing dry goods and a professional sealing design can fundamentally solve the moisture absorption problem of stored items. Every glass jar we produce is manufactured with a high precision sealing structure strict quality control and excellent airtight performance which can effectively isolate external moisture and keep the stored items dry and fresh for a long time.

The most core design to make glass jars seal tightly and prevent moisture absorption is the multi layer silicone seal design which forms a solid moisture proof barrier between the jar body and the lid to isolate external humid air completely. Our glass jars are equipped with food grade silicone seal rings of high quality the seal rings are designed with double or triple layered convex strips that fit closely with the jar mouth and the lid when the lid is tightened the convex strips of the seal ring are compressed to fill all the gaps between the jar and the lid. This multi layer seal design complies with the international airtightness test standards certified by authoritative institutions the airtightness performance is far higher than that of ordinary single layer seal glass jars and can effectively block the entry of external moisture and air. Food storage experts emphasize that the quality and structure of the seal ring directly determine the sealing effect of glass jars a well designed silicone seal ring is the key to preventing stored items from absorbing moisture. Our silicone seal rings are made of high temperature resistant and aging resistant materials which can maintain good elasticity and sealing performance for a long time and are easy to disassemble and clean without deformation or cracking.

A threaded lid with a tight locking structure is an important guarantee for glass jars to maintain a tight seal for a long time which can keep the seal ring in a compressed state and avoid the seal failure caused by loose lids due to external factors. Our glass jars adopt a precision machined threaded lid design the threads of the lid and the jar mouth are perfectly matched with clear and smooth rotation and the lid can be tightened to a fixed position with a clear sense of locking. The edge of the lid is designed with anti slip convex points which increase the friction between the hand and the lid making it easier for users to tighten the lid to the optimal sealing state. Unlike ordinary glass jars with snap on lids that are easy to loosen our threaded locking structure can maintain a stable and tight seal even when the glass jar is shaken or placed upside down which effectively prevents moisture from entering through loose gaps. The threaded structure of our glass jars is made of high quality materials with high wear resistance and will not appear thread slipping or loose after repeated use which ensures the long term stability of the sealing effect.

A smooth and flat contact surface between the jar mouth and the lid is a basic design to ensure the tight sealing of glass jars which can make the seal ring fit with the jar and the lid more closely and eliminate the micro gaps that cause moisture infiltration. Our glass jars are made of high quality borosilicate glass with a one piece forming process the jar mouth is polished multiple times with high precision to achieve a mirror smooth effect with no burrs unevenness or small pits. The contact surface of the lid with the jar mouth is also processed with the same high precision smooth technology which ensures that the seal ring is in full contact with the jar mouth and the lid when the lid is tightened. Packaging industry experts point out that the flatness and smoothness of the contact surface directly affect the fitting degree of the seal ring even a tiny unevenness will form a micro gap and cause moisture to enter the jar slowly. Our strict processing standards for the contact surface ensure that the glass jar has an excellent sealing foundation and the multi layer seal ring can play its best effect on this basis to completely block moisture.

Even with a professionally designed sealed glass jar correct sealing and daily maintenance methods are needed to maintain its long term airtightness and prevent the stored items from absorbing moisture due to improper use. We recommend that users clean and dry the jar mouth the lid and the seal ring thoroughly before using the glass jar to store items no water stains or food residues are allowed on the contact surface otherwise the fitting degree of the seal ring will be affected and the sealing effect will be reduced. When tightening the lid users should rotate it evenly until a clear locking sense is felt do not use excessive force to avoid damaging the thread or the seal ring and do not tighten it too loosely which will cause air leakage and moisture absorption. For daily maintenance the seal ring should be disassembled and cleaned regularly to remove the dirt and food residues in the gaps and the glass jar should be stored in a dry and ventilated place to avoid the seal ring being damp and aging. Our after sales team also provides a detailed maintenance manual for each glass jar product which guides users to maintain the sealing performance of the glass jar correctly and ensure that the stored items are always in a dry environment.