Normal. Because some vulcanizing agents will be added in the production process of silica gel, otherwise there is no way to form it. So it will release a slight smell after passing through the temperature, but it is harmless to the human body, and it will be gone after a long time. It is not recommended if it smells good at room temperature.

Relevant explanation

Silicone tube is the circulation and coating carrier of liquid and gas. Silicone rubber pipes in the industry can be divided into "extrusion pipes" and "special pipes". Widely used in modern industry, national defense industry and daily necessities.

Silicone rubber tube is made by adding raw silicone rubber into a double-roll rubber mixer or a closed kneader, gradually adding white carbon black and other additives, repeatedly refining evenly, and extruding according to industrial product technical standards. Conductive silicone rubber for electronic industry.