Resin Hose Manufacturer in Japan
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General Questions about Hose/Tube

Question 19: Do you have the information on the recommended outer diameter size of fittings for hose inner diameter size of I.D. 12mm (for instance)?

Answer 19: First of all, we always recommend you to use our original fittings, as the matching between our hose and fittings is guaranteed. However, in case you have no choice but to use the fittings produced by other manufacturers, our recommendation is that a fitting outer diameter size should be about 5-15 % bigger ...

Question 1: What is the lifetime of hose/tube?

Answer 1: We are afraid that we cannot set the general lifetime, since the lifetime of the hose heavily depends on using conditions and using environments. If you find the following features, we strongly recommend that it is time to replace into a new hose. ...Tear, Scratches, swelling, crack, curve, deformation, and exposure of reinforced ...

Question 2: What happens to the working pressure at a higher temperature?

Answer 2: As temperature goes up, hose/tube gets soften, leading to lower working pressure. Each product has technical data regarding "Relationship between Working Temperature and Maximum Working Pressure." Please check this data for each product.

Question 3: How do we cut hose/tube?

Answer 3: You can cut a tube with a tube-cutter. For a hose, you can cut with a knife or a hose cutter. To cut a spring hose, make sure to cut the spring wire off neatly with a nipper.

Question 4: In what ways do we dispose of hose/tube?

Answer 4: In case of disposing, please follow the local governmental regulations.

Question 5: What is the difference between burst pressure and working pressure?

Answer 5: Burst pressure is the value of pressure when hose gets burst after adding pressure to the hose. Usually, a yarn-casting off or pinhole bursting occurs when hoses get burst. Burst pressure is usually as four times as working pressure. Also, depending on the temperature, working and burst pressure might change.

Question 6: Why does the hose change the color into white if the hot water is transferred to the transparent PVC hose?

Answer 6: By pouring the hot water into the hose, the part of water molecule goes into the PVC hose. This is called moisture absorption. The hose looks like white if the water molecule goes into the PVC resin hose due to the fact that a refraction angle changes. If the hose turns white, there ...

Question 8: If there are no HAKKO original fittings for hose, how do we select the best fittings?

Answer 8: Although there are some differences among materials of the hose, it is a good idea to select the fittings whose fittings are 1 - 2mm smaller against the outside diameter of the hose size. PVC hoses are more stretchable than other material hoses.

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

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."

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