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Product Performance

1 Dustproof and waterproof (Ingress Protection Marking: IP code)

All dustproof and waterproof products posted on this website bear ratings which specify the degree of protection provided by enclosure (IP code). These ratings are based on the test method according to JIS C0920 (degree of protection provided by enclosure of electrical machinery and equipment). To maintain performance, use the product in an appropriate way, state, combination, construction and environment. Moreover, this performance cannot be guaranteed while including usage environment. Please remember that aged deterioration and deformation damage degrade the original performance.

Waterproof Sealing Structure

Combination of waterproof plug and waterproof connector body (IP65 equivalent product).

Waterproof rubber housing installed on waterproof flanged inlet (IP65)

IP code

A classified and codified dust-proof and waterproof rating regulated by IEC (International Electrotechnical Commission) and JIS (Japanese Industrial Standards).

2 Flame Retardant Grade

Highly flame-retardant UL94 V-0 class resin is used in many of our products. UL (Underwriters Laboratories. Inc), a non-profit testing organization established by fire insurance companies in the United States to protect human life and property from fire accidents, defines safety standards for electrical products, materials and components, performs evaluation tests, certification and inspections. The standards created by this organization are called UL standards
Among them, the UL 94 standard defines flame retardancy of plastic and other materials in flammability test. In this test flame from a burner is applied to specimens of specified size and quantity, the flame retardancy is evaluated by burning condition, and the flame retardancy grade is indicated by a code.

Flame retardant product marking

Highly flame-retardant UL94 V-0 class nylon resin

3 Tracking resistance

Revised technical standards of the Electrical Appliances and Materials Safety Act made tracking resistance is required for standard insertion plugs and some multi-taps with blades.
In addition to plugs subject to the revised technical standards of the Electrical Appliance and Material Safety Act, we conduct the following tracking resistance test for resin body of other plugs as well.
*Mostly for products with 11 types of pole arrangement designed for ordinary households


Cotton dust and moisture adhering around the plug inserted into outlet causes current flow between blades of the plug. Repeated spark discharges carbonize surface resin of the plug, forming carbonized conductive path (track). This ignition phenomenon is called tracking.

Tracking resistance test

Tracking test
The purpose of the test is to ensure that PTI* index of the insulating material of the plug surface adjacent to outlet and in direct contact with plug blades, specified in JIS C 2134 (Method for the determination of the proof and the comparative tracking indices of solid insulating materials), is 400 or more. The case of PTI of 400 or more includes molded products made from insulation materials with CTI (comparative tracking index) of 400 or more and molded insertion plugs with PTI of 400 or more.
*PTI: Proof Tracking Index. This value indicates the guaranteed voltage in volts that the product under test can withstand after 50 drops of electrolytic solution without tracking breakdown and persistent flame during the measurement period.

Test overview
The voltage is applied between platinum electrodes placed on the sample surface. The electrolytic solution is poured drop by drop in 30 seconds intervals, and the tracking phenomenon is evaluated.

Glow Wire Flammability Test
This test checks conformance of the insulating materials between plug blades with the test specified in JIS C 60695-2-11 or JIS C 60695-2-12 and conducted at a test temperature of 750°C. However, this shall not apply to materials with the glow wire ignition temperature of 775°C level or higher according to JIS C 60695-2-13.

Test overview
The glow wire heated to 750°C by flowing current is pressed to the test sample for 30 seconds, and the flame spreading to the part itself and its surroundings is used like an ignition from inside the product and evaluated .