K1491 Kipp Hygienic USIT® seal and shim washers

Hygienic USIT Technical Information EHEDG EL Class Certificate

With its highly reliable sealing and design that is compliant with hygiene requirements, the Hygienic USIT® seal and shim washer is setting new standards for cleanliness in the process industry. Many manufacturers of machinery and systems for the food and pharmaceutical industries often use standard shim washers or O-rings for screw connections in or on the product chamber. These are not EHEDG-compliant, however, as contamination and biofilms in the form of bacteria colonies and corrosion can form under the screw head, preventing the design from achieving maximum hygiene standards.

The metallic shim washer with a fixed sealing ring made from 70 EPDM 291 (black) or 70 EPDM 253815 (white) provides a secure, cavity-free seal. The Hygienic USIT® seal and shim washer, made from the fluorinated premium compound Fluoroprene® XP 45, is suitable for applications involving particularly aggressive CIP/SIP cleaning temperatures, high steam sterilisation temperatures and process media containing grease. This material has an even larger operating temperature range and is resistant to polar and non-polar media as well as flavouring substances.

Approvals such as FDA, EU1935/2004 and USP Class VI (121°C), plus EHEDG certification, confirm that the Hygienic USIT® washer represents the ideal choice for hygienically demanding applications in the food, beverage and pharmaceutical industries.

• Material: Washer – 316 grade stainless steel (European equivalent: 1.4404), also known as “marine grade”, Sealing ring – 70 EPDM 291 (black), 70 EPDM 253815 (white), 75 Fluoroprene® XP 45 (blue).
• Note: The EHEDG certificate is only valid when a specifically matched hexagon head bolt K1492 or cap nut K1493 is used.
• Attention: The function of the Hygienic USIT® screw connection system has been tested in combination with stainless steel materials and standard cleaning materials. The user must check that it is suitable for the application in question.
• Accessory: The Hygienic USIT® seal and shim washers can be used with all other products of the Hygienic USIT® range.

• Kipp STAINLESS STEEL products: Products marked with this symbol are made from 316 grade stainless steel, also known as marine grade stainless steel, providing exceptional corrosion resistance and hygienic performance. Equivalent to European grade 1.4404, this premium alloy is specifically designed for demanding environments where cleanliness, durability, and chemical resistance are essential.
• Kipp HYGIENIC products:

  Made from 316 grade stainless steel (also known as marine grade, equivalent to 1.4404), Kipp HYGIENIC range delivers outstanding corrosion resistance and hygiene. Ideal for the food, pharmaceutical, chemical, and packaging industries, 316 stainless steel offers long-lasting strength, easy cleaning, and resistance to harsh environments. Hygienic DESIGN – The new standard. Hygienic USIT® – The innovation in the processing industry