Due to restrictions we are no longer able to send this product off the UK mainland including BT post codes.

Brocott UK, Specialist Enamelled Copper Wires and Insulations and Varnishes

1000ml Tin - Vacuum Impregnating Varnish (VPI Varnish)

Applications
A quality general purpose varnish for impregnation enamelled copper wire coils of transformers, chokes, relays and fields, together with most types of electric motors
which can be used with Vacuum/Pressure systems, Cold Dip or Hot Dip. A major benefit being a low cure temperature and a short cure time.

General description
Quick cure polyester imregnating varnish is a high flash, modified isophthalic alkyd, which produces tough resilient insulating films
with good bond strengths at all operating temperatures up to Class H (180C). The varnish gives excellent penetration into windings with
clean drainage and low secondary drainage properties, which together with its quick curing characteristics and the ability to cure at
lower temperatures, allow operators maximum versatility in processing. The cured product meets BS 5629 and DEF 31a specifications,
gives exceptionally good resistance to moisture and insulating oils, together with the certainty a full cure in the deeper sections of windings.
Good flexibility is shown around fly leads, and compatibility with all normal insulating systems is achieved.

Specification
VISCOSITY ~~~ 110 - 130 secs BS 3900 pt A6 B4 flow cup at 25C
NON VOLATILE CONTENT ~~~ 48 - 52%
SPECIFIC GRAVITY ~~~ 0.98 - 1.00
FLASHPOINT ~~~ 43C
SHELF LIFE ~~~ 18 months at 20C

Cure Schedule
TIME (hours) ~~~ 1hr at 150C // 2hr at 140C // 3hr at 130C // 4hr at 120C

Properties of cured varnish
BOND STRENGTH 20C 135 lbs (61.4 kgs)
155C 22 lbs (10.0 kgs)
BREAKDOWN VOLTAGE 20C 2350 v/mil
90C 1810 v/mil
24 hr immersion
in sea water 1350 v/mil
FLEXIBILITY Pass 5mm (3/16") mandrel