Used Langheinz Ice Water System For 30 Liter Per Batch for sale (73,284)

Condition: used, Emulsion splitting plant, oil-water separation system -The cost-effective and permanently reliable solution to the problem is usually the oil/water separation for dispersed condensates. The purified water meets the legal requirements for sewer discharge. -Dimensions: 590/590/H1170 mm -Weight: 58 kg Hfsdpfx Aiectlaqecok

Condition: good (used), Year of construction: 2007, Single-stage reverse osmosis system. Model: R0 04-1 with EWMK40 2xRVMR1ACM Width: 880 mm Height: 1450 mm Depth: 380 mm Hjdpfxjzqtp Ro Aicjfk Control cabinet dimensions: Width: 500 mm Depth: 250 mm Height: 500 mm Total weight: 120 kg Condition: good, second-hand

Condition: excellent (used), Here we offer a Millipore water purification system, Elix 3. Purifies 3 liters of water per hour. Condition: used. Hfsdjzgcbzopfx Aicok Scope of delivery: (See image) (Changes and errors in the technical data and specifications are subject to change!) We would be happy to answer any further questions you may have over the phone.

Condition: excellent (used), CTS TSS-70/130 Temperature Shock Testing Chamber Manufacturer: CTS Clima Temperatur Systeme GmbH Type: TSS-70/130 Machine Type: Temperature Shock Testing Chamber / Temperature Testing Chamber Test Volume: approx. 130 liters For sale is a used temperature shock testing chamber from the manufacturer CTS. The system is suitable for temperature shock tests, temperature cycling tests, material testing, electronics testing, quality assurance, and research and development. Technical Data Hot Chamber: +50 °C to +200 °C Cold Chamber: -80 °C to +100 °C Temperature change rate: max. 100 K/min on average Cycle time: < 10 seconds Temperature adjustment rate: ≤ 15 min in the range of -65 °C to +200 °C Heating rate: approx. 6 K/min Cooling rate: approx. 4 K/min Temperature deviation over time: ±1 K Temperature deviation spatially: ±2 K External dimensions approx.: 2335 x 940 x 1820 mm (W x D x H) Loading dimensions approx.: 1990 x 940 x 1652 mm (W x D x H) Test chamber dimensions approx.: 480 x 660 x 410 mm (W x D x H) Window: approx. 300 x 300 mm Weight approx.: 950 kg Power connection: 400 V 3/N / 50 Hz Power consumption: approx. 16.6 kW Rated current: approx. 28.0 A Fuse rating: 32 A slow-blow Protection class: IP22 Refrigerant Pre-cooling Stage: R404A, 4.0 kg Refrigerant Cooling Stage: R23, 0.6 kg / 10 bar Operating overpressure PS: 25 bar Operating Requirements Hodpfx Aijzf Ibkocsfk Water-cooled design Cooling water connection required Compressed air connection required Operation possible only with cooling water and compressed air Cooling water inlet: 3 - 6 bar Equipment CTS Control Panel Microprocessor-controlled control and monitoring system Program operation Digital setpoint and actual value display RS232 interface RS485 interfaces Potential-free contact Digital inputs and outputs Hot and cold chamber Trolley with lead screw drive Test chamber / trolley made of stainless steel Insert basket made of stainless steel wire Pipe penetration NW 50 with sealing plug Compressed air connection 1/4" male thread Condensate drain R 1/2" female thread Safety door locking Lockable door with viewing window Scope of Supply 1x CTS TSS-70/130 Temperature Shock Testing Chamber Insert basket / test chamber equipment Existing documentation / files Operating manual Accessories as shown in the pictures Condition Used Optical condition as shown in the pictures The device can be switched on Scope of supply as shown in the pictures. Subject to changes and errors in the technical data, as well as prior sale.

Year of construction: 2022, condition: like new (used), Millipore Milli-Q ultrapure water system IQ 7000. Without cartridges. With MilliQ Q-Pod. Unused. Includes functional warranty. Hjdpfxewutuqo Aicefk

Condition: refurbished (used), Year of construction: 2003, operating hours: 7,951 h, functionality: fully functional, total width: 2,450 mm, total length: 7,600 mm, pressure: 1,000 bar, operating pressure: 1,000 bar, fuel: diesel, overall weight: 9,000 kg, rotational speed (max.): 2,100 rpm, empty load weight: 9,000 kg, year of last overhaul: 2025, water pressure: 1,000 bar, pump capacity: 205 l/min, Equipment: rotational speed infinitely variable, type plate available, High-pressure pump unit, Hammelmann HDP 402, housed in a WAB container. Similar to, but not a Kamat, Uraca, or Woma. Pump type: Hammelmann HDP 402 PRESSURE STAGE 1: Operating pressure: 880 bar Flow rate: 242 l/min PRESSURE STAGE 2: Operating pressure: 1000 bar Flow rate: 205 l/min Drive speed: 2100 rpm Plunger: d50 mm Drive power: 400 kW with a 442 kW Caterpillar C-15 2CPXL14.6ESK diesel engine with workshop and changing room. Dimensions L x W x H: approx. 7600 x 2450 mm Hsdpeipadxjfx Aicsfk Weight: approx. 9000 kg Year of manufacture: 2003 Operating hours: 7951 Condition: The high-pressure pump has been fitted with new valves. New batteries. In good used condition.

Condition: used, - Dimensions : 360 x 525 x 660 mm - Système mono-saveur - Panneaux latéraux en acier inoxydable - Système de distribution par pompe - Panneau de commande avec indicateurs LED - Commandes numériques précises - 3 niveaux de consistance (onctuosité ajustable) - Capacité du réservoir : 7 litres (+ 2,3 litres dans le bac de congélation) - Refroidissement par air - Production théorique : jusqu'à 170 cornets par heure - Bac d'hygiène (non visible sur la photo = fourni lors de l'entretien) - Marque : SPM DRINK SYSTEM - Modèle : U-GO P - Distributeur français : GUSTO CONCEPT - Réfrigérant : R404A - Tension : 240 V - Puissance : 1 kW - Poids : 75 kg Hodpfx Aieyhmlbjcofk

Condition: good (used), Batch dryer dryer Aeromatic Strea 30 fluidized bed dryer batch dryer Stainless steel version Complete with control cabinet and accessories (operation unknown) Total height +/- 3 meter Equipped with nozzle device Hjdjwyf H Nopfx Aicjfk Suitable for drying and coating Fan power 5,5kW 62000 kcal/h See our other advertisement VMA Wekerom

Condition: used, Osmosis / water treatment system with Heyl testomat 2000 further details and scope of delivery see photo. Technical data see type plate. Item condition: used, untested condition: used, untested sample photos sample pictures Hfsdpfx Astzxuysicok A viewing in Rietberg is possible! If you have any further questions, please contact us by email. The sale takes place exclusively to commercial interested parties for commercial purposes and under exclusion of any warranty for material and legal defects! With your purchase you confirm that you are working commercially or as a freelancer. Otherwise you violate our terms and conditions!

Condition: new, Year of construction: 2026, TITAN DOUBLE Trade Industrial Company AB is a Polish manufacturer of modern professional equipment trusted by professionals in over 55 countries worldwide. Industrial printer TITAN DOUBLE is designed for inkjet large format contactless full-color CMYK printing. OUR ADVANTAGES = YOUR BENEFITS: TITAN DOUBLE The new printing machine from TICAB PRINT has two print heads. Now, you can print in a single pass on large items. Your benefits: • Enhanced workflows. Hjdsvt Uvzspfx Aicefk • Wider range or samples to print on. • More comfort during printing. We are official partners of the Hewlett Packard Company. You can get the TITAN DOUBLE printing machines at the manufacturer’s price. Online education and full technical support is provided. KEY FEATURES of TITAN DOUBLE: 1) Average printing speed is 50 units per minute. 2) The opportunity to print from 1 copy without increased cost per piece. 3) No preparations or cliches are needed. 4) Low cost per copy is from 0.01 euro/unit (you will see an accurate amount on the monitor during printing). 5) Printing on different materials: paper, carton (assembled and disassembled boxes), textile, wood, and plywood. 6) Branded software from TICAB PRINT (included in the printer's price). 7) Printer's components and accessories of our own design and production. TITAN DOUBLE is an innovative printing system. It allows you to feed huge items beneath the printer head. Printer heads can be adjusted up to 10 cm above the conveyor belt. High quality Hewlett Packard HP pigment ink provides resistance to the fading, scratches. and water after the image dries. Technical Characteristics of the Printer head: Print area width - up to 59.4cm (23.4 in) Print area length - from 2.54 cm (1 inch) to 91.44 cm (36 inch) Workpiece movement speed - up to 45.72 cm (18 in) per second Printing speed - up to 50 arc\ min A4, up to 16 arc\ min A3 Print resolution - 1200x1200dpi Colors - CMYK (Cyan, Magenta, Yellow, Black) Ink type - water-based pigment ink Information connection - Ethernet 10/100/1000 Base-T network port Operating system - Windows (recommended Windows10) Hewlett Packard HP driver TICAB software: The current status of the printer is being monitored. Number of prints is calculated - the total and the current task. The calculation of the value of ink consumption. Monitoring the current level of ink in the cartridges. Starting the printer nozzle maintenance and cleaning functions. Starting the procedures for replacing the cleaning mechanism. Calibrate the printer nozzles for linearity and color uniformity. Start the procedure for high-speed printing of a large number of copies.

Condition: new, Year of construction: 2026, functionality: fully functional, Ticab Printing System TPS is an innovative cantilever equipment. It allows feeding huge items beneath the print head. The print head can be adjusted up to 30 cm above the conveyor belt to feed folded cardboard boxes or other huge items. High quality Hewlett Packard HP pigment ink provides resistance to the fading, scratches and water after the image dries. Call us to get a beneficial commercial offer. Hjdpou Ibhwefx Aicjfk Specifications:  Print area width: up to 29.7cm (11.7 in)  Print area length: from 2.54 cm (1 inch) to 91.44 cm (36 inch)  Workpiece movement speed: up to 45.72 cm (18 in) per second  Printing speed: up to 50--70 copies\min A4, up to 16 copies\min A3  Print resolution: 1200x1200dpi  Number of inkjet nozzles: 59136 (14 printing zones of 4224 nozzles each)  Colors: CMYK (Cyan, Magenta, Yellow, Black)  Ink type: water-based pigment ink  Information connection: Ethernet 10/100/1000 Base-T network port  Operating system: Windows (recommended Windows10)  Hewlett Packard HP driver  Trusted by professionals in 55 countries worldwide!

Condition: used, This listing is for the Millipore Elix Essential 10 UV Water Purification System The unit is in full working condition and is ready for immediate use Here’s a clear overview of the Milli‑Q Elix Essential 10 UV Water Purification System, a laboratory-grade water purification unit used to produce high-quality pure water Preparing reagents, buffers, and solutions Feeding instruments like autoclaves, washers, and ultrapure water systems Hedpfxey Iwzzj Aicefk General chemical or biological lab work requiring reliable Type 2 water quality

Condition: good (used), Oil-water separation system for compressor condensate External dimensions: Diameter: 600 mm Hfsdpfszh Iddox Aicsk Height: 1180 mm Weight: approx. 50 kg Condition: good, second-hand

Condition: used, This listing is for the Agilent PCB1500 Water Peltier System. The unit is in full working condition and ready for immediate use. Designed for precise thermal regulation, it provides stable and efficient temperature control for sensitive lab processes. Ideal for integration with analytical instruments requiring consistent cooling performance Transparency Report and Technical Audit: • Source Pedigree: Biotech / Research Facility Hjdpoyz Aquofx Aicsfk • Condition: Direct-from-Bench (Decontaminated/Original) • Power-On Test: Verified; Digital display active, lighting operational, and fan system engaged. • Integrity: 100% Original Parts (Non-Refurbished)

Year of construction: 2026, condition: new, functionality: fully functional, New machine with a 24-month warranty Stainless steel model Advantages: + Mobile unit with locking castors + Completely made of stainless steel + For the production and preparation of pastry dough, baking cream, chocolate, fondant, fruit jam, coatings, fillings, as well as for any product requiring uniform heating and mixing + Thermal oil circulates in the double-walled tank, designed for safe and easy use + Triple-walled construction for optimal thermal insulation + With side and bottom scrapers + Electronic thermostat for setting the cooking temperature + Manual / automatic operation possible Hodpjivdnvofx Aicefk + Digital temperature display with timer + The tank can be easily tilted for emptying via a handwheel (optional: with a drain tap) + Two working speeds + Safety switch in case of overheating SPECIAL optional accessories, available at an extra cost: - Drain tap for quick and easy emptying: + €880.00 net - Machine with frequency inverter for stepless stirring speed: + €1,115.00 net - Double mixing tool for particularly homogeneous mixing: + €725.00 net - Higher temperature (instead of 150 °C, up to 180 °C possible) + €900.00 net Technical data: - Capacity: 30 liters - Max. temperature: 150 °C (optional up to 180 °C) - Thermal oil volume: 12 liters - Heating power: 4 kW - Motor power: 0.37 kW / 0.45 kW (1st / 2nd speed) - Connection values: 400 V - 3Ph - 50Hz - 16A CEE plug - Dimensions: 960 x 725 x 1530 mm (W x D x H) - Filling height: 1100 mm - Net weight: 121 kg

Condition: new, Year of construction: 2026, functionality: fully functional, warranty duration: 24 months, input voltage: 400 V, total width: 690 mm, total length: 940 mm, total height: 1,470 mm, empty load weight: 300 kg, power: 3 kW (4.08 HP), height adjustment type: mechanical, New machine with a 24-month warranty. Advantages: + Excellent price-performance ratio + Powerful planetary mixing machine with digital control + 10 speeds with constant power transmission + Equipped with an ingredient hopper and a safety guard made of stainless steel + The machine switches off immediately when the guard is lifted + With integrated dust/splash protection cover + The machine stands on 4 vibration-absorbing adjustable feet + No floor anchoring required + Bowl lift with lever + Bowl support arms made of stainless steel + Closed planetary gearbox made of stainless steel + Can also be used with a 30-liter attachment (optional) + Fast spare parts supply within 1-2 working days STANDARD accessories, included in the price: - 1x 60-liter stainless steel bowl - 1x mixing beater for 60-liter bowl - 1x flat beater for 60-liter bowl - 1x dough hook for 60-liter bowl OPTIONAL accessories, available at an extra cost, prices on request: - Additional 60-liter stainless steel bowls - Additional tools (mixing beater, flat beater, dough hook) - Bowl trolley for 60-liter bowls - 30-liter attachment (1x 30-liter stainless steel bowl + 3 tools for 30-liter bowl) Technical data: - Motor power: 3.0 kW - RPM at 50 Hz: 165 - 450 (level 1 - 10) Hodpfxshydl Ie Aicsfk - Connection values: 400V - 3-phase - 50Hz - 16A-CEE plug - Dimensions: 690 x 940 x 1470 mm (W x D x H) - Max. 1710 mm height when the hood is open - Net weight: 300 kg

Condition: used, This listing is for a Waters Acquity H-Class UPLC. The unit is in full working condition and is ready for immediate release. Unit includes: TUV Detector Column Manager Sample Manager Binary Solvent manager Software and computer can be provided at extra cost. Unlock the full potential of your laboratory with the Waters Acquity H-Class UPLC System, a cutting-edge high-performance liquid chromatography (HPLC) solution designed for unparalleled flexibility and efficiency. This advanced system is engineered to deliver exceptional chromatographic separations, making it the ideal choice for pharmaceutical, biotechnology, food and beverage, and environmental applications. Key Features: Quaternary Solvent Blending: Seamlessly combine up to four solvents to optimize method development and enhance analytical workflows. Hfjdsxv Duuspfx Aicsk Flow-Through-Needle Injector: Effortlessly transfer existing HPLC methods to UPLC, significantly reducing method development time and boosting throughput. Empower and MassLynx Software: Benefit from advanced data processing capabilities, including peak picking and integration, ensuring precise analysis and reporting. UNIFI Scientific Information System: Streamline data management for metabolomics, proteomics, and glycomics, facilitating comprehensive analysis. Benefits: Experience improved laboratory productivity as you transition to UPLC/UHPLC technology, reducing analysis time while increasing efficiency. Achieve enhanced resolution and sensitivity, allowing for more accurate analysis of complex samples. Simplify method development with advanced tools and software, accelerating the discovery of new methodologies. Applications: Whether you are conducting pharmaceutical research, analysing food safety, or monitoring environmental pollutants, the Waters Acquity H-Class UPLC System delivers high sensitivity and resolution for all your analytical needs. Elevate your chromatography capabilities today and transform your laboratory's performance with this innovative system.

Condition: used, This listing is for a Millipore AFS 15E Water Purification System with 60l Tank. The unit is in full working condition and is ready for immediate release. The Millipore AFS 15E is designed to deliver high-quality Clinical Laboratory Reagent Water (CLRW) efficiently and economically, making it essential for laboratories that adhere to rigorous standards. Hfedjxxy Szjpfx Aicjk Key Features: CLRW Compliance: Produces water that meets the Clinical and Laboratory Standards Institute (CLSI) guidelines, ensuring reliability in clinical settings. Elix® EDI Technology: Utilizes advanced electrodeionization (EDI) for low and predictable operating costs, coupled with self-regenerating ion exchange resins that reduce maintenance. Data Monitoring: Equipped with full monitoring capabilities, the system archives water quality data for up to six months, allowing for easy tracking and compliance verification. Feed Water Quality: Accepts potable water with a pressure range of 1–6 bar and a temperature range of 5–35°C, ensuring versatility in various setups. Storage Capacity: Comes with a 60L tank, providing ample storage for the purified water, which is crucial for laboratories with high water demands. Specifications: Production Capacity: Generates up to 300 litres of water daily, catering to high-throughput needs. Production Flow Rate: Delivers water to the reservoir at 15 L/h. Distribution Flow Rate: Dispenses water to analysers at up to 2 L/min, ensuring quick access when needed. Product Water Quality: Resistivity at 25°C: > 15 MΩ·cm, indicating high purity. Total Organic Carbon (TOC): < 30 ppb, suitable for sensitive analytical applications. Dimensions: Compact size of 585 x 268 x 426 mm (23 x 10.6 x 16.8 in) enables easy integration into laboratory spaces.

Condition: used, This listing is for a Elga Purelab Option Water Purification System with 40l Tank. The unit is in full working condition and is ready for immediate release. Optimize your laboratory's water quality with the Elga Purelab Option Water Purification System, designed to deliver high-quality Type 2 water for various laboratory applications. Key Features: Type 2 Water Purification System: Perfect for general laboratory use and feeding Type 1 water purification systems, ensuring you have reliable water quality for various experiments. 40L Storage Tank: Equipped with a spacious 40L tank, providing ample storage for your purified water needs, minimizing the need for frequent refills. Advanced UV Treatment: Features a dual-wavelength UV lamp (185/254 nm) that facilitates photo-oxidation of feed water, significantly reducing Total Organic Carbon (TOC) levels to less than 30 parts per billion (ppb)—ideal for sensitive applications. High-Quality Deionization: Utilizes a deionization cartridge to achieve resistivity levels ranging from 1 to 10 , ensuring high purity water suitable for critical lab tasks. Built-in Boost Pump: The integrated boost pump facilitates the recirculation of treated water, enhancing the system's efficiency and maintaining water quality over time. Hfjdpfxexxy U No Aicok Compact and User-Friendly Design: Designed for ease of use, the system’s compact footprint makes it suitable for various lab setups without compromising space. Specifications: Water Flow Rate: Capable of delivering up to 7.5 liters per hour (LPH), ensuring a steady supply of purified water for your laboratory requirements. Resistivity Levels: Achieves resistivity ranging from 1 to 10 megohm-cm, providing high-quality water suitable for sensitive analytical applications. TOC Reduction Performance: Effectively reduces TOC levels to less than 30 ppb, critical for applications requiring ultra-pure water. UV Lamp Specifications: The dual-wavelength UV lamp (185/254 nm) not only assists in TOC reduction but also helps in the disinfection of water, enhancing its overall quality.

Condition: used, This listing is for the Veolia/Elga PC1ANRXM2 Purelab Chorus The unit is in full working condition and is ready for immediate release The Veolia ELGA PURELAB Chorus 1 Complete is a high-performance water purification system engineered for laboratories demanding the highest water purity. It is ideal for supporting analytical research, quality control (QC) testing, and pharmaceutical manufacturing processes, delivering reliable Type I ultrapure water. Key Specifications Water Quality: 18.2 MΩ·cm resistivity (Type I) Flow Rate: Up to 20 litres per hour Features: Advanced PureSure® deionization for consistent water quality Fully recirculating system to maintain microbial purity Real-time TOC monitoring to ensure organic purity Integrated filtration for endotoxins, proteins, particulates USB data capture for performance validation Optional ELGA Biofilter for biologically active impurities Hfsdpfsxv A Uaex Aicek Cost-effective design supporting QC testing to validate drug purity in pharmaceutical manufacturing Consumables engineered to minimise cost and environmental waste Ideal Applications Analytical Research Life Sciences Pharmaceutical QC Testing Glassware Washing and Ultrapure Feed Systems

Condition: used, This listing is for the Millipore Elix Advantage 15 Water Purification System The unit is in full working condition and is ready for immediate use The Elix Advantage 15 is a laboratory water purification system designed to generate Type II pure water directly from potable tap water using an advanced combination of purification technologies. It’s part of Millipore’s Elix series, which emphasizes reliable, continuous production with minimized maintenance needs. Hsdpfx Aox Tuctoicsfk

Condition: used, This listing is for the Spectrum Labs KrosFlow KR2i TFF System The unit is in full working condition and is ready for immediate release The KR2i TFF System is a versatile tangential flow filtration system, suitable for running volumes from 2 mL up to 10 L. It consists of a pump, tablet controller, scale, module stand, and real-time data collection software. The KR2i can mount up to two pump heads, allowing users to add an additional one if desired. Key Features of KR2i TFF System: Hollow fiber filter for 2 mL to 10 L / Flat sheet cassettes can process 12 mL to 15 L Auxiliary pump (900-1893): 600 RPM SAW-KR21 Scale: Capacity up to 20 kg with readability of 0.2 g Hfodpfx Ajxwc Eujicjk Scale platform size: 18 x 18 cm Tablet control for ease of operation and real-time monitoring IP33-rated plastic enclosure is easy to clean Assortment of accessories included (see photos) The KR2i pump is designed to handle abrasive slurries, corrosive fluids, and highly viscous fluids with minimal wear. The system ensures that the fluid only comes into contact with the tubing and tube material, eliminating valves that could clog and making the inner surfaces easy to clean. With its compact footprint and versatility, the KR2i is an ideal choice for small-volume, R&D-scale microfiltration and ultrafiltration

Condition: used, Oil-water separator KAESER BEKO, type Öwamat Tank diameter: 600 mm Overall height: 1200 mm With activated carbon filter Space requirement: Ø 700 x 1200 mm Weight: approx. 30 kg Hfedpfx Ajy Ty Saoicok In good condition.

Condition: used, Compressed air dryer PARKER HIROSS for compressor systems Mechanical condensate separator, water separator Refrigerant dryer with water-cooled aftercooler for removing water vapor and cooling the compressed air or gases. 1 aftercooler, type WFN009 DHH16 Air flow rate (normal): 540 m3/h = 9000 liters/min. Operating pressure (air): max. 16 bar Housing length: 1020 mm Housing diameter: Ø 105 mm Threaded air connection: G 2" Threaded water connection: G 3/4" Weight of aftercooler: 11 kg Dimensions of aftercooler (L x W x H): 1030 x 850 x 200 mm + 1 water separator, type CSP 008 Flow rate (normal): 480 m3/h = 8000 liters/min. Operating pressure: max. 16 bar Threaded connection: G 2" - Filter housing made of aluminum + 1 mechanical condensate separator HIROSS SAC 120 Threaded connections: R 1/2" Operating pressure: 16 bar Volume: 0.8 liters - Operates without compressed air loss Hfjdpfx Aiedzqn Uscjk All components mounted as shown in the pictures. Height when mounted vertically: 2000 mm Total weight: approx. 40 kg

Condition: used, This listing is for 1 of 3 Millipore Rios-DI UV Water Puerification System RiOs-DI® 3 UV Water Systems with built-in 254 nm bactericidal UV lamp easily and economically produce up to 15 L/day of consistent-quality Type 2 pure water from tap water. A combination of reverse osmosis (RO) technology and deionization (DI) resins delivers water with high resistivity ( > 10 MΩ·cm) and low TOC (< 30 ppb) whose quality surpasses that of service DI or distilled water UV lamp helps ensure optimal water quality for bacteria-sensitive applications Pure water flow rate of >2.4 L/hr Integrated 6-L storage reservoir Avoid the drawbacks of other purification methods such high lab space demands for resin bottles or distillation equipment; heavy maintenance; lack of quality monitoring; and in the case of distillation, high energy and water use Hodexzhcmopfx Aicsfk