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Food-grade CIP flexible connector for vibrating sifters. Formulated for enhanced hydrolysis resistance in 85°C hot caustic washdown. FDA 21 CFR compliant.
Entity-Dense Summary: The PU-15-CIP is a 1.5 mm polyether TPU flexible connector engineered for daily clean-in-place (CIP) washdown at 85°C. Food and pharmaceutical lines rely on aggressive acids, caustic soda (sodium hydroxide), and disinfectants to maintain sanitary paths. While standard TPU swells, yellows, and embrittles under these conditions, the PU-15-CIP is formulated for enhanced hydrolysis resistance. It survives alternating acid/alkali cycles while maintaining a smooth, drainable bore, high transparency, and full FDA 21 CFR 177.2600 compliance.
Q: Why does a standard sleeve fail under hot caustic CIP?
A: Hot caustic, nitric acid, and chemical disinfectants attack the ester or urethane bonds in standard polymers. Through hydrolysis, the material breaks down—it visibly yellows, swells, and fogs. Within weeks, the standard TPU loses its mechanical strength and tears at the flex point.
Q: How do legacy manufacturers address this CIP failure?
A: Most suppliers offer a compromise, not a solution. They advise plants to lower cleaning chemical concentrations, shorten wash cycles, or simply accept high maintenance costs with frequent sleeve replacements. This compromises your validated cleaning protocols. The PU-15-CIP fixes the chemistry itself, allowing you to run your required CIP cycles without rapid material degradation.
A sleeve can pass a one-time wash test and still fail in production. The real test is repeated daily CIP cycles: hot caustic, rinse, acid, rinse, hot again.
To prove our formulation, the PU-15-CIP material underwent a 120-hour alternating acid and hot alkali soak test.
| EXPOSURE RESULT | STANDARD TPU SLEEVE | THE PU-15-CIP |
| Visual Appearance | Severe yellowing, surface fogging | Maintained high transparency and brightness |
| Structural Integrity | Swelled, dissolved, easily torn | Retained original form, no swelling |
| Mechanical Strength | Massive drop in tensile strength | Retained 40 MPa tensile / 600% elongation |
The PU-15-CIP proves that you do not need to sacrifice physical toughness for chemical resistance.
CIP is only effective if the cleaning fluid reaches every surface and drains fully. Swelled or degraded connectors create crevices that trap residue — becoming a contamination source for the next batch. The PU-15-CIP maintains a smooth, flush, drainable bore. No dead zones, no trapped powder, no residue build-up.
| PROPERTY | PU-15-CIP VALUE |
| Material | CIP-grade polyether TPU, enhanced hydrolysis resistance |
| Wall thickness | 1.5 mm |
| Colour | Transparent (clear), resists yellowing |
| Washdown rating | Daily hot caustic/acid CIP at 85°C |
| Continuous Temp Limit | −20°C to +110°C |
| Tensile Strength | 40 MPa |
| Elongation at Break | 600% |
| Pressure / Vacuum | [To Be Confirmed] |
| Bore | Smooth, flush, drainable |
| Installation | Tool-free snap-in, <30 sec per end |
| Food contact | FDA 21 CFR 177.2600 (Report TQT4821B36E) EC 1935/2004 & EU 10/2011 |
PU15CIP - D{Ø} - CL{length}
Example: PU15CIP-204-300 = Ø204 mm × 300 mm, CIP-grade.
Standard sizes range from Ø102–804 mm × 100–1000 mm. View the full matrix in our Standard Size Database.
| YOUR SITUATION | CHOOSE |
|---|---|
| Daily hot caustic/acid CIP at 85°C | PU-15-CIP |
| Frequent product changeover with aggressive washdown | PU-15-CIP |
| Standard washdown, no hot caustic | PU-10 Standard Flexible Connector |
| Abrasive powder + CIP | PU-15 Heavy-Duty (Contact engineering to confirm CIP cycle) |
Q1: What is a CIP flexible connector?
A: A CIP (Clean-In-Place) flexible connector is a sanitary sleeve designed to withstand harsh cleaning chemicals (like sodium hydroxide and nitric acid) and high washdown temperatures without degrading, while featuring a perfectly smooth internal bore to prevent residue trapping.
Q2: Can a standard TPU flexible connector handle hot caustic cleaning?
A: No. Standard TPU will hydrolyze, swell, and yellow rapidly in hot caustic and acid environments. A CIP-grade TPU, like the PU-15-CIP, is engineered with a specific molecular structure to resist this chemical attack.
Q3: Will the PU-15-CIP yellow after CIP?
A: It is formulated specifically to resist the chemical hydrolysis that causes rapid yellowing and fogging. In 120-hour alternating soak tests, it maintained high transparency compared to standard urethanes.
Q4: Does the chemical resistance reduce its physical strength?
A: Not with this formulation. Even with enhanced chemical resistance, the PU-15-CIP maintains a robust 40 MPa tensile strength and 600% elongation at break, ensuring it easily handles the dynamic movements of vibrating sifters.
Q5: Is it food-contact compliant?
A: Yes. It is FDA 21 CFR 177.2600 compliant (Report TQT4821B36E) and formulated in accordance with EC 1935/2004 and EU 10/2011.
Stop letting failing connectors dictate your maintenance schedule. If you are experiencing frequent material degradation or leaks after washdowns, we can help.
Send a photo of your current equipment setup and your CIP parameters to amin@soshh.com. Our technical engineering team will evaluate your application and provide a tailored, long-lasting solution within 24 hours.
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