{"id":999,"date":"2025-06-16T13:43:02","date_gmt":"2025-06-16T04:43:02","guid":{"rendered":"https:\/\/hem.co.jp\/global\/?page_id=999"},"modified":"2025-09-24T17:02:38","modified_gmt":"2025-09-24T08:02:38","slug":"e-special-ic-sk","status":"publish","type":"page","link":"https:\/\/hem.co.jp\/global\/e-special-ic-sk","title":{"rendered":"Oxygen-Free Copper (OFC) Battery Terminals \u2013 Ionis-Coat \/ SK Specifications"},"content":{"rendered":"\n

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Battery Terminals Preferred by Auto Electrical Repair Professionals<\/h1>\n<\/div>\n<\/div>\n\n\n\n
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Oxygen-Free Copper (OFC) Battery Terminals \u2013 Ionis-Coat \/ SK Specifications<\/h2>\n<\/div>\n<\/div>\n\n\n\n
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Oxygen-Free Copper (OFC) Battery Terminals \u2013 Bolt Type
DTPL-SK Series \/ DTPS-SK Series<\/p>\n\n\n

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Oxygen-Free Copper (OFC) Battery Terminals \u2013 Multi Type
DMPL Series \/ DMPS-SK Series<\/p>\n\n\n

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Note: The bolt-type Ionis Coat \/ SK specification is scheduled for future release.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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\nA supreme creation born from the synergistic integration of highly conductive oxygen-free copper and an advanced corrosion-resistant alloy plating\u2014engineered for the next level of performance.\n<\/div>\n\n\n\n

To ensure the stable and efficient transmission of power from lead-acid batteries used in automobiles and other vehicles to various electrical components, these battery terminals are made from the highest-grade oxygen-free copper (OFC), which boasts a purity of 99.96% or higher and contains minimal impurities and additives. OFC is widely recognized for its exceptional electrical conductivity. The terminals also feature a superior surface treatment that offers corrosion resistance equivalent to stainless steel (SUS304). Manufactured in Japan to meet Hero Electric\u2019s rigorous quality standards, they deliver unparalleled performance and reliability.<\/p>\n\n\n\n

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In 1988, Hero Electric became the first in the industry to adopt highly conductive oxygen-free copper (OFC) as the base material for automotive replacement battery terminals\u2014pioneering a new standard in the aftermarket. Since then, we have consistently dedicated ourselves to improving power transmission efficiency. With over 30 years of proven performance in Japan\u2019s automotive aftermarket, our terminals are widely acclaimed for meeting the demanding expectations of frontline professionals and continue to earn their trust to this day.<\/p>\n\n\n\n

As modern vehicles demand increasingly greater electrical power than in the past, the lead-acid batteries that supply this energy are trending toward being more compact and higher in performance. In response to these evolving needs, Hero Electric remains committed to pursuing exceptional \u201cquality\u201d and \u201cdurability\u201d to ensure that our products consistently deliver reliable performance under all conditions.<\/p>\n<\/div>\n\n\n\n

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\"MADE IN JAPAN\" \u2013 a mark of trust and reliability<\/h3>\n\n\n\n
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By integrating the extensive knowledge and specialized expertise that Hero Electric has cultivated over more than half a century into every aspect of the design phase\u2014and manufacturing exclusively at domestic facilities under innovative technologies and a rigorous, comprehensive quality control system\u2014we achieve exceptionally high precision and reliability in the products themselves.<\/p>\n<\/div>\n\n\n\n

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To meet the supreme mission of achieving both \"quality\" and \"durability\" as professional-use products, all of our products are designed and developed entirely in-house.<\/p>\n<\/div>\n<\/div>\n\n\n\n

Uses Oxygen-Free Copper (OFC) with impurities removed to the utmost limit<\/h3>\n\n\n\n

For the first time in Japan's automotive aftermarket industry, we adopted Oxygen-Free Copper (OFC) as the core material for our battery terminal bodies. OFC is significantly purer and more conductive than standard copper, and is widely used in electronics and high-performance cables.<\/p>\n\n\n\n

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Oxygen-Free Copper (OFC) Main Body<\/figcaption><\/figure><\/div><\/div>\n\n\n\n
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Multi-Conversion Plate<\/figcaption><\/figure><\/div><\/div>\n<\/div>\n\n\n\n

Images are for illustration purposes.<\/em>
Not available for sale in bare (non-plated) form.<\/p>\n\n\n\n

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What is Oxygen-Free Copper (OFC) ?<\/h4>\n\n\n\n
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Oxygen-Free Copper (JIS H 3100, C1020)<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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High-purity copper with a purity of 99.96% or more<\/h5>\n\n\n\n

Oxygen-Free Copper is an exceptionally pure type of copper with minimal trace elements, impurities, and oxygen, resulting in a significantly higher purity compared to general copper.<\/p>\n\n\n\n

High Electrical Conductivity<\/h5>\n\n\n\n

Oxygen-Free Copper has excellent electrical conductivity and is widely used in electronics, wiring, and conductors. Its high conductivity allows efficient transmission of electrical signals.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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\u25a0Types, Grades, and Symbols of Materials Used in Oxygen-Free Copper (OFC) Battery Terminals<\/h5>\n\n\n\n
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Name<\/th>\n\t\t\tType<\/th>\n\t\t\tGradea)<\/sup><\/th>\n\t\t\tType Symbol<\/th>\n\t\t\tKey Features and Representative Applications (Reference Only)<\/th>\n\t\t<\/tr>\n\t\t
Alloy Number<\/th>\n\t\t\tForm<\/th>\n\t\t<\/tr>\n\t\t
Oxygen-Free Copper (OFC) <\/td>\n\t\t\tC1020<\/td>\n\t\t\tStrip<\/td>\n\t\t\tStandard Grade<\/td>\n\t\t\tC1020Rb)<\/sup><\/td>\n\t\t\tIt has excellent electrical and thermal conductivity, ductility, and drawability. It also offers good weldability, corrosion resistance, and weather resistance. Even when heated to high temperatures in a reducing atmosphere, it does not risk hydrogen embrittlement.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

(Reference): Japanese Industrial Standard JIS H 3100:2018 Copper and Copper Alloy Plates and Strips<\/p>\n\n\n\n

[Note]
b) For plates and strips used for electrical conduction, a \"C\" shall be added after the type symbols P, PS, R, or RS.<\/p>\n\n\n\n

\u25a0 Chemical Composition of Oxygen-Free Copper (Alloy Number: C1020)<\/h5>\n\n\n\n
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Alloy Number<\/th>\n\t\tChemical Composition (%)<\/th>\n\t
Cu<\/th>Pb<\/th>Fe<\/th>Sn<\/th>Zn<\/th>Al<\/th>Mn<\/th>Ni<\/th>P<\/th>Zr<\/th><\/tr>\n\t
C 1020<\/td>\"Minimum99.96%\"<\/td>\uff0d<\/td>\uff0d<\/td>\uff0d<\/td>\uff0d<\/td>\uff0d<\/td>\uff0d<\/td>\uff0d<\/td>\uff0d<\/td>\uff0d<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

(Reference): Japanese Industrial Standard JIS H 3100:2018 Copper and Copper Alloy Plates and Strips<\/p>\n\n\n\n

\u25a0 Mechanical Properties of Materials Used in Oxygen-Free Copper (OFC) Battery Terminals<\/h5>\n\n\n\n
\n\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t
Alloy Number<\/th>\n\t\tGrade<\/th>\n\t\tProduct Symbol<\/th>\n\t\t Tensile Test<\/th>\n\t\tBending test a)<\/sup><\/th>\n\t\tHardness test a)<\/sup>(for reference)<\/th>\n\t<\/tr>\n\t
Thickness<\/span> Rangemm<\/th>\n\t\tTensile Strengthb)<\/sup><\/span>N\/mm2<\/sup><\/th>\n\t\tElongationb)<\/sup><\/span>\uff05<\/th>\n\t\tThickness<\/span> Rangemm<\/th>\n\t\tBending Anglee)<\/sup><\/th>\n\t\tInner Radiuse)<\/sup><\/th>\n\t\tThickness<\/span> Rangemm<\/th>\n\t\tVickers Hardnessb)<\/span><\/sup>HV<\/th>\n\t<\/tr>\n\t
C1020<\/td>\n\t\t\u00bdH<\/td>\n\t\tC 1020P-\u00bdHd)<\/sup>C 1020PS-\u00bdHd)<\/sup><\/td>\n\t\t0.10~<0.15<\/td>\n\t\t235~315<\/td>\n\t\t-<\/td>\n\t\t0.10~2.0<\/td>\n\t\t180\u00b0<\/td>\n\t\t1xThickness<\/span><\/td>\n\t\t0.20~20<\/td>\n\t\t75~120e)<\/sup><\/td>\n\t<\/tr>\n\t
0.15~<0.30<\/td>\n\t\t\u226710<\/td>\n\t<\/tr>\n\t
0.30~20<\/td>\n\t\t245~315<\/td>\n\t\t\u226715<\/td>\n\t<\/tr>\n\t
C 1020R-\u00bdHd)<\/sup>C 1020RS-\u00bdHd)<\/sup><\/td>\n\t\t0.10~<0.15<\/td>\n\t\t235~315<\/td>\n\t\t-<\/td>\n\t\t\u22670.20<\/td>\n\t<\/tr>\n\t
0.15~<0.30<\/td>\n\t\t\u226710<\/td>\n\t<\/tr>\n\t
0.30~4.0<\/td>\n\t\t245~315<\/td>\n\t\t\u226715<\/td>\n\t\t\u22664.0<\/td>\n\t<\/tr>\n<\/table>\n<\/figure>\n\n\n\n

(Reference): Japanese Industrial Standard JIS H 3100:2018 Copper and Copper Alloy Plates and Strips<\/p>\n\n\n\n

[Notes]
a) Products that fall outside the specified thickness categories are not subject to bending or hardness tests.
b) Numerical values are rounded to the nearest whole number.
d) Also applicable to plates and strips used for electrical purposes.
e) Minimum test force is 1.961 N. <\/p>\n<\/div>\n<\/div>\n\n\n\n

[Reference] Comparative Table of Conductivity of Various Materials Commonly Used for Battery Terminals<\/h5>\n\n\n\n
Comparative Materials<\/th>\nOxygen-Free Copper (OFC)
(Material used in our products)<\/td>\n		Brass<\/td>\nZinc Alloy Die-Cast<\/td>\nLead<\/td><\/tr>\n
Material Conductivity (% IACS)<\/th>\n\t101%<\/td>\n\t28%<\/td>\n\t26%<\/td>\n\t9%<\/td><\/tr>\n<\/tbody><\/table><\/figure>\n\n\n\n

*1. IACS refers to the International Annealed Copper Standard, which defines 100% IACS as the conductivity of annealed standard copper.
*2. The above values are general reference values and not absolute (guaranteed) values.
(*Note) Cu-Zn alloys are referred to as brass; the academic term is \"\u9ec4\u9285\" (\u014dd\u014d).
\u3000\u3000\u3000\u3000\u3000(Reference): Osawa, Nao. \"Illustrated Introduction to the Basics and Mechanisms of Copper.\" Shuwa System, 2010, p.106.<\/p>\n\n\n\n

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[Point] Easy-to-understand conductivity explained with illustrations<\/h5>\n\n\n\n

Conductivity can be compared to \"road width,\" where smoother traffic flow represents higher efficiency.<\/p>\n\n\n\n

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Copper is a critical material for realizing a sustainable, decarbonized society through renewable energy and electric vehicles<\/h3>\n\n\n\n
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\u25a0Renewable Energy Generation
Copper plays a vital role in renewable energy systems. Solar and wind power equipment requires large amounts of copper wiring. Copper's high conductivity and durability enhance the efficiency and sustainability of renewable energy generation.<\/p>\n\n\n\n

\u25a0Electric Vehicles and Charging Infrastructure
Copper is an essential material in the production of electric vehicles. Motors, batteries, and charging infrastructure for electric vehicles require large amounts of copper. Its excellent conductivity and durability contribute to improved performance and efficiency in electric vehicles.<\/p>\n\n\n\n

\u25a0Electronic Devices
Copper is also essential in electronics manufacturing. Copper wiring is used in computers, smartphones, and TVs. Its excellent heat conduction makes it suitable for use in cooling systems. As high-performance electronics become increasingly important in a decarbonized society, copper plays a crucial role in supporting this demand.<\/p>\n\n\n

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Surface coated with \"Ionis Coat \/ SK\" offering corrosion resistance equivalent to stainless steel (SUS304)<\/h3>\n\n\n\n

The surface of the oxygen-free copper (OFC) is treated with Ionis Coat \/ SK, a highly corrosion-resistant composite alloy plating.This advanced coating offers corrosion resistance equivalent to that of stainless steel (SUS304), ensuring excellent protection against rust.In addition, it features a thin-film structure with self-healing properties, providing enhanced resistance to surface scratches.<\/p>\n\n\n\n

What is Ionis Coat \/ SK?<\/h4>\n\n\n\n
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Ionis Coat \/ SK is an advanced next-generation surface treatment offering excellent corrosion resistance, protection against galvanic corrosion, and self-healing capabilities.<\/p>\n\n\n\n

A trivalent chromate process is applied to a zinc-nickel alloy base, followed by a topcoat containing a water-soluble silica-based rust-proof coating. Even if the plating layer is scratched, the topcoat dissolves to cover the damaged area, providing self-healing protection.<\/p>\n\n\n\n

Ionis Coat \/ SK is now widely used across a variety of applications.One prominent example is its adoption as a surface treatment for fastening screws used in the installation of mega solar panels, which are exposed to harsh environmental conditions over long periods.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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*Note: Deep scratches that physically peel off the topcoat or cut through it\u2014such as those caused by tools or sharp objects\u2014will not self-heal.<\/p>\n<\/div>\n<\/div>\n\n\n

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Verification conducted using our proprietary composite cycle test (See details: Test materials \u2013 DTPL-1S and DTPL-1SK)<\/h3>\n\n\n\n
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[General View of the Composite Cycle Test Apparatus]<\/p>\n\n\n\n

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(Image used with permission from Suga Test Instruments Co., Ltd.)<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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Condition during testing<\/p>\n\n\n\n

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