Resin Hose Manufacturer in Japan

Questions and Answers

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General Questions about 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 yarns due to abrasion. The bursting of inner layer and/or outer layers of the hoses, hardening, dramatic change in color, and leaking fluids.

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.

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.

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

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.

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 is no functional problem. Also, as time passes by, moisture evaporates. As a result, hose returns to the normal color. For your information, in addition to PVC, polyurethane (PU) and nylon have higher levels of moisture absorption.

Answer 7: Each tube has a cut mark.

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.

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.

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

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.

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

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.

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 flexibilitiy.

Made-to-Order Hose

Answer 1: Yes. In case you cannot find the appropriate hose, we can manufacture a made-to-order hose which is tailored to your needs. Please fill out the following form from below.

Answer 2: The minimum production lot varies depending on the hose size. Usually, the MOQ for production lot is 1,000m. However, we can manufacture a hose even if the quantity is not reaching the MOQ. Please request the quantity you need.

Answer 3: It usually takes at least one month to manufacture. However, if your hose requires special materials, the production lead time might be longer than one month. For more information on this made-to-order process, please visit “Made-to-Order Tube/Hose” webpage.

Regulations and Certificate

Answer 1: “SDS” stands for “Safety Data Sheet.” “Safety Data Sheet” is a material-based datasheet.

Answer 2: Yes, we can issue a certificate of RoHS 2 compliance. Please fill out the form from below. 

Answer 3: Yes, we can issue a certificate of REACH or SVHC. Please fill out the form from below.

Answer 4: Yes, we can issue this certificate upon request. Please send your request from this form.

Answer 5: Yes, you can download online. Please visit each product page and click “Food Grade Certificate Request.”

Answer 6: No. HAKKO products are not certified with UL. However, we can provide a third-party UL certificate for some products. Please fill out the form from below.

Answer 7: We are sorry to inform you that HAKKO products are not compliant with FDA.

Answer 8: Yes. All HAKKO standard catalog products are DOP (DEHP) free.

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