An EC 1935/2004 O-ring is a type of sealing ring that is designed to meet the requirements of the European Union’s food contact regulations.

The EC 1935/2004 O-ring is made from materials that meet the EU’s food contact regulations. These regulations specify that materials used in contact with food must not transfer harmful substances to the food, must not affect the taste or smell of the food, and must not be harmful to human health. The O-ring must also be able to withstand the temperature and chemical conditions of the food processing and storage environment.

The materials used to make EC 1935/2004 O-rings include a range of elastomers that have been specifically tested and approved for use in food contact applications. These elastomers include silicone, EPDM, and fluorocarbon (FKM) materials. These materials have different properties that make them suitable for different food processing and storage environments.

Silicone O-rings are often used in high-temperature applications, such as baking and sterilization processes, as they can withstand temperatures up to 200°C. They are also resistant to many chemicals used in food processing and are known for their excellent sealing properties.

EPDM O-rings are suitable for low-temperature applications, such as refrigeration and freezing, as they can withstand temperatures as low as -40°C. They are also resistant to steam and other cleaning agents used in food processing environments.

FKM O-rings are used in applications where chemical resistance is required, such as in contact with acidic or alkaline food products. They can also withstand high temperatures and are often used in applications where silicone O-rings are not suitable.