COORDINATING COMMITTEE MEMORANDUM BY THE GERMAN DELEGATION ON A PROPOSAL TO REDEFINE ITEM 1562

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP62-00647A000100110008-2
• Release Decision: RIFPUB
• Original Classification: C
• Document Page Count: 3
• Document Creation Date: November 9, 2016
• Document Release Date: April 15, 1999
• Sequence Number: 8
• Publication Date: May 13, 1959
• Content Type: MEMO

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CBRMAN DELEGATION 00COM DOC. 3415.62/1
Paris, 13th Mai,'1959
COORDINATING CO11MITTEE
.:Q- ORA dDUM BY THE GERMAN DELEGATION
ON A PROPOSAL TO REDEFINE ITEM 1562
51,
With reference to Cocom Document 3520 by which an
"accident of definition" exception-ease has been submitted
and in accordance with Cocom Document 1473, Annex C, the
German Delegation pr--.pose to redefine item 1562 as follows :
"Tantalum electrolytic capacitor's, n.e.s., as fellows :
a) all types designed to operate at'temperatures
exceeding 85' C
b) solid sintered electrolyt capacitors
Reasoning :
m.e.s.
covers four types of capacitors completely different in
their construction, namely
The present c e,fLiition "Tantalum electrr.lytic ' capacitors,
1)those constructed with foils
2) the Wnedel-type
3) Sinter-capacitors (wet)
4) (dry')
Ad 1 The construction cf the tantalum - foil capacitor is
equal tc. the normal electrolytic - capacitor (winding
'type). However, by using tantalum instead of aluminium
0
an exterisicfl of the temperature-range from -60 to
+60` C (+85 C for sh')rt periods) is obtained, while
alumi:iiuin-electrolyt e-capacitors cover only tempera-
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tures of -20? C to +70? C.
In the field of missile-technique and military telecommu-
nication, a special design 'of tantalum-foil-capacitors
with high service-temperatures of 125?C and more has
been developed, This special design of capacitors could
be kept under embargo 1y introducing a cutoff of +850C
which would set free the commercial types. Capacitors
with a'temperature-range below +85o C do in the opinion
of German experts, not meet the requirements of a military
.usage.
Moreover, as this type has rather treat dimensions,
in general only stationary apparatus are equipped with
them.
Ad 2:In the 'endel-type capacitor, the anode is constructed
in a spiral made of tantalum. By this construction, only
relatively low capacities are possible. The temperature-
ran e extends fr;,m C to +501C (+60?C for short
periods) . On account of its comparatively inferior ap-
parent - resistance - performance, the Wendel-type is
mainly used for tone-frequencies, especially in hearing
aids. Its other characteristics -normal temperature
limits, comparatively short service - lifetime, and es-
_,pecially its perfc'rmance,'of limited reliabilty make
the Wendel-type suitable :only for a few special purposes
in the civilian sect--r, while in the opinion of German
experts, it cannot be used at all for military purposes.
Ad 3 and4 .
C,--~ntrary to the foil-and-Wendel-capacitors, the sinter-
capacitors have a sinter-anode instead of one out of
solid metal. Thereby, the electrolyt can be a wet or a
.dry'element,, The construction of the sinter-capacitor makes
it p-.s,,>ible to have high capacities despite of very small
dimensions of the apparatus. However, the wet'-sinter-type
has some,unfavourable characteristics in its electrical
performance which limit its use considerably. It is,
3 -
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theref"re, very unlikely that this type will be in-
stalled in military equipment, e.g. in missiles, mobile
In conclusion, it may be stated that the advantages of
ter has a lar-er temperature-range which extends u
+85?C, and - sometimes- down t, -80o C.
tor maintains its capacity at 1007o. moreover, the
equipment etc.
The.sinter-capacitor with dry electrolyt can, indeed,
be considered as the latest technical development in
'this field. At a frequency of 20 megacycles and a tempe-
rature of +2Q? C, the apparent-capacity of a wet sinter-
capacitor drops to 7 or 8 %, while a dry sinter-capaci-
tantalum-capacitors, if compared to the normal capacitors,
are to be found mainly in a larger temperature range.
nevertheless, the first three types described above do,
in the cpini?n of German expertsy no longer deserve an
embargo - as far as their service tempera-ure does not
exceed +8500 - as they are of no military or strategic
interest because ,~f their size, construction or inferior
electrical characteristics. Moreover, there is n(, danger
of giving away any technological kncw-how when supplying
normal types of the capacitors described under No, It
2 .and 3 above, as such instruments cannot he easily
copied, and their production stipulates a permanent and
dated 30 June 1558, submitted by the i~c,therlands Dele-
gation during the last list review, in which also the
opinion is voiced to leave the wet=tantalum-electroly-
tic-capacitors free from embargo while covering the-
dry types.
The German Delegation'would appreciate to hear the
views of Governments on the above redefintion proposal
at an early date.
thorough laboratory-control-
In this connection, reference is made to W.P. 54r
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