Convert Bendtsen (mL/min) to Gurley Seconds
Bendtsen (mL/min) and Gurley seconds are inversely related: s/100 mL = 11208.53984 ÷ mL/min (Bendtsen), so 500 mL/min (Bendtsen) = 22.41707968 s/100 mL.
Also searched as Bendtsen to Gurley, ml/min to Gurley seconds and Bendtsen Gurley conversion.
1 mL/min (Bendtsen) = 11208.53984 s/100 mL
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk Bendtsen to Gurley second converter to paste a column from Excel.
How to Convert Bendtsen (mL/min) to Gurley Second
- s/100 mL = 11208.53984 ÷ mL/min (Bendtsen)
- mL/min (Bendtsen) = 11208.53984 ÷ s/100 mL
- Example: convert 500 mL/min (Bendtsen) to s/100 mL: 11208.53984 ÷ 500 = 22.41707968 s/100 mL
Reference conditions. mL/min (Bendtsen): 10 cm² test area at 1.47 kPa (ISO 5636-3); assumes flow proportional to pressure difference. s/100 mL: 100 mL through 6.45 cm² (1 in²) at 1.22 kPa (TAPPI T 460, ISO 5636-5); assumes air flow proportional to pressure difference.
Formula
s/100 mL = 11208.53983988 ÷ mL/min (Bendtsen)
Derivation from SI units:
- Bendtsen reads mL/min through 10 cm² at 1.47 kPa: 1 mL/min ÷ (10 cm² × 1.47 kPa) = 0.011338 µm/(Pa·s).
- Gurley t = seconds for 100 mL of air through 6.45 cm² at 1.22 kPa, so P = 100 mL ÷ (6.45 cm² × 1.22 kPa × t) ≈ 127.08 ÷ t µm/(Pa·s).
- Solving for s/100 mL: s/100 mL = 11208.53983988 ÷ mL/min (Bendtsen) (a higher mL/min (Bendtsen) means a lower s/100 mL)
One unit is a measured value, so the factor is approximate. Bendtsen (mL/min) definition: Bendtsen millilitre per minute; Gurley Second definition: Gurley second.
Worked examples
- A printing paper of 500 mL/min (Bendtsen) is about 22.41707968 s/100 mL.
11208.53984 ÷ 500 = 22.41707968 s/100 mL - A dense paper of 100 mL/min (Bendtsen) is about 112.0853984 s/100 mL.
11208.53984 ÷ 100 = 112.0853984 s/100 mL
Bendtsen (mL/min) to Gurley Second conversion table
| Bendtsen (mL/min) (mL/min (Bendtsen)) | Gurley Seconds (s/100 mL) |
|---|---|
| 10 mL/min (Bendtsen) | 1120.853984 s/100 mL |
| 50 mL/min (Bendtsen) | 224.1707968 s/100 mL |
| 100 mL/min (Bendtsen) | 112.0853984 s/100 mL |
| 200 mL/min (Bendtsen) | 56.0426992 s/100 mL |
| 500 mL/min (Bendtsen) | 22.41707968 s/100 mL |
| 1000 mL/min (Bendtsen) | 11.20853984 s/100 mL |
| 1500 mL/min (Bendtsen) | 7.472359893 s/100 mL |
| 2000 mL/min (Bendtsen) | 5.60426992 s/100 mL |
| 3000 mL/min (Bendtsen) | 3.736179947 s/100 mL |
| 5000 mL/min (Bendtsen) | 2.241707968 s/100 mL |
Where it's used
Bendtsen results in mL/min (ISO 5636-3) are converted to Gurley seconds for customers who specify Gurley. Gurley ≈ 11,208 ÷ Bendtsen mL/min.
Bendtsen (mL/min) to other air permeance units
| Conversion | 1 mL/min (Bendtsen) equals |
|---|---|
| Bendtsen to Gurley second | 11208.53984 s/100 mL |
| Bendtsen to micrometre per pascal second | 0.01133786848 µm/(Pa·s) |
| Bendtsen to Frazier | 0.0002789829843 cfm/ft² @125 Pa |
| Bendtsen to millimetre per second at 100 Pa | 0.001133786848 mm/s @100 Pa |
| Bendtsen to millimetre per second at 200 Pa | 0.002267573696 mm/s @200 Pa |
Frequently asked questions
Is there a fixed Bendtsen to Gurley factor?
Only approximately: both convert to permeance in µm/(Pa·s), giving Gurley ≈ 11,208 ÷ Bendtsen. For 500 mL/min that is 22.41707968 s/100 mL.
What is the formula for Bendtsen millilitres per minute to Gurley seconds?
s/100 mL = 11208.53984 ÷ mL/min (Bendtsen). The two systems are inversely related, so divide the constant by the value; do not multiply. For example, 11208.53984 ÷ 500 = 22.41707968 s/100 mL.
Why does a higher mL/min (Bendtsen) give a lower s/100 mL?
Gurley Seconds counts length per unit mass (an indirect system), while Bendtsen millilitres per minute counts mass per unit length (a direct system). A finer yarn has a higher indirect number and a lower direct number.
Is the mL/min (Bendtsen) to s/100 mL conversion exact?
Not exactly. The Bendtsen millilitre per minute is a measured value (10 cm² test area at 1.47 kPa (ISO 5636-3); assumes flow proportional to pressure difference.). The Gurley second is a measured value (100 mL through 6.45 cm² (1 in²) at 1.22 kPa (TAPPI T 460, ISO 5636-5); assumes air flow proportional to pressure difference.). Results are good to about 5 significant figures.
Sources
- ISO 5636 Paper and board — Determination of air permeance (Part 3: Bendtsen method; Part 5: Gurley method), International Organization for Standardization , Part 3, Bendtsen method.
- ISO 5636 Paper and board — Determination of air permeance (Part 3: Bendtsen method; Part 5: Gurley method), International Organization for Standardization , Part 5, Gurley method.
- TAPPI T 460 om-21 Air resistance of paper (Gurley method), TAPPI .
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Bendtsen (mL/min) to Gurley Seconds. Retrieved October 29, 2026, from https://scientificconverters.com/air-permeance/bendtsen-to-gurley-seconds/
IEEE
Scientific Converters, "Convert Bendtsen (mL/min) to Gurley Seconds," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/air-permeance/bendtsen-to-gurley-seconds/