00124Reusable RespiratorFebruary, 2026(2026.2) Gas respirator removes airborne contaminants by a gas filter to provide clean air for breathing. Our gas respirators have superior reputation for quality excellence and are favored in a variety of industrial fields. Products by Shigematsu Works have been approved by the Japanese Ministry of Health, Labour and Welfare. Gas filters that are not prescribed by the Japanese Ministry of Health, Labour and Welfare are in accordance with JIS T 8152. The breakthrough time of a gas filter is influenced by a variety of factors, such as the gas concentration, breathing volume, ambient temperature and humidity. Among them, the gas concentration is the most influencing factor.In general, the breakthrough time of a gas filter is long at low gas concentration and short at high concentration. Measure the gas concentration at your workplace, and calculate the breakthrough time from the figure.When the accumulated used time reaches the calculated breakthrough time, please dispose the gas filter.3 Gas filters for methanol shall be disposed of after one-time use.■ Example of Breakthrough Graph for Gas Filter ■ Favorable Storage Conditions■ How to Calculate the Approximate Service Life■ Shelf Life after the Manufacturing DateDirect-Mounting Small TypeSee P.15Direct-Mounting Small TypeX/OV filter for Organic VaporsTest Conditions: Temp.: 20 ± 2 ˚CHumidity: 50 ± 5 % RHAir flow rate: 30 L/min.2001. Unopened2. No damage on package3. No rust or deformation appears on filters (Dispose of any filter not meeting any of conditions 1 to 3.)4. Stored under normal conditions (no vibration, room temperature and humidity)* The gas filter packaging may burst if the storage temperature exceeds 50 ˚C.* The above criteria are not exhaustive, please use the proper criterion or several criteria depending on the situation of the work site.30 %min. = 60 min. 0.5 %1) When gas concentration is constantex) If a gas concentration in an atmosphere is 0.5 % and the breakthrough time is 50 min. against 2 % gas: The original performance = 2 % × 50 min. = 100 %min. If it is used against 0.5 % gas, 100 %min. = 200 min.0.5 %When the accumulated used time reaches the predetermined breakthrough time.1. Do not rely on odor as criteria for replacing a gas filter, as there is a risk of not detecting a dangerous presence of harmful gas.2. Immediately cease use if you sense any gas odor or irritation during use.0.100.080.060.040.0240Note: 1) This graph indicates that a gas filter can be used for approx. 150 min. if the concentration of cyclohexane is 0.02 % (200 ppm) in an atmosphere.2) The actual breakthrough time will differ depending on temperature and humidity at the workplace.See P.3 : Explanation of Marks Five-Digit No. : Product Code ★ : Made-to-Order80120(150) 1602 ) When gas concentration changesex) If a gas filter with 120 min. breakthrough time in 0.5 % gas is used for 20 min. in 1 % gas first, and then for 40 min. in 0.25 %, what is the remaining service life for 0.5 % gas? The original performance = 0.5 % × 120 min. = 60 %min. The remaining performance = 60 %min. - 1 % × 20 min. - 0.25 % × 40 min. = 60 %min. - 20 %min. - 10 %min. = 30 %min. The remaining Shelf Life =When the weight of the used gas filter increases due to moisture or absorption of airborne contaminants.(Can not be applied for moistureproof-type gas filter)For combined filters, when inhalation resistance increases and breathing is difficult even if the accumulated used time has not reached the predetermined breakthrough time.2 yearsExcept, 1 year for methanol and ethylene oxide filters12How to Read the Breakthrough FiguresGas Filter Replacement CriteriaShelf Life of Gas FiltersReusable Respirator for Gas
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