Qualitative (e.g., Grade 1)

8–11 μm

Routine lab filtration, removing larger sediments

Good for basic clarity (traps visible particles like sand or grounds)

Fast

Quantitative (e.g., Grade 5 or finer ash-free)

2.5–3.5 μm

Analytical work, gravimetric analysis

Best for high clarity (traps very fine particles, ideal for purifying solutions or beverages like wine)

Medium to slow

Glass Microfiber

0.7–2.7 μm

High-temperature or chemical-resistant filtration

Excellent for ultra-clear results in specialised cases (e.g., air pollution analysis), but less common for liquids

Fast (but requires flat use, not folding)

Specialty (e.g., Wine Filtration)

7–10 μm

Food/beverage clarification

High clarity for consumables, retaining fine sediments while preserving taste

M