Cautions:

1. We do not have our original fittings for E-SJ-BK-Inch (except E-SJ-1/4″ $\times$ 3/8″-BK). When you select the fittings, please do not use the joints to seal an outer surface of the tubing. This may result in the bursting or coming off from the tubing. If you need our technical support in selecting the suitable fittings, please fill out this form.
2. When you use our products, please refer to “Precautions for Use.” (“The Precautions for Use” is also available at the product specifications of E-SJ-BK-Inch, which can be downloadable from here.)
3. In terms of chemical resistance, please refer to “Chemical Resistance Data.”
4. Although the inner layer is made of ETFE fluorine, please make sure whether or not E-SJ-BK is usable for high purity fluids before you use.
5. Although the inner layer is resistant to fluids, depending on working environments, the fluids would be permeated through the inner layer, resulting in the danger of swelling and degradation of the middle or outer layer.

### Case Study

Problem: A Single-Layer Teflon Tube is stiff and easy to break.

An UV ink-jet printing manufacturer (called “Company A” hereinafter) was looking for a flexible fluorine tubing for better handling and easy installation. The bending radius should be smaller and hard to break.

HAKKO Solution:

HAKKO proposed E-SJ-BK: Flexible Fluorine (ETFE) Resin Tubing Black and provided a sample. E-SJ-BK is made of three layers: the inner layer is made of ETFE fluorine, the middle layer is made of polyamide and the outer layer is made of polyurethane black. The inner layer shows higher levels of ink resistance. The outer layer is made of polyurethane black, which makes the tubing softer and more flexible. As a result, compared with a teflon tubing, E-SJ-BK is flexible and hard to break. Also, E-SJ-BK can cut the ultraviolet rays, so UV inks do not get harden. After Company A evaluates our E-SJ-BK, E-SJ-BK passed their criteria. Company A decided to use.