What is the response to the prevention of silent change of the AC adapter and used parts?

This page explains our measures against so-called silent change. In UNIFIVE, risk management related to global procurement is thoroughly carried out.

In recent years, with the globalization of procurement, risks due to "Silent Change" are emerging, mainly in large companies such as electric machinery. There is an accident etc. which caused the problem of heat generation by replacing the resin material used for the DC plug part which is the problem nowadays by "red phosphorus" instead of "bromine type" which should be originally, causing migration, etc. We thoroughly manage risks for global procurement.

    * "Silent change" means that the composition of the material will be changed by the material manufacturer etc. of the business partner while the manufacturer does not know.


1, confirmation by acceptance inspection

For all purchased parts (excluding some packing materials), for each lot delivered, according to ANSI / ASQC Standard Z1.4, at the same time as the acceptance inspection, the content inspection of RoHS-specific hazardous substances is carried out in fluorescent X-ray equipment We will.

Therefore, it is possible to detect the changes that can be identified by appearance inspection / endoscopic examination, six substances of RoHS regulation and changes of Cu · P by acceptance inspection.

2. Measures against problems that can not be detected by acceptance inspection

Construction of trust relationship that can be confirmed up to secondary and tertiary manufacturers after primary manufacturer

The place where "silent change" is done is not the place where it is actually delivered, the composition change of the raw material is the main, and we have established a trust relationship that can normally be confirmed with secondary and tertiary manufacturers whose face is difficult to see I will.


1. Flame retardant technique of plastics and trouble caused by flame retardant

NITE (Independent Administrative Institution, Product Evaluation and Technology Infrastructure Organization) disclosed "Flame retardant method of plastics and cases of trouble due to flame retardant" in 2014, but we also focused on the same problem at the same time, DC We have independently investigated flame retardant of PBT resin (polybutylene phthalate) used for insulating sleeve of plug part. At a request from a customer, we visited the site to the secondary maker and the third maker, and confirmed it under the circumstances and tried to prevent the silent change.

Subdivision of description in specification

In order to prevent "silent change", we clearly fill in materials that are prohibited besides regulated substances in the specifications, eliminate ambiguous descriptions, and tell our production consignees. In addition, we are obliged to submit a separate warranty card for parts that can not describe details in the specification sheet.

2. Contamination of red phosphorus

Regarding matters in which red phosphorus is mixed in the flame retardant of plastics resin which we hear frequently in the market in recent years, it is not intentionally mixed with red phosphorus in the material, and even if it contains it, We are submitting it in the form of a "warranty card".

4M thoroughly communicate change

We exchange contracts for 4M change to all manufacturers, and in case we need to change, contact us beforehand to obtain approval. Currently we are dealing with all the makers that we deal with, we have a contract concerning 4M change and we are not conducting trading for any reason if we can not make a contract.

As globalization of procurement progresses, we are promoting further risk management, supply chain management with manufacturers and building relationship of trust.

You can get the product catalog in PDF.

Product initiatives

Since 1989, UNIFIVE has maintained the quality of their AC power adapters and switching power supplies through a rigorous quality,

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