No gas used in the atmosphere! Metal flat gaskets with no worries about hydrogen embrittlement.
"NAPI Metal Flat Gasket" does not use gas in the atmosphere, so there is no concern about hydrogen embrittlement. It is mainly produced by pressing tough pitch copper plates (thicknesses of 1.0t, 1.5t, 2.0t) to punch out the outer and inner diameters, followed by trimming (with small diameters polished in a barrel), and then heat annealed in a vacuum to provide products with a stable quality at a hardness of Hv40 to 45. We also offer "copper gaskets," as well as "best gaskets/head gaskets" and "metal shims (stainless steel, iron, brass, etc.)." 【Features】 ■ For JIS, JPI, and PN standards ■ Provides products with stable quality at a hardness of Hv40 to 45 ■ Heat annealed in a vacuum, with no gas used in the atmosphere ■ No concern about hydrogen embrittlement ■ Also manufactured by pressing aluminum, SUS, etc. *For more details, please refer to the PDF document or feel free to contact us.
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【Lineup】 ■ Copper packing (Tough pitch copper, oxygen-free copper, etc.) ■ Best gasket / head gasket ■ Metal shims (stainless steel, iron, brass, etc.) *For more details, please refer to the PDF document or feel free to contact us.
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【Applications】 ■ Standard Annealing: For diesel engines, two-wheeled vehicles, four-wheeled vehicle engines, etc. ■ Special Annealing: Copper gaskets for automobiles (when the flange side material is aluminum alloy, etc.) *For more details, please refer to the PDF document or feel free to contact us.
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Asbestos testing in Japan is conducted using the JIS method, which employs "X-ray diffraction" and "phase contrast and dispersion microscopy." However, this method has been criticized for its flaws, such as misidentifying other particles as asbestos and potentially missing asbestos content below 5%. Therefore, even products deemed non-asbestos in Japan may be determined to contain asbestos when tested using the polarized light microscopy (PLM) method, which is recognized as a more reliable method in Europe and the United States. To avoid such situations, a standard called "Zero Asbestos," which ensures that products contain no asbestos and have passed inspections using polarized light microscopy (PLM) and even more reliable electron microscopy, is gaining traction. In July 2012, an ISO asbestos analysis method was published, and the JIS method was excluded, accelerating this movement domestically. In anticipation of this trend, our company has obtained the trademark for "Zero As" and has promptly introduced inspections using polarized light microscopy and electron microscopy. Since 1990, all our products have been certified as Zero Asbestos, so please use the "Zero As Gasket NAPI Series" with confidence.