Technical data (display method using electroplating symbols)

JIS H 0404 specifies the display method of electroplating.

* Includes autocatalytic electroless plating.

JIS H 0404

Meanings of terms (The meanings of terms used in this standard are as follows, except according to JIS H0400)

1. 1. Types of plating Plating classified according to the type of metal and alloy used for plating.

(Example, copper plating, nickel plating, chrome plating, etc.)

2. Plating Composition Order of Series of Plating Types Assembling Multilayer Plating

(For example, copper / nickel / chrome plating on steel base or zinc alloy base)

3. 3. Plating type Plating of the same type with different properties, forms, methods, etc.

(For example, in nickel plating, bright nickel plating containing sulfur precipitated from a bath to which a brightener is added)

(For example, sulfur-free semi-glossy nickel plating precipitated from a bath with a smoothing agent)

4. Post-treatment The treatment that follows plating. In particular, the post-treatment specified in this standard is limited to the treatment directly related to plating.

(For example, baking to remove hydrogen brittleness, chromate treatment after galvanizing, dyeing, transparent paint finish)

5. Usage environment In the environment where a plated product is used in plating such as decoration and anticorrosion, the surrounding atmosphere that directly or indirectly affects the product.

(For example, highly corrosive outdoor atmosphere, normal indoor atmosphere)

Display method using plating symbols

For the display method using the plating symbols, use the symbols specified below and follow the order shown in (1).

However, for the time being, the order shown in ② may be used.

Symbols that do not need to be displayed may be omitted.


Note 1. A symbol representing electroplating or electroless plating. However, when the plating layer is composed of electroplating and electroless plating, it is a symbol indicating final plating.

Note 2. In the case of multi-layer plating, commas are added from left to right in the order of plating composition closest to the substrate.

When the plating layer is composed of electroplating and electroless plating, if the plating is different from the symbol in Note 1, the symbol representing it is displayed with a hyphen in front of the plating symbol.

(Example: Ep-Fe / Cu 20, Ni 25 b, Cr 0.1r /: A)

Electroplating, steel base, copper plating 20 μm or more, glossy nickel plating 25 μm or more, ordinary chrome 0.1 μm or more, highly corrosive outdoor use

(Example Ep-Fe / Zn 15, / CM 2: B)

Electroplating, steel substrate, galvanized 15 μm or more, colored chromate treatment, normal outdoor use

(Example: Ep-Cu / Ni 5b, Cr 0.1r /: D)

Electroplating, copper alloy base, glossy nickel plating 5 μm or more, ordinary chrome 0.1 μ or more, ordinary indoor use

(Example Ep-Fe / ELp-Ni 15, ICr 20 /)

Final plating is electroplating, steel base, electroless nickel 15 μm or more, industrial chrome plating 20 μm or more

(Example Ep-Al / Cu 10, Ni 10b, Cr 0.1r /: D)

Electroplating, aluminum alloy base, copper plating 10 μm or more, glossy nickel plating 10 μm or more, ordinary chrome 0.1 μm or more, ordinary indoor use


(Example Ep-Fe / Zn [2] / CM2: C

Electroplating, steel base, galvanized second grade, colored chromate, indoor use in high humidity

(Example Ep-Cu / Cr [3] /: B)

Electroplating, copper alloy base, nickel / chrome plating grade 3, normal outdoor use


(1) Symbol representing plating

The symbol for electroplating is Ep or SPLE.

The symbol for electroless plating is ELp or SPLEL.

(2) Symbol indicating the type of substrate

When the base material is a metal, the symbol representing the type of the base material is the element symbol of the metal, and when the base material is an alloy, the element symbol of the main component metal is used.

Example 1: Iron, steel and their alloys Fe

Example 2: Copper and its alloy Cu

Example 3: Zinc and its alloy Zn

Example 4: Aluminum and its alloy Al

Example 5: Magnesium and its alloy Mg

If the base material is plastic, PL is used, and if the base material is ceramics, CE is used.

If it is necessary to indicate the material, heat treatment, and processing conditions for the substrate, mark the substrate symbol with * 1.

Note that the material code specified in the Japanese Industrial Standards for each material and JIS B 0122 (processing method code)

Add the specified processing symbols and conditions.

(Example: Cu * 1 / Ni 5b, Cr 0.1r / Note * 1 Hairline processing is applied to the base brass prior to plating.)

Hairline-processed brass substrate, glossy nickel plating 5 µm or more, ordinary chrome plating 0.1 µm or more

(Example: Fe * 1 / Au 2µm / Note * 1 SUS304)

Stainless steel substrate, gold plating 2µm or more

(Example: PL * 1 / Cu 10b, Ni 15d, Cr 0.1mp / Note * 1 ABS resin)

ABS resin base, glossy copper plating 10 µm or more, double-layer nickel plating 15 µm or more, microporous chrome 0.1 µm or more

(3) Symbol indicating the type of plating

The symbol indicating the type of plating depends on the element symbol.

In the case of alloy plating, the element symbols of the main elements that make up the alloy are connected with a hyphen.

In particular, when the composition of the main alloy element is shown, the numerical value of the mass percentage thereof can be shown by adding () after the element symbol.

Further, for industrial chrome plating, industrial gold plating, decorative gold plating, etc., the symbol defined by each Japanese Industrial Standard can be added before the element symbol.

Furthermore, for special purposes, mark * 2 and add it as a note.

(Example Cu 10, Ni 10s, Cr 0.1r)

Copper plating 10 µm or more, semi-gloss nickel plating 10 µm or more, ordinary chrome plating 0.1 µm or more

(Example Zn-Ni 10)

Zinc-nickel alloy plating 10 µm or more

(Example Au (75) -Cu 5)

Gold 75% -Copper alloy (18K) plating 5µm or more

(Example Cu 10, Ni 5b, Sn-Co 0.1)

Copper 10 µm or more, bright nickel 5 µm or more, tin-cobalt alloy plating 0.1 µm or more

(Example ICr 50)

Industrial chrome plating 50 µm or more

(Example E-Au2)

Industrial gold plating 2 µm or more

(4) Symbol indicating plating thickness

The plating thickness shall be a number indicating the minimum thickness on the effective surface in µm units.

(Example: Cu 10, Ni 15d, Cr 0.1mp)

Copper plating 10 µm or more, double-layer nickel plating 15 µm or more, microporous chrome plating 0.1 µm or more

(5) Symbol indicating the grade according to the thickness of the plating

In the plating standard, when grading is performed by plating thickness, the plating symbol and thickness are indicated by grading.

Example: In the case of nickel plating on steel base ground Grade

Symbol Ni or Cu + Ni thickness µm

Grade 1 Ep-Fe / Ni [1] / 3 or higher

Level 2 Ep-Fe / Ni [2] / 5 or higher

Grade 3 Ep-Fe / Ni [3] / 10 or higher

(6) Symbol indicating the type of plating

The types of plating and their symbols are as shown in Table 1. Other special types are marked with * 3 and added as a note.

Table 1 Plating type and its symbol

Plating type symbol

Glossy plating b
Semi-gloss plating s

Velvety plating v
Non-smooth plating n
Matte plating m

Composite plating cp
Black plating bk

Double-layer plating d
Three-layer plating t

Ordinary plating r
Microporous plating mp
Microcrack plating mc

Crack-free plating cf

(Example Cu 10b, Ni 20t, Cr 0.5mc)

Glossy copper plating 10 µm or more, three-layer nickel plating 20 µm or more, microcrack chrome plating 0.5 µm or more

(7) Symbol representing post-processing

The symbols representing post-processing are as shown in Table 2.

When two or more types of post-processing are performed, each symbol is shown separated by a comma from left to right in the order of processing operations or the order closer to the substrate.

When indicating processing conditions or special post-processing other than Table 2, mark * 4 and add it as a note.

Table 2 Symbols for post-processing

Post-processing symbol

Baking HB for hydrogen removal

Diffusion heat treatment DH
Glossy chromate treatment CM1
Colored chromate treatment CM2

Painted PA
Colored CL
Discoloration prevention treatment AT

Example: Fe * 1 / Zn 10 / HB, CM1, PA * 4

Note * 1 HAR (stress relief annealing) should be applied to the base steel prior to plating. * 4 Apply a transparent urethane coating finish.

Steel substrate, heat treatment, galvanization 10 µm or more, baking, gloss chromate treatment, painting

(8) Symbols representing the usage environment

When plated products are used for decoration, anticorrosion, etc., the usage environment is classified as shown in Table 3 and indicated by symbols.

For use in other special environments, mark * 5 and add it as a note.

Table 3 Usage environment, usage environment conditions and symbols


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