AC/DC Power Adapter, and what measures are taken to prevent silent changes to the components used?

We explain our measures against so-called silent changes. UNIFIVE thoroughly implements risk management for global procurement.

In recent years, with the globalization of procurement, risks caused by "Silent Change" have become apparent, particularly among major electronics manufacturers. There have been incidents in which the resin material used in DC plug components was replaced from the originally specified "bromine-based" material to "red phosphorus," causing migration and resulting in heat generation problems. In response, we have thoroughly implemented risk management for global procurement.

• * "Silent Change" refers to a situation in which the composition of materials is altered by a supplier, such as a material manufacturer, without the knowledge of the manufacturer.

Countermeasures

1, Verification through incoming inspection

For all purchased components (excluding some packaging materials), we conduct incoming inspections for each delivery lot in accordance with ANSI/ASQC Standard Z1.4, and at the same time perform content analysis of RoHS-specified hazardous substances using X-ray fluorescence equipment.

Accordingly, changes identifiable through visual inspection or endoscopic inspection, as well as changes in the six RoHS-regulated substances and Cu and P, can be detected during incoming inspection.

2, Measures for issues that cannot be detected by incoming inspection

Building trustworthy relationships that enable confirmation with secondary and tertiary manufacturers beyond primary manufacturers

"Silent Change" does not typically occur at the point of actual delivery, but mainly involves changes in raw material composition. Therefore, we build trustworthy relationships that allow us to routinely confirm conditions with secondary and tertiary manufacturers, whose operations are often less visible.

Case Examples

1. Flame-retardant methods for plastics and trouble cases caused by flame retardants

In 2014, NITE (National Institute of Technology and Evaluation) published "Flame-retardant Methods for Plastics and Trouble Cases Caused by Flame Retardants." At the same time, we focused on similar issues and independently investigated the flame retardants used in the PBT resin (polybutylene terephthalate) for the insulating sleeve of DC plug components. At the request of a customer, we visited secondary and tertiary manufacturers to verify on-site conditions and worked to prevent silent changes.

Further specification details in documentation

To prevent "Silent Change," we clearly specify not only regulated substances but also prohibited materials in our specifications, eliminating ambiguity and ensuring clear communication to our production subcontractors. In addition, for items that cannot be fully detailed in the specifications, we require the submission of separate written guarantees.

2. Contamination of red phosphorus

Regarding the recent frequent issue in the market of red phosphorus being mixed into flame retardants for plastic resins, each manufacturer is required to submit a "guarantee" confirming that red phosphorus has not been intentionally added to the materials and that, even if present, the content is 100 ppm or less.

Thorough notification of 4M changes

We execute agreements with all manufacturers regarding 4M changes, requiring prior notification and approval when changes are necessary. We have concluded 4M change agreements with all manufacturers we currently do business with, and we do not conduct transactions for any reason if such an agreement cannot be established.

As procurement continues to globalize, we are further strengthening risk management, supply chain management with manufacturers, and the development of trusted relationships.