Hygienic IDF Unions BS 4825 Part 4

The IDF (International Dairy Federation) union, standardized under BS 4825 Part 4, is a heavy-duty hygienic fitting designed specifically for CIP (Clean-in-Place) systems.

Unlike RJT unions, the IDF features a flush internal bore that eliminates crevices, preventing bacterial growth. It uses a distinctive Acme thread and a T-shaped gasket. While highly reliable for permanent lines, its fine threads can be prone to galling if handled roughly during frequent manual teardowns.

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The IDF (International Dairy Federation) union, governed by BS 4825 Part 4, is the "heavy-duty" sibling to the RJT. It is specifically engineered for high-integrity Clean-In-Place (CIP) environments where a smooth, crevice-free internal flow is mandatory to prevent product entrapment.

Technical Attributes: IDF Unions

Standard,BS 4825 Part 4 (ISO 2853)

Thread Type,"Acme Thread (Flat-topped, high strength)"

Internal Profile,Flush-fit / Crevice-free (Ideal for CIP)

Primary Material,"316L Stainless Steel (Wetted), 304 (Nuts)"

Size Range,"1.0"" to 4.0"" (OD tube sizes)"

Seal Type,T-Section Gasket (Interlocking design)

Seal Materials,"Nitrile, EPDM, Viton, or PTFE"

Max Pressure,Up to 16 Bar (230 psi) - Size dependent

Temp Range,Up to 140°C (depending on seal material)

Joint Style,Hexagon Nut with Weld Liner/Male

Installation,Butt-Weld or Expanded (Rolled)