ASTCH Heat-Resistant Medium Filter (250°C)

Product Overview

ASTCH is a 250°C heat-resistant medium (secondary) filter, available in 85% and 50% efficiency grades (@ 0.4 μm). Typically used as a pre-filter for ATMCH-class 250°C HEPA filters. Key features ・Continuous operation up to 250°C ・85% or 50% efficiency @ 0.4 μm ・Separator-type build (stainless-steel support) ・Standard pre-filter for 250°C HEPA systems 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	ASTCH-Z-90FS4	80%@0.4μm	305	305	150	5.0	300	118
2	ASTCH-Z-60FS4	50%@0.4μm	305	305	150	5.0	300	78
3	ASTCH-28H-90FS4	80%@0.4μm	305	610	150	12.0	720	118
4	ASTCH-28H-60FS4	50%@0.4μm	305	610	150	12.0	720	78
5	ASTCH-Z-90FS4	80%@0.4μm	457	457	150	13.5	810	118
6	ASTCH-Z-60FS4	50%@0.4μm	457	457	150	13.5	810	78
7	ASTCH-28-90FS4	80%@0.4μm	610	610	150	26.0	1560	118
8	ASTCH-28-60FS4	50%@0.4μm	610	610	150	26.0	1560	78
9	ASTCH-Z-90FS4	80%@0.4μm	762	610	150	33.5	2010	118
10	ASTCH-Z-60FS4	50%@0.4μm	762	610	150	33.5	2010	78
11	ASTCH-Z-90FS4	80%@0.4μm	1000	610	150	44.5	2670	118
12	ASTCH-Z-60FS4	50%@0.4μm	1000	610	150	44.5	2670	78
13	ASTCH-Z-90FS4	80%@0.4μm	305	305	290	10.5	630	137
14	ASTCH-Z-60FS4	50%@0.4μm	305	305	290	10.5	630	137
15	ASTCH-56H-90FS4	80%@0.4μm	305	610	290	24.0	1440	167
16	ASTCH-56H-60FS4	50%@0.4μm	305	610	290	24.0	1440	137
17	ASTCH-Z-90FS4	80%@0.4μm	457	610	290	38.5	2310	167
18	ASTCH-Z-60FS4	50%@0.4μm	457	610	290	38.5	2310	137
19	ASTCH-56-90FS4	80%@0.4μm	610	610	290	53.5	3210	167
20	ASTCH-56-60FS4	50%@0.4μm	610	610	290	53.5	3210	137
21	ASTCH-Z-90FS4	80%@0.4μm	762	610	290	67.0	4020	167
22	ASTCH-Z-60FS4	50%@0.4μm	762	610	290	67.0	4020	137
23	ASTCH-Z-90FS4	80%@0.4μm	1000	610	290	89.5	5370	167
24	ASTCH-Z-60FS4	50%@0.4μm	1000	610	290	89.5	5370	137

LINE @baisheng

Email：sales@baisheng-tech.com

Phone：+886-2-25981958

Detailed Description

ASTCH is a 250°C medium pre-filter designed primarily to extend main-HEPA life. Two efficiency grades let users optimize the filter train against the expected particle-size distribution.

Materials & Construction

Property	Specification
Filter frame	STAINLESS STEEL
Media	GLASS PAPER
Max. temperature	250°C
Separator	ALUMINUM
Gasket	PTFE
Grille (downstream)	-
Grille (upstream)	-
Sealant	GLASS FIBER+SILICONE
Max airflow	Can be calculated on request
Max final PD (Pa)	ASTCH-90: 245 (D=150) / 343 (D=290); ASTCH-60: 196 (D=150) / 294 (D=290)

Airflow vs Pressure Drop (representative)

Representative curves for 610×610 mm (50% grade). 290 mm depth provides higher airflow.

Applications

- Pre-filter for ATMCH / ATMCH-SL - Mid-stage filtration on high-temperature HVAC - Upstream filtration for food and medical sterilizers

Selection Notes

- **85% grade** — better protection in finer-dust environments. - **50% grade** — high airflow, low PD, general use. - **150 mm / 290 mm** — select by airflow.