Texwipe STX1209 is a sterile, dry microfiber cleanroom wiper built around a simple operational objective: lift and hold fine contamination (including oils and fingerprints) with a soft, streak-sensitive surface feel, while controlling edge contribution through a sealed-edge finish. The substrate is an 80% polyester / 20% nylon microfiber blend engineered for higher surface area contact versus conventional knits, which can reduce the number of wipe strokes needed to reach a visual-clean endpoint.

Sterility and traceability are part of the “system,” not an afterthought. STX1209 is gamma irradiated to a sterility assurance level (SAL) of 10^-6, packaged as 100 wipers per bag with four inner bags of 25, and case-level documentation is available to support controlled-environment release and investigations. SOSCleanroom supports that control loop by helping teams standardize the part number, packaging configuration, and replenishment so the wiping step stays consistent across shifts.

STX1209 is intended for critical wiping tasks where sterility, low extractables, and surface safety matter: wiping and cleaning surfaces, equipment, and parts; applying and removing lubricants, adhesives, residues, and other solutions (including disinfectants) per your SOP; and cleaning with common solvents such as IPA, acetone, and degreasers when validated for the surface and process endpoint. Microfiber construction is commonly selected for streak-sensitive cleaning and for surfaces susceptible to scratching where a softer wipe face and controlled technique are required.

Microfiber is not “just another wipe.” Use these drivers to confirm you are selecting STX1209 for the right mechanism (lift + capture) and the right control model (sealed edges + sterile packaging + documentation).

• Contamination-lift mechanism: Microfiber surface area helps capture fine particulate and thin films (oils/fingerprints) so you can reduce wipe strokes and rework.
• Edge strategy (sealed edge): Sealed edges reduce edge-driven particle/fiber contribution, especially important for final wipes and streak-sensitive visual endpoints.
• Sterility model: Gamma irradiation to SAL 10^-6 plus case-level documentation is aligned to controlled-environment release and investigation workflows.
• Packaging architecture: Four inner bags of 25 inside a 100-count bag supports staged introduction into cleaner zones without exposing the whole bag.
• ISO range fit: Manufacturer positioning is ISO Class 3–7 (Class 1–10,000; EU Grade A–D); qualify to your room’s acceptance limits and wiping method.
• Extractables posture: Published typical NVR and ionic extractables are “starting point” data—confirm in your chemistry, contact time, and inspection endpoint.
• Supply status control: If a listing indicates discontinuation, treat it as a change-control trigger and confirm current availability/alternatives before locking a specification.

STX1209 uses an 80% polyester / 20% nylon microfiber blend with sealed edges. In practical wiping terms, microfiber increases fiber surface area and contact points, which supports higher lifting/capturing efficiency for fine contamination and thin films. The nylon fraction contributes toughness and resilience in the microfiber structure, while polyester supports chemical compatibility and dimensional stability in common cleanroom wipe-down chemistries.

The sealed edge is the “quiet” control feature. It reduces edge fray and perimeter contribution, which helps when operators must work close to critical surfaces where edge-first contact can create localized particle spikes or streaking patterns.

Part number: STX1209 (sterile Alpha® 1 Microfiber).
Size: 9" x 9" (23 cm x 23 cm) nominal.
Type: Dry, sterile wiper.
Material: 80% polyester / 20% nylon microfiber.
Edge strategy: Sealed edge.
ISO range (manufacturer positioning): ISO Class 3–7 (Class 1–10,000; EU Grade A–D).
Temperature guidance: Appropriate for use with temperatures less than 400°F (205°C).
Shelf life (sterile, dry): 3 years from date of manufacture.

Packaging (manufacturer TDS and SOSCleanroom listing):
• Bag unit: 100 wipers per bag (4 inner bags of 25).
• Case unit: 5 bags per case (total 500 wipers/case).

In context, the “4 x 25” inner configuration is the operational win. It lets you stage only what you need at the point of use, reduce repeated bag opening events, and preserve sterility/cleanliness controls for the remaining inner bags.

Use wiper metrics as a qualification framework: particles/fibers indicate shedding potential, NVR indicates residue risk, and ionic extractables indicate corrosion/ionic contamination risk. Published values are typical analyses and should be confirmed under your chemistry, contact time, and inspection endpoint.

Typical contamination metrics (Alpha® 1 Microfiber TDS):
• Particles (LPC ≥0.5 µm): 9 x 10⁶ particles/m²
• Fibers (>100 µm): 320 fibers/m²

Nonvolatile residue (NVR):
• IPA extractant: 0.07 g/m²
• DI water extractant: 0.01 g/m²
• Ethanol extractant: 0.01 g/m²

Ionic extractables (typicals):
• Sodium: 0.30 ppm  • Potassium: 0.80 ppm  • Chloride: 0.10 ppm

Absorbency/physicals (typicals): sorptive capacity 350 mL/m²; sorptive rate <0.3 second; basis weight 190 g/m².

Operational interpretation: if your endpoint is “streak-free” visual cleanliness, control wetting (dampen, do not flood), rotate wipe faces aggressively, and avoid reusing a loaded face. If your endpoint includes residue/ionic limits, validate in your actual solvent system and surface energy conditions, then lock acceptance criteria in your incoming controls.

STX1209 is gamma irradiated to SAL 10^-6, with sterility of contents assured if the package is unopened and undamaged. For sterile products, manufacturer documentation (including certificates of compliance/analysis and irradiation) is available at the case level, supporting material release and investigation workflows. Treat packaging integrity as part of the contamination control system: an undamaged seal and disciplined transfer technique often matter as much as the wipe itself.

Microfiber performance is highly technique-dependent. Standardize fold method, wetting limits, and face-rotation rules so cleaning outcomes do not vary by operator.

• Fold for face control: Fold into quarters; treat each face as single-use for a defined area. Rotate faces at the first sign of streaking or visible load.
• Dampen, don’t flood: For solvent wiping, apply controlled wetting. Over-wetting increases streak risk and can mobilize residues outside the intended wipe zone.
• Straight passes with overlap: Wipe clean-to-less-clean using parallel strokes with overlap; avoid circular wiping unless your SOP explicitly calls for it.
• Protect sensitive surfaces: Remove loose particulate first (approved method), keep the wipe face flat, and avoid pressing embedded particles into the surface.
• Define discard triggers: One wipe per defined surface area (or per component) is easier to audit than “wipe until it looks clean.”
• Maintain sterile technique: Open and present the inner bag per your sterile SOP; do not allow outer packaging contact with the sterile field.

Streaking/haze on smooth surfaces: Usually over-wetting, insufficient face rotation, or reusing a loaded face. Correct by tightening wetting control and enforcing a one-face-per-pass rule.

Re-deposition (wiping contamination across the work): Often caused by wiping too large an area with one face or wiping in circles. Correct with defined coverage limits and straight overlapping passes.

Sterility break at point of use: Typically packaging handling errors (outer-to-inner contact, damaged seals, uncontrolled staging). Correct by staging one inner pack at a time and treating damaged packaging as a quarantine event.

Unexpected residue outcome: “Typical” NVR/ionic data may not predict performance in your solvent/contact-time/endpoints. Correct with method-fit validation and, if needed, adjust chemistry or switch to a wipe family validated for that endpoint.

Berkshire MicroPolx® 1900 (polyester/nylon microfiber, sealed edge): A sealed-edge microfiber wiper designed around microfiber “lift” on critical surfaces, emphasizing efficient cleaning with reduced reliance on aggressive solvents. Mechanistically similar (microfiber capture + sealed perimeter), but typically positioned as cleanroom laundered rather than sterile-by-default—confirm sterilization requirements and packaging controls for sterile workflows.

Valutek Ultrasonic-Sealed Low-Texture Microfiber Wiper (polyester/nylon blend, sealed edge): A sealed-edge microfiber platform tuned for low texture and contamination control. Mechanistically, it competes on edge technology (ultrasonic sealing) and microfiber lift for streak-sensitive cleaning. As with any comparator, confirm the sterility model, documentation set, and room-class fit before substitution.

STX1209 fits as a sterile microfiber option in a tiered wiping program where the endpoint is streak-sensitive (visual clarity), surface-safety is a constraint, and sterility/documentation is required for controlled workflows (including USP <797>/<800> environments). Many programs use microfiber for “final appearance” or film-removal steps, then escalate to process-specific sterile wipes and chemistries for disinfectant rotation and residue control, with qualification methods tied to the actual surfaces and inspection endpoints.

Supply note: The SOSCleanroom listing indicates “Discontinued by Texwipe.” Treat that as a change-control signal: confirm current manufacturer status and lead time, and identify an approved alternate (same mechanism + same sterility/documentation posture) before locking a long-term SOP.

• SOSCleanroom product page — Texwipe STX1209 Sterile Alpha 1 Microfiber 9" x 9" Polyester and Nylon Cleanroom Wiper: https://www.soscleanroom.com/product/new-products/alpha-1-microfiber/texwipe-stx1209-sterile-alpha-1-microfiber-9-x-9-polyester-and-nylon-cleanroom-wiper/
• SOS-hosted PDF (stable reference) — Texwipe Alpha® 1 Microfiber Dry | Sterile Technical Data Sheet (TEX-LIT-TDS-040 Rev. 00-05/17; includes STX1209 packaging + typicals): https://www.soscleanroom.com/content/texwipe_pdf/TDS_Alpha1_2017_CuR3.pdf
• Manufacturer PDF — Texwipe Alpha® 1 Wipers / Alpha® 1 Microfiber TDS (TEX-LIT-TDS-040 Rev. 00-05/17): https://www.texwipe.com/images/uploaded/documents/Wipers/Texwipe-Alpha1-Wipers-TDS.pdf
• Manufacturer product page (context + product family positioning): https://www.texwipe.com/alpha-1-stx1209-microfiber-wipers-sterile
• IEST-RP-CC004.3 — Evaluating Wiping Materials Used in Cleanrooms and Other Controlled Environments (test-method context referenced in TDS): https://www.iest.org/
• ASTM E2090-12 — Size-differentiated counting of particles and fibers released from cleanroom wipers (test-method context referenced in TDS): https://www.astm.org/
• ISO 14644-1 / ISO 14644-2 — Cleanrooms and associated controlled environments (classification & monitoring context): https://www.iso.org/
• Berkshire MicroPolx® 1900 datasheet (mechanism comparator): https://berkshire.com/wp-content/uploads/2025/05/MicroPolx1900.pdf
• Valutek Ultrasonic-Sealed Low Texture Microfiber Wiper datasheet (mechanism comparator): https://res.cloudinary.com/iwh/image/upload/q_auto%2Cg_center/assets/1/26/Valutek_VTMFWLTUS-99_DataSheet_0625.pdf