Attributes

Brand	-
Category	Stationery, Educational Electronics & Office Supplies / Flat Brushes
Origin	-
Brand	Sheelon
Origin	Germany
Available Dyne Levels	30, 32, 34, 36, 38, 40 mN/m
Application Method	Brush-on Liquid Test
Primary Use	Corona Treatment Verification
Suitable Substrates	Plastic Films, Foils, and Coatings
Liquid Color	Red
Bottle Material	High-Density Polyethylene (HDPE)
Shelf Life	12 Months Unopened
Storage Temperature	5°C to 25°C

6 reviews

Anonymous

Mar 27, 2026

Rating: 4/5

Solid product

Does the job well. The liquid doesn't evaporate quickly even if left open for a few seconds during testing. Would recommend for industrial use.

Anonymous

Mar 10, 2026

Rating: 4/5

Good quality, fast shipping

The pen works exactly as described. I deducted one star only because the cap can be a bit tight to remove with gloves on, but the liquid quality is excellent.

Anonymous

Mar 06, 2026

Rating: 5/5

Essential for our packaging line

We use these pens daily to check surface tension on our polyethylene films. The results are consistent and the brush tip holds up well over time.

Anonymous

Mar 06, 2026

Rating: 5/5

Accurate and durable

We have been using Sheelon pens for years. This latest batch maintains the high accuracy we expect. Great for verifying treatment levels before printing.

Anonymous

Mar 03, 2026

Rating: 5/5

Reliable German engineering

Switched from a cheaper brand and the difference in consistency is noticeable. The wetting behavior is very clear, making it easy to train new staff.

Anonymous

Mar 01, 2026

Rating: 5/5

Perfect for QA testing

Our quality assurance team relies on these for batch testing. The 38 dyne level is our standard, and this pen gives us confidence in our corona treater settings.

5 FAQ

Q: Is the liquid toxic?

A: The liquid contains formamide and other solvents. It should be handled with care, avoiding eye contact and ingestion. Please refer to the Safety Data Sheet (SDS) included with the product for full details.

Q: Do you sell a kit with all dyne levels from 30 to 40?

A: Yes, we offer a complete test kit containing individual pens for 30, 32, 34, 36, 38, and 40 mN/m levels. You can find it listed under the 'Test Kits' category on our store.

Q: What happens if the liquid beads up instead of spreading?

A: If the liquid beads up within 2 seconds, it indicates that the surface tension of the substrate is lower than the dyne level of the pen. You should try a pen with a lower dyne value to find the correct match.

Q: How long does the liquid last once the bottle is opened?

A: Once opened, we recommend using the pen within 6 months for optimal accuracy, provided the cap is tightly sealed after each use and stored at room temperature.

Q: Can this pen be used on metal surfaces?

A: These pens are specifically designed for non-porous plastic films and coatings. They are not intended for use on metal surfaces as the surface energy dynamics differ significantly.

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