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2440 Polyester Silicon Glass Varnish Cloth

It is made from electrical alkali-free glass fiber cloth impregnated with oil-modified polyester varnish, it has strong heat resistance, dielectric properties, oil resistance is stronger than 2210 polyester glass cloth, used for liner insulation for transformers, motors and wrap insulation, class is F . it is stable at 155 degrees.for a long time.

  1. Thickness: 0.11,0.12,0.13,0.15,0.17,0.18,0.20,0.25,0.38mm;
  2. Width: Not less than 1200-1270mm. According to user needs, glass cloth can be cut straightly and obliquely (generally along the 45 ℃ angle), the width of bands are 15,20,25mm and others. Tolerance of width less than100mm is ± 0.5mm; Tolerance of width more than 100mm is 1% of the width.

Polyester silicon glass varnish cloth technical characteristics

 Property Nominal thickness and tolerance
0.10±0.010 0.12±0.012 0.15±0.015 0.18±0.018 0.20±0.020 0.25±0.025
Hydrolysis resistance After 24h on 105±2℃,  the varnish film will not be destroyed
Influence of glass varnished cloth on oil After 72h in 45  transformer oil on 105±2℃, the acid value is not more than 10mg KOH/g
Influence of oil on glass varnished cloth After 48h in 45  transformer oil on 105±2℃, the varnish film will not be destroyed

Tensile Strength
N/10mm

Lengthwise ≥70 ≥90 ≥100 ≥105 ≥110 ≥120
Crosswise ≥40 ≥50 ≥60 ≥65 ≥70 ≥80
45°向 45° Direction ≥40 ≥60 ≥65 ≥65 ≥70 ≥80
Oblique  cutting
lap joint
Before Varnishing ≥20 ≥25 ≥30 ≥30 ≥35 ≥35
After
Varnishing
≥20 ≥20 ≥20 ≥30 ≥30 ≥30
Extend 10% along 45° direction 2~12 2~12 3~15 3~15 4~16 5~20
Elongation
rate at breaking%
Lengthwise ≥1.5 ≥1.5 ≥2.0 ≥2.0 ≥2.5 ≥3.0
45° direction ≥15 ≥15 ≥15 ≥18 ≥20 ≥20
Edge tearing strength (N) Lengthwise ≥5 ≥6 ≥7.5 ≥10 ≥20 ≥25
45° direction ≥50 ≥60 ≥75 ≥80 ≥90 ≥120
Breakdown voltage (KV) 23±2℃ ≥5.0 ≥6.0 ≥7.0 ≥7.0 ≥8.0 ≥9.0
155±2℃ ≥2.5 ≥3.0 ≥3.5 ≥3.8 ≥4.0 ≥4.5
Elongate 6%  on 45° direction ≥3.0 ≥3.0 ≥3.5 ≥4.0 ≥4.0 ≥4.5
After humidity on 23±2℃ ≥2.5 ≥3.0 ≥3.5 ≥3.5 ≥4.0 ≥4.5
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