QMA Slotted Collection Substrates for Cascade Impactor, 25/Box SKU: TE-230-QZ

The TE-230-QZ QMA slotted collection substrates are high-purity quartz microfiber filter media specifically designed for particle collection in high volume cascade impactors. These thin flat sheets feature 10 perforated slots that align with impactor stage slots, allowing particles to impact on the collection substrate and be deposited for gravimetric analysis.

Technical Performance

QMA (Quartz Microfiber-Grade A) substrates are manufactured from high-purity quartz microfiber, making them suitable for air sampling in acidic gases, stacks, flues and aerosols, particularly at high temperatures up to 500°C and in PM-10 testing. Due to the low level of alkaline earth metals, "artifact" products of sulfates and nitrates (from SO2 and NO2) are virtually eliminated, making these substrates applicable for particulate monitoring and heavy metal analysis.

Key Specifications

• Material: High-purity quartz microfiber (Grade QMA)
• Configuration: 10 precision-cut slots per substrate
• Maximum operating temperature: 500°C (932°F)
• Package count: 25 substrates per box
• Low alkaline earth metal content for reduced sampling artifacts

Compatibility

These slotted substrates are designed for use with Tisch Environmental Series 230 cascade impactors that attach to standard 8" x 10" high volume air samplers. The Series 230 are multi-stage cascade impactors which attach to any standard high volume air sampler and fractionate particles into as many as six size ranges, providing a simple, accurate and low-cost means of obtaining particle size distribution and respirable mass fraction of suspended particles.

Installation and Use

Collection substrates are carefully placed between the collection plates so that the slots are exposed. The collection substrate is centered over the slots, rough side up. It is recommended to lightly tap each substrate before inserting it into the impactor to shake off any excess fibers. Mass collection is determined by the difference in weight of the collection substrate before and after sampling, with weighing conducted in a clean laboratory environment with a relative humidity of 50% or less.

Applications

High-volume cascade impactors fractionate suspended particulates into as many as six different size fractions, with the slotted impactor design separating particulates from larger than 7.2 µm to less than 0.49 µm while operating at a flow rate of 40 cfm. These QMA substrates are ideal for ambient air quality monitoring, source emission testing, occupational hygiene assessments, and research applications requiring high-temperature resistance and minimal chemical interference.