Is It True That Masks Last Just One Day?

ओह! यह पोस्ट हिन्दी में उपलब्ध नही हैं।अंग्रेजी संस्करण के हेतु यहाँ क्लिक करे l

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David

If changing the straps on this model, to a far more durable fabric-elastic material (used on other 3M models), they can be used in excess of a month. Try re-testing after a month or two. In conversation with 3M reps here in Taiwan, they’ve suggested that the filtration effectiveness increases over time, though the breatheability declines. There’s a logic there, as the membrane becomes infiltrated with particles, blocking transparency in either direction. Please do test again after 4-6 weeks.