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Reference data regarding the minimum bending radius is provided in Table 3-4 below, which can be used when bending FPCs with a die, etc. The Copper foil thickness is 3µm and the substrate is PET. However, it must be noted that the data is provided for reference purposes only and is not a guaranteed value.

Minimum bending radius R [mm] 0.5

Reference data on the anti-ionic migration characteristic of the product is provided in Table 3-5 below. Please note, however, that the data is provided for reference purposes only and these are not guaranteed values. The test pattern used consisted of interdigital electrodes placed at 0.5 mm intervals, to which a voltage of 50 V was applied.

While silver is used in the seed layer, copper coating is subsequently applied using electroless plating all over the surface. Therefore, no ionic migration of silver will occur under normal circumstances.

Condition Observation of ionic migration
85°C 85%Rh 1440 hours None observed

Reference data on peel strength between the substrate and the copper pattern is shown in Table 3-6. However, the peel test is based on JIS-K5600 (cross cut method).

Substrate Peel strength
PI Passed peel test
PET Passed peel test

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About P-Flex®

P-Flex® is a single-face flex PCB manufactured using the Pure Additive™ method. Conventionally, electronic circuits have been manufactured by applying a method known as lithography, in which a thin metallic sheet is first applied to the board surface, and then unrequired sections are melted away.


The Pure Additive™ method (*) developed by Elephantech is a concept completely opposite to what had been used until now, using a proprietary manufacturing technology that prints metal nanoparticles with inkjet only on the necessary parts and grows metals by electroless plating technology.
(* Patent No. 6300213)

By reducing the amount of metal, liquid waste and man-hours, we can lessen manufacturing costs and shorten the lead time.
Elephantech will continue to reduce its environmental burden and contribute to the achievement of SDGs.

P-Flex® manufacturing specifications
Substrate Transparent heat-resistant PET film: 50 µm thick, 125 µm thick
PI (Polyimide) film: 25 µm thick
Line width / spacing 200/200 μm min., 200/150 μm min. (option)
Hole diameter 0.5 mm min.
Outline-pattern spacing 0.3 mm min.
Copper foil thickness 3 μm (please consult us if you require a thickness of more than 3 µm)
Panel size 180 × 270 mm max.
Wiring layer Single-sided
Soldermask coating UV inkjet printing (green) (waterproof graded soldermask coating is possible for special items)
Transparent, black and white soldermask coatings by silkscreen printing for PET substrate are also under development and may be available upon request.
Legend printing UV inkjet printing (white)
Surface finish Oxidation prevention treatment, Electroless nickel gold plating (option)
Outline cutting / Hole drilling Laser cutting
Stiffeners When specifying the thickness of the connector part, film stiffeners can be used to adapt to connectors of 200 µm or 300 µm in total thickness.
Component mounted parts and such can be adapted by using FR4 stiffeners of 0.1, 0.3, 0.5, 1.0, and 1.6mm in thickness.
Other stiffeners, electromagnetic wave shield film, double-sided tape and such are also available.
Inspection Visual inspection + opens/shorts test
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Company information
Name Elephantech Inc.
Establishment January 2014
Address 4-3-8 Hatchobori, Chuo-ku, Tokyo 104-0032, Japan
Capital JPY 310,000,000
Representative Shinya Shimizu, CEO
Business description Development of printed electronics manufacturing technology and provision of related services