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Bolted flange flexible sleeves for powder and bulk material handling. Food-grade polyether TPU, tool-free flange installation, FDA 21 CFR 177.2600 tested. Custom sizes available.
The FLC Round Flange Flexible Connector is a bolted flexible sleeve that connects two flanged pipe faces in powder and bulk material handling. Integrated polyurethane flanges at both ends are compressed between the equipment flange and metal backing plates, isolating vibration and containing powder without hose clamps or adhesives.
Choose FLC when: flanges already exist on your equipment, the connection is not removed frequently, or the line operates under vibration or positive/negative pressure.
Choose a snap-in or clamp connector when: the connection must be opened daily for CIP cleaning or rapid product changeover.
The SOSHH® FLC round flange flexible connector is an ultra-durable, zero-leakage elastomeric expansion sleeve engineered specifically for rigid flanged piping, heavy-duty vibratory screeners, bin activators, and continuous pneumatic conveying lines. Featuring integrated molded polyurethane flanges at both ends, the FLC sleeve clamps securely between standard equipment companion flanges and metal backing pressure plates. Fabricated from 100% FDA-compliant virgin Ether-grade Polyurethane (TPU), it delivers superior abrasion resistance, high pressure/vacuum stability, and permanent ATEX anti-static safety with zero tooling fees for custom diameters and bolt hole patterns.
In high-vibration powder screening, positive-pressure pneumatic conveying, and dense-phase bulk transfer, conventional rubber sleeves or hose-clamped connections can slip off, develop rim tears, or allow fine dust escape. The SOSHH® FLC Round Flange Connector provides a mechanically locked, bolted elastomeric barrier that eliminates clamping failure.
By compressing the integrated PU flange collar directly between the pipe flange and heavy-duty metal backing rings, the FLC series withstands continuous operating pressures up to +0.8 bar and deep vacuum conditions down to -0.5 bar without blowouts or inward sleeve collapse.
Manufactured using high-frequency thermal welding rather than stitching or adhesive bonding, the FLC connector features a 100% smooth, crevice-free internal bore. This eliminates internal ledges where bulk solids accumulate, preventing microbial growth and supporting Clean-In-Place (CIP) washdown procedures.
| Technical Parameter | Standard Food-Grade (PU10) | ATEX Anti-Static (PUAS) | High-Temperature (PUHT) | Fiber-Reinforced (PURF) | Wire-Reinforced (PUFL) |
| Primary Material | 100% Virgin Ether TPU | Anti-Static Ether TPU | Thermal-Stabilized TPU | Multi-Ply Fiber TPU | TPU w/ SS304 Spiral Wire |
| Material Color | Crystal Clear | Crystal Clear | Light Amber | Clean Optical White | Translucent White |
| Wall Thickness | 1.0 mm (0.04") | 1.0 mm (0.04") | 1.0 mm (0.04") | 0.8 mm (0.03") | 0.6 mm to 1.5 mm |
| Operating Temp | -20°C to +110°C | -20°C to +110°C | -20°C to +150°C | -20°C to +110°C | -20°C to +110°C |
| Surface Resistivity | > 10^12 Ohm | < 10^9 Ohm (ATEX) | > 10^12 Ohm | > 10^12 Ohm | > 10^12 Ohm |
| Tensile Strength | 40 MPa | 15 MPa | 40 MPa | 300 MPa (Heavy Duty) | 40 MPa |
| Elongation at Break | 600% | 600% | 600% | 600% | 600% |
| DIN Abrasion Loss | 39.0 mg | 39.0 mg | 35.0 mg | 39.0 mg | 35.0 mg |
| Air Permeability | 100% Airtight | 100% Airtight | 100% Airtight | 100% Airtight | 100% Airtight |
| Food Compliance | FDA / EU Certified | FDA / EU Certified | FDA / EU Certified | FDA / EU Certified | FDA / EU Certified |
| Ideal Application | General powder drop | Combustible fine dust | Hot air drying chutes | High-pressure blowers | High-amplitude gyratory |
| Engineering Feature | SOSHH® FLC Bolted Round Flange Sleeve | Conventional Hose-Clamp Flexible Sleeves | Standard Rubber Expansion Joints |
| Connection Security | Bolted metal pressure plate (Cannot slip off) | Worm-drive clamps vibrate loose over time | Heavy bolted assembly |
| Pressure Stability | High positive/negative pressure resistant | Prone to slipping under minor backpressure | High pressure capability |
| Abrasion Resistance | 3 to 5x longer service life than rubber | Low (Tears easily at clamp pressure zones) | Standard |
| Optical Clarity | 100% Transparent (Visual flow monitoring) | Opaque or cloudy | Opaque black |
| Sanitary Compliance | FDA 21 CFR 177.2600 & EU 10/2011 | Varies; stitching harbors bacteria | May leach oils or black carbon |
Absorbs continuous high-frequency multi-axis mechanical oscillation between screener discharge spouts and downstream fixed chutes without developing stress cracks at the flange junction.
Maintains airtight containment on blower discharge lines, cyclone separators, and rotary airlock feeder connections where pressure surges dislodge standard clamp-on sleeves.
Provides a durable, dust-tight interface for mobile filling heads and bulk packaging stations handling abrasive grains, mineral powders, and pharmaceutical granules.
Compatible with standard round interfaces with built-in flanges at both ends
It is tightly connected by two flange pressure plates pressed in the middle
Suitable for high sealing reliability requirementsand equipment points that don't need to be disassembled frequently
Fit the flange pressure plate on the flexible hose, then tighten the bolts at both ends in sequence to complete the installation.
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As a specialized engineering manufacturer of flexible connection systems, SOSHH® manufactures FLC round flange sleeves to your exact equipment geometry:
The FLC Round Flange Flexible Connector is a bolted flexible sleeve that connects two flanged pipe faces in powder and bulk material handling. Integrated polyurethane flanges at both ends are compressed between the equipment flange and metal backing plates, isolating vibration and containing powder without hose clamps or adhesives.
Ether-based TPU (thermoplastic polyurethane). The material passed FDA 21 CFR 177.2600 total extractives testing (Test Report Ref: TQT4821B36E).
Continuous use from -30°C to +85°C, with a short-term peak of +110°C. The connector supports 85°C CIP (clean-in-place) cleaning.
No. The TPU material passed FDA 21 CFR 177.2600 total extractives testing. This is a material compliance test result, not a product certification, and it applies to the tested sample and test conditions in the referenced report.
ANSI 150#, DIN PN10/PN16, and JIS flange patterns are supported. Custom bolt circles, hole counts, and flange outer diameters are fabricated to match your existing equipment.
Yes. The connector is fabricated to match your existing flange outer diameter, bolt hole count, and pitch circle diameter, so replacement does not require changing the existing flanged piping.
Choose FLC when flanges already exist on your equipment, the connection is not opened frequently, or the line operates under vibration. Choose snap-in or clamp connectors when the connection must be opened daily for CIP cleaning or rapid product changeover.
The integrated PU flanges are compressed between the equipment flange and metal backing plates using standard bolts. No adhesive, hose clamps, or special tooling is required.
Flange diameters and bolt circles are fabricated to order. Contact our engineering team with your flange outer diameter, bolt hole count, and pitch circle diameter for a size confirmation.
Yes. 2D outline drawings and datasheets are available for evaluation. 3D CAD files are provided after a signed NNN agreement.
To get a matching FLC connector, provide these four measurements:
Send these four values through the request form, and our engineering team will confirm the matching sleeve dimensions.
(Trademark Disclaimer: SOSHH® is an independent registered brand of Zhejiang Jingzhen Environmental Protection Technology Co., Ltd. References to standard flange patterns or legacy equipment models are strictly for technical cross-reference and dimensional compatibility.)
