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Common sealant profiles in the food industry are primarily customized based on material
Release Date:
2026-04-16
Author:
Application scenarios: flange gaskets for pharmaceutical equipment, high-purity fluid transfer pumps, and oil-containing food-processing machinery.
Common sealant profiles in the food industry are primarily customized based on material, cross-sectional shape, and the equipment in which they are used; standardized models are typically designated by material combined with structural configuration, such as food-grade silicone “O-rings,” EPDM “D-shaped strips,” and PTFE “flat gaskets.” These profiles not only meet physical sealing requirements but, more importantly, comply with food safety regulations, ensuring they are non-toxic, odorless, and resistant to high-temperature sterilization.
I. Common Models Classified by Material and Certification
Food-grade silicone sealing strip (VMQ)
Typical models: VMQ-230 (temperature resistance: -60°C to +230°C), FDA-VMQ (FDA-certified)
Features: non-toxic and transparent, excellent resilience, and customizable colors (e.g., red for warning zones).
Application scenarios: rice cooker door seals, oven sealing rings, baby bottle gaskets, and vacuum preservation equipment.
Compliance Standards: Compliant with GB 4806.11-2016 and FDA 21 CFR 177.2600
Ethylene Propylene Diene Monomer (EPDM) Rubber Sealing Strip
Typical models: EPDM-150 (temperature resistance: -50°C to +150°C), 3-A EPDM (compliant with 3-A sanitary standards)
Features: resistant to water vapor and aging, suitable for high-temperature cleaning environments.
Application scenarios: dairy filling valves, beverage production line piping, and steam sterilizer door seals.
Caution: Not suitable for fatty foods; swelling may occur.
Polytetrafluoroethylene (PTFE) sealing strip
Typical models: PTFE-260 (temperature resistance: -250°C to +260°C), GMP-PTFE (pharmaceutical grade)
Features: high chemical inertness, smooth surface, non-stick properties, and easy to clean.
Application scenarios: flange gaskets for pharmaceutical equipment, high-purity fluid transfer pumps, and oil-containing food-processing machinery.
Advantages: Certified to USP Class VI biocompatibility standards, making it suitable for direct contact with pharmaceuticals.
Nitrile Rubber Sealing Strip (NBR)
Typical models: NBR-100 (temperature resistance: -30°C to +100°C), FDA-NBR (food-grade certified)
Features: Excellent oil resistance and low cost.
Application scenarios: edible oil filling machines, food-processing gloves, and oily sauce packaging equipment.
II. Compliance Models Classified According to Industry Standards
GB 4806.11-2016 certification model: All rubber seals intended for food contact and sold in the Chinese market must bear this certification mark, such as “GB-FDA-VMQ”.
FDA-certified model: Sealing strips intended for export to European and American markets must be labeled “FDA Compliant,” which is commonly seen on silicone and PTFE products.
3-A sanitary standard model: used in the dairy and beverage industries, such as “3-A EPDM O-Ring,” which requires no dead corners and is easy to clean.
USP Class VI–certified models: Designed for pharmaceutical-grade sealing, such as “USP PTFE gaskets,” to ensure biosafety.
III. Practical Selection Recommendations
Prioritize models with certification marks: Verify that the product is labeled with compliance information such as FDA, GB, or 3-A.
Select the appropriate temperature rating based on the process temperature: for example, high-temperature baking lines should use VMQ-230 rather than standard rubber.
Consider media compatibility: for oil-based foods, avoid using EPDM; PTFE or fluororubber is recommended.
Customized Service Support: Most manufacturers offer custom fabrication based on drawings for non-standard models, such as specially shaped silicone strips and PTFE sealing tapes with adhesive backing.
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Small and Micro Enterprise Park in Wangguanzhuang Town, Qinghe County, Xingtai City, Hebei Province