Document NE8vpXYJ5eQR9vwqEmNKMB67y
GENERAL
ELECTRIC'
IAL COMM*. 8*236-4391
DATE
Pittsfield, July 12, 1979
dept. LTBD Technical Resources Operation
a d d r e s s. Building 11 - Room 337
PtE.3*0. Rouse R. C. Osthoff R. P. Anderson J. M. McQuade
11-337 11-222 11-315 11-337
Mr. G. N. Bull Dept. E&ESD General Electric Co.
Schenectady, N.Y.
Dear George:
I've tried to put together a reasonably accurate chronology of Pyranol Composition. The dates are close, I believe, but you should recognize that during the transition period the composition would vary continuously as the switchover was made.
Pyranol was first introduced in G-E transformers in 1932. These transformers were made in Pittsfield. The first transformers with Pyranol made in Rome were produced in 1953. The accompanying tables summarizes the chronology of the changes in Pyranol composition.
f r i r r l i a l 1 */
W. A. Fessier Sr. Insulation Chemist Dielectric Materials Laboratory
:mg
GENP 009608
773220
ROME PRODUCTION
Time Period Pyranol Designation
Composition
1953-1963
1470
452 hexachlorobiphenyl (Aroclor 1260)
402 trichlorobenzene 152 tetrachlorobenzene 0.252 tetraphenyl tin
1963-1965
A13B3B
(also 1965-1970)
452 hexachlorobiphenyl (Aroclor 1260) 402 trichlorobenzene 152 tetrachlorobenzene 0.1252 diepoxide (4221)
1965-1970
A50P524
802 trichlorobiphenyl (Aroclor 1242) 132 trichlorobenzene
72 tetrachlorobenzene 0.1252 diepoxide (4221)
1970-1972 (also 1973-74)
A50P559
652 pentachlorobiphenyl (Aroclor 1254)
232 trichlorobenzene 122 tetrachlorobenzene 0.1252 diepoxide (4221)
1972-1974
A13B3B-2
452 pentachlorobiphenyl (Aroclor 1254) 402 trichlorobenzene
152 tetrachlorobenzene 0.1252 diepoxide (4221)
1974-end
A50P570
402 pentachlorobiphenyl (Aroclor 1254) 602 trichlorobenzene 0.1252 diepoxide (4221)
GEN P 009609
773221
Time Period 1932-1944 1944-1952 1952-1963
1963-1970
1970-1974
1974-end
PITTSFIELD PRODUCTION
Pyranol Designation
Composition
1488
602 hexachlorobiphenyl (Aroclor 1260) 402 trichorobenzene
1467
602 hexachlorobiphenyl (Arochlor 1260) 402 trichlorobenzene 0,1252 tetraphenyl tin
1470
452 hexachlorobiphenyl (Aroclor 1260) 402 trichlorobenzene 152 tetrachlorobenzene
0,1252 tetraphenyl tin
1497 or A13B3B
452 hexachlorobiphenyl (Aroclor 1260) 402 trichlorobenzene 152 tetrachlorobenzene 0.1252 diepoxide (4221)
A13B3B2
452 pentadorobiphepyl (Aroclor 1254) 402 trichlorobenzene 152 tetrachlorobenzene 0.1252 diepoxide (4221)
A13B3B3
602 pentachlorobiphenyl (Aroclor 1254)
402 trichlorobenzene 0.1252 diepoxide (4221)
0f9600riNi3r>
773222
