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Stax CF cake filtration capsules are ideally suited to accommodate high-solid-load contents, often occurring in various process steps in the blood plasma fractionation process, the API industry, and in some biotech harvest applications. The addition of filter aids and/or lose activated carbon powder often facilitates filtration of difficult-to-handle products. However, the removal of filter aids/carbon powder can be somewhat challenging. In the past, the way forward was to use filter presses equipped with individual filter sheets. Discharge of filter sheets (often completely loaded) can be a difficult process, as disposal is a dirty, labor-intensive process not suited for a GMP environment. In cases where filter cakes are contaminated, operators must be protected by wearing protective clothing in order to avoid any risk of exposure.
Using Pall’s well-established Stax technology, removal of filter aids can be handled in a convenient way, as the entire system is encapsulated. After the filtration step, the removed filter aid/carbon powder is stored within the capsules and can be easily disposed of. The Stax system enables a safe, clean way to deal with challenging process steps and streamline your process filtration applications. Stax disposable depth filter capsules increase process efficiencies and address the need for simplicity, safety, speed, and intuitive operation.
Simple, Intuitive Operation
Placed into one of three different sized chassis, Pall’s single-use Staxpolypropylene capsule filters eliminate the use of stainless steel housings or filter presses which require costly cleaning and cleaning validation. Stax system chassis are designed for assembly and use by a single operator and provide a logically conceived disposable platform in which the operator can load, operate, and unload in an ergonomically designed vertical orientation.
With simple, straightforward forward and familiar features, the Stax platform eliminates the risk of error or mishap, and enables greater process success. Single-use systems further maximize the overall benefits of implementing a single-use strategy and the Stax platform.
Complete Flexibility in Process Design
The Stax platform has been designed to accommodate nearly all processing options. Whether you want to process:
- Bottom in/bottom out
- In series
Simply using Pall’s uniquely designed manifold kits provides complete flexibility in your process design.
The Pall Stax capsules are available in a wide array of advanced pharmaceutical-grade Seitz depth filter media. Supported through comprehensive validation guides, Seitz depth filter media meets the highest pharmaceutical standards for:
- Quality
- Lot-to-lot consistency
- Manufacturing control
- Low extractable content
- Low endotoxin content
Features and Benefits of Stax Systems
| Features | Benefits |
| Low hold-up volume | Greater product recovery and lower post use rinse volume requirements than traditional systems. Post use blow down in forward flow direction is possible |
| No housings | Easier to use and manipulate while eliminating operator safety issues |
| Completely disposable | Eliminates need for cleaning and cleaning validation |
| Encapsulated design | Reduces operator exposure to potential hazards |
| Intuitive operation | Reduces operator training and increases time to acceptance |
| Small footprint | Enables use in close proximity to other equipment and reduces cost to install |
Specifications
| Media | Cellulose Base |
| Capsule shell | Glass filled polypropylene |
| Filter element | Polypropylene |
| Gaskets | Silicone |
For further information regarding extractables data and certifications for the capsule shells and manifolds please reference the Stax platform validation guide USTR 2528. For extractable data and certification for the P-Series media, please reference USTR 2366.
Table 4: Operating Parameters(1)
| Maximum operating temperature | 60 °C |
| Maximum operating pressure | 3.5 bar at 25 °C 1.0 bar at 60 °C |
| Maximum differential pressure | 1.5 bar at 25 °C – forward direction |
(1) Note: All pressure and temperature specifications are for Stax capsules correctly installed into Pall Stax chassis.
Table 5: Sanitization
| Post use caustic treatment | 1 M NaOH at 3.5 bar for 1 h at 25 °C |
Table 6: Traceability
| Capsule part number laser engraved with | Media batch number Internal sales order number Unique serial number |
Pre Release Testing
All capsules 100% leak tested
Table 7: Chassis Dimensions| Chassis Model | Height | Length | Width |
| SXLSC02 | 1018 mm (40.0 in.) | 516 mm (20.3 in.) | 516 mm (20.3 in.) |
| SXLSC02W | 1059 mm (41.7 in.) | 591 mm (23.2 in.) | 560 mm (22.0 in.) |
| SXPSC05P | 1241 mm (48.9 in.) | 610 mm (24.0 in.) | 610 mm (24.0 in.) |
| SXPSC05W | 1312 mm (51.6 in.) | 1150 mm (45.3 in.) | 800 mm (31.5 in.) |
| SXPSC10P | 1864 mm (73.4 in.) | 610 mm (24.0 in.) | 610 mm (24.0 in.) |
| SXPSC10W | 1935 mm (76.2 in.) | 1150 mm (45.3 in.) | 800 mm (31.5 in.) |
Chassis Materials of Construction
304/1.4301 Stainless Steel 1.2 μm / 64 μin Ra (typical) Electro-polish
Design Basis
- Conforms to Pressure Equipment Directive – Category 1 / Module A (SXLSC02 is Sound Engineering Practice)
- Outside scope of ASME VIII Div 1 Complies with Universal Building Code (1997) – Zone 4 / Importance factor 1.25 (SXPSC*P ONLY)
* Placeholder for either 05 (indicating a 5 high process scale chassis) or 10 (indicating a 10 high process scale chassis) ATEX chassis available upon request
Applications
Stax capsules with increased spacing are supplied in three different configurations to accommodate variable amounts of solid loads. The following table provides an indication of the available volumes. The volumes are given in liters. In order to calculate the cake quantity in kg, the wet density of the cake must be multiplied with the available volume.
Table 1: Available Volumes (Nominal)
| Configuration for Stax Capsule | Filter area (m²) | Available Volume (L) |
| 402 | 0.5 | 13.2 |
| 404 | 1.0 | 9.9 |
| 406 | 1.5 | 6.8 |
Stax capsules enable a very equal cake distribution over the entire system. Figure 1 shows the full capacity of a Stax capsule with two filter cells using Celite S as DE filling material and a bottom-in, bottom-out configuration. 41.433 g of dry Celite S was suspended in water resulting in a volume of 132.377 liters.
Figure 1: Cake Distribution with a two-cell capsule
Figure 2: Cake distribution with a six-cell capsule
Table 2: Nominal Dimensions and Weight
| Capsule Size | Diameter | Height | Weight (Dry) |
| Large | 442 mm (17.4 in) | 128.8 mm (5.1 in) | 4.5 – 6.5 kg |
Seitz P-series Depth Filter Media
Seitz P-series depth filter sheets were specifically developed for the strict requirements in biotechnological and pharmaceutical industries. Manufactured with stringent in-process control methods assures consistent filtration quality, a very high purity of filter medium, and alignment with the requirements of the pharmaceutical industry. For further information, please reference validation guide USTR 2366.
Typical Permeability (L/m²/min at 1 bar)
Type
Use
Related Documents
Regulatory/Quality Documentation
Ordering Information
Stax Capsules*
| Description | Part Number |
| Media grade EKS-P, two filter cells | SXLPEKS402SP |
| Media grade EKS-P, four filter cells | SXLPEKS404SP |
| Media grade EKS-P, six filter cells | SXLPEKS406SP |
| Media grade EKM-P, two filter cells | SXLPEKM402SP |
| Media grade EKM-P, four filter cells | SXLPEKM404SP |
| Media grade EKM-P, six filter cells | SXLPEKM406SP |
| Media grade SUPRA EK1P, two filter cells | SXLPEK1402SP |
| Media grade SUPRA EK1P, four filter cells | SXLPEK1404SP |
| Media grade SUPRA EK1P, six filter cells | SXLPEK1406SP |
| Media grade KS 50P, two filter cells | SXLP050402SP |
| Media grade KS 50P, four filter cells | SXLP050404SP |
| Media grade KS 50P, six filter cells | SXLP050406SP |
| Media grade SUPRA 80P, two filter cells | SXLP080402SP |
| Media grade SUPRA 80P, four filter cells | SXLP080404SP |
| Media grade SUPRA 80P, six filter cells | SXLP080406SP |
| Media grade K 100P, two filter cells | SXLP100402SP |
| Media grade K 100P, four filter cells | SXLP100404SP |
| Media grade K 100P, six filter cells | SXLP100406SP |
| Media grade K 200P, two filter cells | SXLP200402SP |
| Media grade K 200P, four filter cells | SXLP200404SP |
| Media grade K 200P, six filter cells | SXLP200406SP |
| Media grade K 250P, two filter cells | SXLP250402SP |
| Media grade K 250P, four filter cells | SXLP250404SP |
| Media grade K 250P, six filter cells | SXLP250406SP |
| Media grade K 700P, two filter cells | SXLP700402SP |
| Media grade K 700P, four filter cells | SXLP700404SP |
| Media grade K 700P, six filter cells | SXLP700406SP |
| Media grade K 900P, two filter cells | SXLP900402SP |
| Media grade K 900P, four filter cells | SXLP900404SP |
| Media grade K 900P, six filter cells | SXLP900406SP |
| Media grade SUPRAdur 50P, two filter cells | SXLD50P402SP |
| Media grade SUPRAdur 50P, four filter cells | SXLD50P404SP |
| Media grade SUPRAdur 50P, six filter cells | SXLD50P406SP |
Stax Manifold Kits
| Description | Part Number |
| Bottom in, top out; 1½ inch manifold | SXTBM400SP1½in |
| Bottom in, top out; 2 inch manifold | SXTBM400SP2in |
| Bottom in, bottom out; 1½ inch manifold | SXBBM400SP1½in |
| Bottom in, bottom out; 1½ inch manifold | SXBBM400SP2in |
Stax Chassis
| Part Number | Description |
| SXLSC02 | Pilot scale without castors |
| SXLSC02W | Pilot scale with castors |
| SXPSC05P | 5 high process scale without castors |
| SXPSC05W | 5 high process scale with castors |
| SXPSC10P | 10 high process scale without castors |
| SXPSC10W | 10 high process scale with castors |
* All capsules are single layer, 58 mm (2.3 in) high
Product Summary
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