General Questions about Hose/Tube

Question 9: Our PVC hoses breed mold. How do we solve this problem?

June 02,2018 General Questions about Hose/Tube

Answer 9: PVC hoses contain the plasticizer. The plasticizer itself is a feed for bacteria to breed mold. If you would like to solve this problem, we strongly recommend you to adopt non-PVC hoses. Non-PVC hoses do not contain the plasticizer. Please select either "KY Hose Series" or "Flexible Fluorine Resin Hose Series."

Question 10: What is the difference between hose and tubing?

June 02,2018 General Questions about Hose/Tube

Answer 10: Hose contains reinforced materials such as yarn and spring wire. On the other hand, tubing does not contain any reinforced material.

Question 11: What is the difference between PVDF fluorine and ETFE fluorine?

June 02,2018 General Questions about Hose/Tube

Answer 11: Both PVDF and ETFE are types of fluorine. Compared with PVDF fluorine, ETFE fluorine has greater chemical resistance. ETFE fluorine stands proof against some type os solvents such as Ketone and Acetone.

Question 12: What is fluorine? What are its characteristics?

June 02,2018 General Questions about Hose/Tube

Answer 12: Fluorine is a material, which shows high chemical resistance, non-adhesiveness, and water-repellent properties.

Question 13: Why does PVC hoses get harden as time passes by?

November 12,2018 General Questions about Hose/Tube

Answer 13: PVC hose is originally very soft, because it contains plasticizer. However, plasticizer gradually flows out as the hose transfers oil or the hose exposed to the sun. Once the certain amount of plasticizer flows out, the hose turns hard.

Question 14: Why did you develop a multi-layer tube or hose?

November 12,2018 General Questions about Hose/Tube

Answer 14: A multi-layer tube or hose allows to add more than one function. For instance, customers have used teflon tube for high chemical resistance. However, they suffer from the problem of hardness. Our E-SJ, which is made of ETFE fluorine and PU, has both characteristics: high chemical resistance and flexibility.

Question 15: What is minimum bend radius? What is the definition?

October 29,2020 General Questions about Hose/Tube

Answer 15: Minimum bend radius is NOT equal to product softness (flexibility). The value of Minimum Bend Radius is defined as the radius (R) when (d') is multiplied by 95% at room temperature (HAKKO Internal Rule). Thus, Minimum Bend Radius is the index to measure the flatness of the tubing or hose. The more flat ...

Question 16: We are quite not sure about the unit (MPa, Bar, PSI and Feet). Do you have a unit conversion table?

October 30,2020 General Questions about Hose/Tube

Answer 16: Yes, please refer to the following table. Unit A is almost equal to Unit B.

Question 17: What is UL94 regulation?

November 30,2020 General Questions about Hose/Tube

Answer 17: UL94 is a "Test for Flammability of Plastic Materials for Parts in Devices and Appliances." There are six flammability standards (UL94-5VA, UL94-5VB, UL94-V0, UL94-V1, UL94-V2 and UL94-HB). UL94-5VA is the most inflammable standard, while UL94-HB is the most flammable standard. We can produce a hose/tubing that meets your required flammable standard.