PRE-FILLED CASTING EPOXY RESIN COMMPOUND ON ELECTRIC INSULATION FOR
DRY TYPE TRANSFORMERS
THE CLIENT'S PRODUCT:
TDS:
Electrical Insulation Materials
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JT 8869A Epoxy Resin 100 pbw JT 8869B Epoxy Hardener 100 pbw
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| Liquid, Hot-curing cast resin system for outdoor electrical
insulation material for medium and high voltage applications.
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| Dry type transformer and instrument transformer
| Applications
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| Conventional casting with stage wise curing, or pressure gelation
or Processing methods Automatic pressure gelation casting (PG or APG process).
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| Properties Long pot life Excellent mechanical performance Excellent crack resistance
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| Hubei Jiangte Insulation Composite Guangzhou Jiangte Insulation Composite Add:No.219,Zhanghua Rd(N),Economic & Development Add:Rm606,DongHong
International Plaza, No. Zone of Qianjiang City, Hubei Province, China. 113, Chebei Rd,
Tianhe District, Guangzhou,China. Tel:+86-728-6201068 Tel:+86-20-82320316 Fax:+86-728-6202066 Fax:+86-20-82315407 |
JT 8869A Prefilled Liquid and Solvent free Epoxy resin | TYPICAL VALUES* | Viscosity @ 25℃, mPa.s [ ISO 2555:
1989].....................................................................9-16 (tested by Brookfiled instrument)
Density @ 20℃ , g/cm3 [g-Kugel]
...........................................................................1.55-1.22
Filler content,
%(Pbw)...................................................................................................47-52 |
JT 8869B Prefilled Liquid modified and accelerator Epoxy hardener | TYPICAL VALUES* | Viscosity @ 25℃, mPa.s [ISO
2555:19890]....................................................................15-25
Density @ 20℃, g/cm3 ISO2811-2:1997...............................................................1.79-1.86 Filler content, %
Pbw......................................................................................................60-65 |
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Remark JT 8869B contains accelerator. Prolonged storage at high ambient
temperatures results in an undesirable increase in its viscosity
and impairs the reactivity of the Casting Resin system. JT 8869B is sensitive to moisture. Partly emptied containers must
be resealed immediately.
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Storage The components have to be stored under dry conditions at 5 - 25°C,
in tightly sealed original containers. Under these conditions, the shelf life will
correspond to the expiry date stated on the label. After this date, the product may be
processed only following reanalysis. Partly emptied containers should be closed tightly
immediately after use. For information on waste disposal and hazardous products of
decomposition in the event of fire, refer to the Material Safety Data Sheets (MSDS) for
these particular products.
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Process data (guideline values) |
General instructions for preparing liquid resin systems Long pot life is desirable in the processing of any ARALDITE
casting resin system. Mix all of the components together very
thoroughly at room temperature or slightly above and under vacuum.
Intensive wetting of the filler is extremely important. Proper
mixing will result in: • better flow properties and reduced tendency to shrinkage • lower internal stresses and therefore improved mechanical
properties on object • improved partial discharge behavior in high voltage applications. For the mixing of medium- to high viscous Epoxy casting resin
systems and for mixing at lower temperatures, we recommend special
thin film degassing mixers that may produce additional self-heating
of 10-15 K as a result of friction. For low viscous Epoxy casting
resin systems, conventional anchor mixers are usually sufficient.
The prefilled Epoxy resin and Hardener can be stored at elevated
temperature (about 60°C) for up to about 1 week, de-pending on
formulation. Intermittent agitation during storage is advisable to
prevent filler sedimentation.
Mixing time can vary from 0.5 to 3 hours, depending on mixing
temperature, quantity, mixing equipment and the particular
application. The required vacuum is 0.5 to 8 mbar. The vapour
pressure of the individual components should be taken into account. For the viscosity and gel-time data at different temperature, refer
to figure 4.1&4.4
| System Preparation
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Mould temperature Automatic pressure gelatin(APG) process 140-160℃ Conventional vacuum casting 70-100℃
Demoulding time(depends on mould temperature and casting volume)
10-40min Conventional vacuum casting 5-8h
Curing condition APG process(shortest after-curing) 4h at 130℃ or 3h at 140℃ Conventional vacuum casting 12h at 130℃ or 8h at 140℃
It is necessary to test the spicemen to judge its performance, or
to test glass transition temperature. Different gelatin and curing
procedure may result in different cross-link and glass transition
temperature. | |
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Process data (guideline values) |
Process viscosity 
Fig4.1: viscosity increasing at 55℃( tested by Brookfiled)
Gelatin/Curing time
Fig4.4: gel-time changes as per temperature
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| Mechanical and Physical Properties (guideline value) |
Determined on standard specimen at 23°C Cured for: 6h at 80°C + 4h at 100°C+6h 130°C
| TYPICAL VALUES* | Glass transition temperature (ISO 11357-2:1999), ℃
...............................................65-75
Tensile Property, [ISO R 527] Tensile strength, at 23℃,
MPa..................................................................................68-78 Elongation at break, %
..............................................................................................1.8-2.0 E modulus from tensile test, MPa
.....................................................................8000-9000
Flexural Property, [ISO 178:2001] Flexural strength, at 23℃,
MPa.............................................................................110-125 Elongation, %
............................................................................................................
1.5-1.7 E modulus from flexural test, MPa
...............................................................
....8,000-9,500
Fractural toughness test, [PM216-1989] Critical stress intensity factor, K1C (MPa.m1/2) ......................................................2.0 - 2.4
CTE, TMA, ppm/K ………………………………………………………………………………………...……………40-43
Water absorption (10 days @23℃), %, [ISO 62]
...................................................0.15–0.20
Density @ 20℃, g/cm2, [DIN 55990]
………………........................................................1.65-1.85 |
Electrical Properties (guideline values) Breakdown strength IEC60243-1, 50HZ KV/mm 22-25 
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Industrial hygiene
When operating and processing products, must follow the industrial
hygiene standards.
For more information, please refer to the corresponding safety data
sheet and .
Operating protection measures
Workplace safety measures:
Protective clothing Need
Gloves Must need
Arms to protection May contact with the skin, Recommended
Goggles/safety glasses Need
Mask/dust mask Recommended
Skin protection:
Before working To exposed skin protection by cream
After washing Frost of besmear protective cream or nutrition
Contamination of the skin clean With suction paper wipe, wash with
warm water and alkali free soap, With a one-time towel dry. Do not
use solvents.
Clean workshop environment Use a light paper covering the table and
chairs. Using a
disposable beaker, etc. Spatter material processing Use sawdust or
waste cotton silk blotting, and placed in a plastic woven baskets.
Ventilation:
To workshop Take a breath three to five times per hour.
To position Cover of exhaust fan. The operator should avoid
inhalation of vapour.
First aid
When the eyes by resin and curing agent and the contamination of
castable, immediately with a clean, running water rinse 10 to 15
minutes. To see a doctor. Touch or splash on the skin material to
erase, and then clean with water pollution areas (see above). If
severe pain or burn, want to see a doctor. Dirty clothes to
replaced immediately.
Discomfort caused by inhalation of vapors, want instantly remove
outdoor. If in doubt, please inquire the medical help.
Last revised:2016-01
