Rich,
A wording is proposed by UK in the consultation for British transposition of
RoHS :
[The definitions and interpretations given in the following six paragraphs
are taken from the guidance developed by the European Commission and agreed
by the TAC. It is dependent on the ratification of the Commission's draft
Decision establishing the maximum concentration values outlined above.]
27. 'Homogeneous material' means a material that cannot be mechanically
disjointed into different materials.
28. The term 'homogeneous' is understood as "of uniform composition
throughout", so examples of "homogeneous materials" would be individual
types of plastics, ceramics, glass, metals, alloys, paper, board, resins and
coatings.
29. The term "mechanically disjointed" means that the materials can be, in
principle, separated by mechanical actions such as unscrewing, cutting,
crushing, grinding and abrasive processes.
30. Using these interpretations, a plastic cover (for example) would be a
'homogeneous material' if it consisted exclusively of one type of plastic
that was not coated with or had attached to it (or inside it) any other
kinds of materials. In this case, the maximum concentration values of the
RoHS Regulations would apply to the plastic.
31. On the other hand, an electric cable that consisted of metal wires
surrounded by non-metallic insulation materials would be an example of
something that is not
'homogeneous material' because mechanical processes could separate the
different materials. In this case the maximum concentration values of the
RoHS Regulations would apply to each of the separated materials
individually.
32. A semi-conductor package (as a final example) would contain many
homogeneous materials, which include the plastic moulding material, the tin
electroplating coatings on the lead frame, the lead frame alloy and the
goldbonding wires.
Pascal Guihéneuf
Nortel Networks Wireless
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]]
Sent: vendredi 6 août 2004 00:51
To: [log in to unmask]
Subject: [LF] Homogenous?
I've read July 20th "un-official note" concerning the long awaited
stakeholders guidance directive from the EU's TAC. In regards to the MCV
"homogenous" issue on page 3, am I the only one confused with what the note
states as to this item?
Seems to say they like what came out of a July 16th workshop, and will
consider adding the new wording to a future revision, but no clue as to what
that wording is or when this revision will take place.
Rich Kraszewski
Advanced Manufacturing Engineer - KEDS
Phone: 260.925.8919
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