The technical specifications of food covers primarily encompass material, dimensions, temperature resistance, sealing performance, and service life. Common covers are made from materials such as food-grade PP plastic, PE plastic, or silicone; these materials must be safe, non-toxic, and compliant with standards for food-contact products. Additionally, the products should offer good transparency or flexibility, allowing for easy monitoring of the food inside while enhancing convenience during daily use.
Food covers are typically designed to accommodate various tableware sizes-commonly categorized as small, medium, and large-making them suitable for containers such as bowls, plates, and cups. Some products feature elastic edges or expandable designs, enabling them to fit tableware of various shapes and sizes; this improves the fit and sealing capability, thereby minimizing the ingress of air, moisture, and odors.
Temperature resistance is another key technical indicator. Standard plastic covers generally offer a degree of cold and heat resistance, making them suitable for refrigerator storage and everyday use. Products made from high-temperature-resistant materials can withstand higher temperatures; however, users should adhere to the product's specific usage guidelines to prevent deformation or damage caused by exceeding temperature limits.
Food covers must also possess adequate structural strength and durability. They should exhibit good resistance to stretching and deformation, maintaining their sealing effectiveness even after repeated use. During production, checks regarding appearance, dimensional accuracy, sealing performance, and material safety are essential to ensure the product meets established technical standards and satisfies consumers' long-term usage needs.