Dairy Liner
What are Dairy Liners?
A Dairy Liner is a sanitary pipe fitting designed for hygienic connections in dairy, food, beverage, and pharmaceutical processing systems. It acts as a connector between pipelines and equipment, ensuring smooth, contamination-free flow. Dairy Liners are made of stainless steel with a polished, sanitary finish, making them resistant to corrosion and easy to clean.
Asaid Steel Industries is a trusted Dairy Liner supplier, offering premium-grade stainless steel liners with excellent finish, durability, and compliance with international hygienic standards.
Key Features
Leak-Proof
Jointing
Sanitary
Design
Easy to
Clean
Standards
Compliant
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Nominal Bore (NB) / Inner Diameter | ½” to 6” (DN15 – DN150), customized sizes available |
| Length | Standard: 50 mm – 300 mm, Customized on request | |
| Pressure Ratings | Working Pressure | Up to 10 bar (varies with thickness & material) |
| Vacuum Resistance | Designed for CIP/SIP vacuum conditions | |
| Fitting Types | Dairy Line Applications | ID/OD precision liners for bends, tees, reducers, valves, unions |
| Compatibility | Suitable for IDF/ISO/3A/DS dairy fittings | |
| Material Options | Elastomers | EPDM, Silicone, Nitrile (NBR), Viton (FKM) |
| Thermoplastics | PTFE (Teflon) liners for chemical resistance | |
| Certification Grade | FDA 21 CFR, USP Class VI, BfR Compliant | |
| Standards & Certifications | Dairy Standards | 3A Sanitary Standards, EHEDG Approved |
| International Standards | ISO 2852, DIN 32676 (Tri-Clamp) | |
| Quality Certifications | FDA, CE, ISO 9001:2015, EU 1935/2004 | |
| Design Features | Wall Thickness | 1.5 mm – 6 mm (material dependent) |
| Temperature Resistance | -40°C to +200°C (Silicone), -20°C to +120°C (EPDM), up to +250°C (PTFE) | |
| Hardness | 50 – 80 Shore A (elastomers) | |
| Surface Finish | Smooth, pore-free, hygienic finish (Ra ≤ 0.8 µm) | |
| End Connections | Compatible with dairy ferrules, gaskets, and clamp fittings | |
| Coating & Surface Finish | Special Properties | Anti-stick, low extractables, resistant to fat, milk acids, and cleaning agents |
| Color Options | White, Transparent, Blue (for food-grade traceability) | |
| Testing & Inspection | Mechanical Testing | Tensile, Hardness, Tear Resistance |
| Chemical Testing | FDA/USP compliance, Extractables & Leachables test | |
| Pressure Testing | Hydrostatic test under rated pressure | |
| Sterility Testing | CIP/SIP cycle validation, Autoclave compatible |
Dimensions
| Nominal Size (DN / ID) | Outer Diameter (OD) of Liner (mm) | Inner Diameter (ID) / Bore (mm) | Thickness (mm) | Compatible Ferrule OD (mm) | Standard |
|---|---|---|---|---|---|
| DN 10 (3/8″) | 22 | 10 | 3.0 – 4.0 | 34 | DIN 11851 / ISO |
| DN 15 (½”) | 28 | 15 | 3.0 – 4.0 | 34 | DIN 11851 / ISO |
| DN 20 (¾”) | 34 | 20 | 3.0 – 4.0 | 50.5 | DIN 11851 / ISO |
| DN 25 (1″) | 50.5 | 25 | 3.0 – 4.5 | 50.5 | DIN 11851 / ISO |
| DN 32 (1¼”) | 50.5 | 31.8 | 3.0 – 4.5 | 50.5 | DIN 11851 / ISO |
| DN 40 (1½”) | 50.5 | 38 | 3.0 – 4.5 | 50.5 | DIN 11851 / ISO |
| DN 50 (2″) | 64 | 50.5 | 3.0 – 5.0 | 64 | DIN 11851 / ISO |
| DN 65 (2½”) | 77.5 | 66 | 3.0 – 5.0 | 77.5 | DIN 11851 / ISO |
| DN 80 (3″) | 91 | 78 | 3.5 – 5.0 | 91 | DIN 11851 / ISO |
| DN 100 (4″) | 119 | 100 | 3.5 – 5.0 | 119 | DIN 11851 / ISO |
| DN 125 (5″) | 145 | 125 | 4.0 – 6.0 | 145 | DIN 11851 / ISO |
| DN 150 (6″) | 170 | 150 | 4.0 – 6.0 | 170 | DIN 11851 / ISO |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 7 – 15 (EPDM, Silicone), 20 – 35 (PTFE) | MPa (ASTM D412 / D638) |
| Yield Strength | 5 – 10 (Elastomers), 15 – 25 (PTFE) | MPa |
| Hardness | 50 – 80 (Shore A, Rubber), 50 – 65 (Shore D, PTFE) | Shore A / Shore D |
| Elongation | ≥ 200 – 600 | % |
| Density | 1.1 – 1.4 (Rubber), 2.1 – 2.3 (PTFE) | g/cm³ |
| Impact Toughness | High (non-brittle elastomers), Medium (PTFE) | Qualitative |
| Modulus of Elasticity (E) | 5 – 15 (Rubber), ~500 – 700 (PTFE) | MPa |
| Fatigue Strength | Excellent (Elastomers), Good (PTFE) | – |
| Corrosion Resistance | Excellent against milk, acids, alkalis, cleaning agents | – |
| Thermal Conductivity | 0.2 – 0.3 (Rubber), ~0.25 (PTFE) | W/m·K |
| Coefficient of Thermal Expansion | 150 – 310 ×10⁻⁶ (Rubber), 100 – 125 ×10⁻⁶ (PTFE) | /°C |
| Yield Ratio (YS/UTS) | 0.30 – 0.50 | – |
| Poisson’s Ratio | 0.45 – 0.49 (Rubber), 0.46 (PTFE) | – |
| Brinell Hardness Range | Not applicable (soft elastomers) | – |
| Surface Finish | Hygienic smooth finish, Ra ≤ 0.8 µm (food grade) | – |
| Sterilization Method | Steam, CIP, SIP, Autoclave | – |
| Operating Temperature Range | -40 to +120 °C (EPDM), -60 to +200 °C (Silicone), -200 to +250 °C (PTFE) | °C |
| Pressure Rating | Suitable for low to medium pressure dairy pipelines | ISO / DIN Dairy Standards |
Chemical Composition
| Element | SS 304 (%) | SS 304L (%) | SS 316 (%) | SS 316L (%) |
|---|---|---|---|---|
| Chromium (Cr) | 18.0 – 20.0 | 18.0 – 20.0 | 16.0 – 18.0 | 16.0 – 18.0 |
| Nickel (Ni) | 8.0 – 10.5 | 8.0 – 12.0 | 10.0 – 14.0 | 10.0 – 14.0 |
| Carbon (C) | ≤ 0.08 | ≤ 0.03 | ≤ 0.08 | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 |
| Iron (Fe) | Balance | Balance | Balance | Balance |
| Molybdenum (Mo) | — | — | 2.0 – 3.0 | 2.0 – 3.0 |
Applications of Dairy Liner
Dairy & Milk Processing
Units
Beverage Plants
Pharmaceutical
Food Processing &
Edible Oil Units
Chemical & Enzyme
Production
Dairy R&D and Quality
Testing Labs
Do you have questions?
What is the purpose of a Dairy Liner?
Which material is preferred for Dairy Liners?
Are Dairy Liners easy to clean?
Do Dairy Liners meet international standards?
