NIPPON MUKI
GCW Binder-Free Low-Shedding Heat-Resistant Semi-HEPA Filter (500°C)
Product Overview
GCW is a heat-resistant Semi-HEPA filter rated for continuous 500°C service, with 90% efficiency @ 0.5-1.0 μm. Its glass-fiber media reinforced with stainless-steel mesh makes it an ideal pre-filter for ATMWC-class HEPAs, or a standalone filter for high-temperature applications where sub-HEPA performance is adequate.
Key features
・Continuous operation up to 500°C
・90% @ 0.5-1.0 μm (Semi-HEPA class)
・High-strength build (glass fiber + stainless-steel mesh)
・Ideal ATMWC pre-filter to extend main-filter life
・Binder-free construction: no organic adhesive in media or seal — low particle shedding, no siloxane outgassing
Target industries：Medical, Pharmaceutical, Electronics, Power generation, Nuclear power
Features & Specifications
| No. | Model | Efficiency | W (mm) | H (mm) | D (mm) | Airflow (CMM) | Airflow (CMH) | Initial PD (Pa) |
|---|---|---|---|---|---|---|---|---|
| 1 | GCW-Z-Q-L-F | 90%@0.5-1.0μm | 305 | 305 | 150 | 3.0 | 180 | 245 |
| 2 | GCW-Z-Q-L-F | 90%@0.5-1.0μm | 305 | 610 | 150 | 7.5 | 450 | 245 |
| 3 | GCW-Z-Q-L-F | 90%@0.5-1.0μm | 457 | 457 | 150 | 8.5 | 510 | 245 |
| 4 | GCW-Z-17-L-F | 90%@0.5-1.0μm | 610 | 610 | 150 | 17.0 | 1020 | 245 |
| 5 | GCW-Z-Q-L-F | 90%@0.5-1.0μm | 762 | 610 | 150 | 21.5 | 1290 | 245 |
| 6 | GCW-Z-Q-L-F | 90%@0.5-1.0μm | 915 | 610 | 150 | 26.0 | 1560 | 245 |
| 7 | GCW-Z-Q-L-F | 90%@0.5-1.0μm | 915 | 760 | 150 | 33.5 | 2010 | 245 |
| 8 | GCW-Z-P-L-F | 90%@0.5-1.0μm | 305 | 305 | 290 | 5.5 | 330 | 245 |
| 9 | GCW-Z-P-L-F | 90%@0.5-1.0μm | 305 | 610 | 290 | 13.5 | 810 | 245 |
| 10 | GCW-Z-P-L-F | 90%@0.5-1.0μm | 457 | 610 | 290 | 22.0 | 1320 | 245 |
| 11 | GCW-31-P-L-F | 90%@0.5-1.0μm | 610 | 610 | 290 | 31.0 | 1860 | 245 |
| 12 | GCW-Z-P-L-F | 90%@0.5-1.0μm | 760 | 760 | 290 | 50.0 | 3000 | 245 |
Detailed Description
GCW provides upstream protection for ATMWC HEPA filters, capturing larger particulates to extend the life of the more expensive main filter. All-inorganic construction maintains full-system temperature rating.
Materials & Construction
| Property | Specification |
|---|---|
| Filter frame | STAINLESS STEEL |
| Media | GLASS FIBER (Held by wire net) |
| Max. temperature | 500°C |
| Separator | STAINLESS STEEL |
| Gasket | GLASS PAPER |
| Grille (downstream) | - |
| Grille (upstream) | - |
| Sealant | GLASS FIBER |
| Max airflow | Can be calculated on request |
| Max final PD (Pa) | 400 |
Airflow vs Pressure Drop (representative)
Binder-Free, Low-Shedding Construction
A conventional HEPA bonds and seals its media and frame with polyurethane (PU) or silicone, and those sealants are generally rated for long-term service somewhere in the 100–200°C range. Above that, the adhesive first softens and cracks, releasing organic molecules, then embrittles and flakes under repeated thermal cycling — at which point the filter itself becomes a particle source. GCW uses no organic adhesive anywhere: sealing is done with glass fiber, the frame and separators are stainless steel, and the entire assembly is metal and glass only.| Component | Conventional adhesive HEPA | GCW (binder-free) |
|---|---|---|
| Sealant | Polyurethane / silicone | GLASS FIBER |
| Media bonding | Organic binder | None (glass fiber held by wire net) |
| Separator | Aluminium foil + hot-melt | STAINLESS STEEL |
| Outgassing at temperature | Organic molecules, siloxane | None |
| Shedding after thermal cycling | Rises as adhesive degrades | Stays stable |
With no organic adhesive there is nothing to thermally decompose. Two practical consequences follow:
- Low particle shedding — degrading, flaking adhesive is the most common source of self-generated particles in high-temperature filters. A binder-free build keeps downstream particle counts from creeping back up as the filter ages through repeated heat-up and cool-down cycles.
- No siloxane contamination — silicone seals release siloxane at elevated temperature, and siloxane deposited on wafers, optical surfaces or coated substrates causes hazing and yield loss. Semiconductor, optical coating and OLED processes are particularly sensitive to this.
GCW normally sits upstream of ATMWC, and both stages have to be all-inorganic for the assembly to genuinely hold 500°C. If the upstream stage uses organic adhesive it decomposes first, feeding debris and outgassing straight into the downstream main HEPA — which effectively pulls the whole system's temperature ceiling back down to whatever that adhesive can take.
Applications
- Pre-filter for ATMWC-class high-temperature HEPAs - Medium-stage filtration on high-temperature ovens - Coarse pre-filter for power and nuclear facilitiesSelection Notes
- **150 mm (Q)** — for pre-filtration or constrained depth. - **290 mm (P)** — for extended life or higher airflow.Selection References
Before ordering, verify the efficiency grade, media type, and whether the operating environment fits your requirements.
