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Category:	General Sampling FAQ
Sub-category:	General Sampling FAQ
SKC Catalog Number:
Question:	Can the representative sample media used for calibration be used more than once?
Answer:	Yes. Most users keep on-hand sorbent tubes and filters of various types labeled "calibration unit." They use them for months. Calibration media is only used to mimic the back pressure of the collection media.

Category:	General Sampling FAQ
Sub-category:	General Sampling FAQ
SKC Catalog Number:
Question:	Air sampling programs: What training materials are available from SKC to help me begin my own?
Answer:	Listings and links to all SKC Training materials for beginners can be found on the Help with Air Sampling Page

Category:	General Sampling FAQ
Sub-category:	General Sampling FAQ
SKC Catalog Number:
Question:	Material Safety Data Sheets: Can I get a MSDS on specific materials?
Answer:	SKC has all necessary MSDSs on file. Note that sorbent tubes and detector tubes are exempt from OSHA requirements for MSDSs because they are considered an "article". Exemption letters are also on file.

Category:	General Sampling FAQ
Sub-category:	General Sampling FAQ
SKC Catalog Number:
Question:	What is the action level?
Answer:	The action level is typically one-half the permissible exposure level. When exposures reach or exceed the action level, additional requirements apply, including medical surveillance, air monitoring, etc. Simply put, it is the concentration at which you must take some action.

Category:	General Sampling FAQ
Sub-category:	General Sampling FAQ
SKC Catalog Number:
Question:	What is the difference between respirable and total dust sampling?
Answer:	Total dust sampling, in the traditional usage, refers to all dust particles that can be effectively collected using a filter cassette. Respirable dust refers to those dust particles small enough in size to get through the protective mechanisms of the nose upper airways and reach the gas exchange region of the lung. Respirable dust is collected using a cyclone. Some chemicals have total dust standards and some have both, depending on their potential health effects. In recent years, the ACGIH has been examining three dust size-fractions: Inhalable dust particles are those materials that are hazardous when deposited in the respiratory tract including the nose and mouth. Thoracic dust particles are those materials that are hazardous when deposited within the lung airways and the gas-exchange region. Respirable dust particles are those materials that are hazardous when deposited in the gas-exchange region .

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