Attributes

Brand	-
Category	Stationery, Educational Electronics & Office Supplies / Flat Brushes
Origin	-
Brand	Cuiyuan CY
Model Number	No. 38
Surface Tension Level	38 dyne/cm
Ink Color	Red
Application Type	Surface Tension Testing
Compatible Surfaces	Plastic, Film, Metal, Glass
Pen Tip Material	Felt
Country of Origin	China
Package Contents	1 Dyne Pen
Shelf Life	12 Months (Unopened)

6 reviews

Anonymous

Mar 30, 2026

Rating: 5/5

Reliable domestic brand

I have switched from imported brands to this Cuiyuan CY pen, and the results are identical. It accurately identifies if the surface energy meets the 38 dyne requirement for our adhesive applications.

Anonymous

Mar 20, 2026

Rating: 4/5

Solid performance

Does exactly what a dyne pen should do. We tested it against our calibrated equipment and it was accurate. Just remember to keep the cap tight when not in use to prevent drying.

Anonymous

Mar 19, 2026

Rating: 5/5

Great for printing prep

We use this to ensure our substrates are ready for flexographic printing. The No. 38 level is critical for our ink adhesion, and this pen never fails us. Will buy again.

Anonymous

Mar 18, 2026

Rating: 5/5

Perfect for our quality control line

We use these pens daily to test the corona treatment on our packaging films. The No. 38 rating is consistent, and the red ink provides excellent contrast against clear plastics. Highly recommended for industrial use.

Anonymous

Mar 10, 2026

Rating: 4/5

Good value for money

Works as expected for surface tension testing. The ink flow is smooth. I deducted one star only because the cap feels slightly loose, but it hasn't affected the performance yet.

Anonymous

Mar 09, 2026

Rating: 5/5

Clear and precise

The red color makes it very easy to see where the ink beads up or spreads out. Essential tool for our lab technicians. Delivery was fast too.

5 FAQ

Q: Do you offer bulk discounts for orders over 50 units?

A: Yes, we offer tiered pricing for bulk orders. Please contact our sales team directly through the 'Contact Seller' button on our store page to request a quote for large quantities.

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

A: Once opened, the pen typically remains effective for about 3 to 6 months if the cap is sealed tightly immediately after each use. Exposure to air can cause the solvent to evaporate, altering the dyne level.

Q: Is the ink toxic?

A: The ink contains solvents typical for dyne tests. It should be used in a well-ventilated area. Please refer to the Safety Data Sheet (SDS) included with the product for specific handling instructions.

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

A: If the ink beads up within 2 seconds, it indicates that the surface tension of the material is lower than 38 dyne/cm. You would need to increase the corona treatment or clean the surface further.

Q: Can this pen be used on metal surfaces?

A: Yes, the No. 38 Dyne Pen can be used on metal surfaces to test for cleanliness and oxidation levels before painting or bonding, although it is most commonly used on polymers and films.

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