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RoHS-Related Analysis Service

Addressing environmental problems, the European nations are monitoring the small amounts of hazardous substances, such as cadmium and lead contained in electrical and electronic products. If, by regulation, these quantities exceed permitted limits, shipping of products is supposed to be difficult. As a one-stop solution, OKI Engineering offers component and material evaluation services for existing products and those in development, including incoming inspection.

RoHS Analysis Service

  • NOTES:
    RoHS: Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment (2002/95/EC)
    WEEE: Waste Electrical and Electronic Equipment (2002/95/EC)
    ELV: End-of-life Vehicles (2002/95/EC)

Analysis of Harzardous Substances in Materials and Products

Substances under Regulation

As in the table below, the RoHS directive lists six substances, cadmium, lead, hexavalent chromium, mercury, polybrominated diphenyl ether (PBDE) and polybrominated biphenyl (PBB), to all of which we respond promptly.

Restricted Substances Abbreviation Maximum Concentration Major Purpose
Cadmium Cd 0.01wt% (100ppm) plastic mold impurity
Lead Pb 0.1wt% (1000ppm) solder, alloys
Hexavalent chromium Cr6+ 0.1wt% (1000ppm) platings
Mercury Hg 0.1wt% (1000ppm) fluorescent lighting
Polybrominated diphenyl ether PBDE 0.1wt% (1000ppm) flame retardants
Polybrominated biphenyl PBB 0.1wt% (1000ppm) flame retardants

Examples of Actual Performance

  • IC packages
  • mold resin materials
  • seal inks
  • printboards
  • glass epoxy boards
  • wire rod vinyl coatings
  • stainless
  • casing and packing materials
  • plastic moldings
  • chrome plated screws
  • resin palettes
  • silver pastes
  • coating compounds
  • inks
  • aluminum alloys

Analysis Methodologies

Analysis Sample Analysis Methodologies
Cadmium, lead, chromes, mercury 1. Preprocessing by high temperature/pressure analysis with microwave analyzer.
2. Quantative analysis with high-frequency argon plasma emission spectrometer (ICP-AES) and high-frequency argon plasma mass analyzer.
Hexavalent chromium 1. Preprocessing by ultrasonic extraction of samplee immersed in warm water or customer specified preprocessing methodology.
2. Quantative analysis by diphenylcarbazide absorption photometry using a spectrophotometer.
Bromine fire retardant 1. Preprocessing by extraction of organic solvants.
2. Analysis with gas chromatograph mass analyzer.
Abbreviated analyses 1. Simplified analysis with fluorescent X-ray.
2. Analysis of lead, cadmium, chrome, mercury and bromine.
3. Hexavalent chromium is evaluated as chrome and bromine series flame retardants as bromine.

Introduction to Mapping Analysis for Hazardous Substances in Products

Essential Features

Conventionally, during analysis of numerous assembled products for hazardous substances in accordance with the RoHS directive the initial diagnosis used to be "soldered parts may be treated as homogenous materials", but when it gets problematic checking a printboard uniformly in fragments whilst harmful substances are present in excess, then it is common to check contents of hazardous substances on each and every part.

Transmission X-ray element mapping analysis enables visualization of the distribution of a printboard's constituent elements by capturing image data for inspections. This allows lot management of individually verified products, spot checks, etc. In addition, thresholds can be satisfied by spot analysis of arbitrary locations.

Test Equipment Specification

Fluorescent X-ray mapping analyzer, Horiba XGT-5000 Type S
Probing range 200mm x 200mm
Analysis area 10μm or 1.2mm
Max. sample size 500mm x 350mm x 85mm

Analysis Case Example

It is as well possible to further analyze confirmed products individually. By this means the presence of eutectic solder on lead-free printboards can be determined thanks to our image data analysis.

Comparison mapping analysis example of a completely mounted printboard showing in sequence the overall board image, transmission X-ray image, and images in the spectra of 28 Ni Ka, 29 Cu Ka, 50 Sn La1, 35 BrKr, 82 Pb La1 and R:Sn G:Pb.

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