| Customization: | Available |
|---|---|
| Application: | Insulators |
| Color: | Brown |
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1. Summary
Electrical insulating laminated wood is widely used as insulation and supporting materials in transformers and instrument transformers.
2. Veneer Face Flatness(unit mm)
|
Normal Thickness |
Distance of any point on the upper surface of the veneer that deviates from the light weight straight ruler |
|
|
Veneer length 500 |
Veneer length 1000 |
|
|
≤15 |
2.0 |
4.0 |
|
>15..≤25 |
1.5 |
3.0 |
|
>25..≤60 |
1.0 |
2.0 |
|
>60 |
1.0 |
1.5 |
3. Appearance Quality
|
Item |
Allowed Range |
|
Swelling |
Not Allowed |
|
Cracking |
|
|
Dead Knot |
|
|
Foreign-body Adhering |
|
|
Insect Hole |
|
|
Rot |
|
|
Contamination |
|
|
Bruising |
A few allowed, not effect in usage |
|
Impression |
|
|
Color-odds and splash |
|
|
Patches per sq.m on surface |
≤3 |
4.GB Test Item--- Before delivery Factory inspection
|
Test Item |
Unit |
Standard |
Test Method |
|
|
Vertical Bending Strength |
Toward A |
Mpa |
≥65 |
GB/T2634-2008 Test Standard |
|
Toward B |
≥65 |
|||
|
Vertical Bending modulus of elasticity |
Toward A |
Gpa |
≥8 |
|
|
Toward B |
≥8 |
|||
|
Compressibility (under 20MPa) |
Toward C |
% |
≤3 |
|
|
Crev |
≥70 |
|||
|
Impact strength (side test) |
Toward A |
KJ/M |
≥13 |
|
|
Toward B |
≥13 |
|||
|
Interlaminar shear strength |
Mpa |
≥8 |
||
|
Vertical electric strength (90 ºC + 2 ºC) |
KV/mm |
≥11 |
||
|
Vertical electric strength (90 ºC + 2 ºC) |
KV |
≥50 |
||
|
Performance density |
g/cm³ |
>1.1~1.2 |
||
|
water content |
% |
≤6 |
||
|
Shrinkage after drying |
Toward A |
% |
≤0.3 |
|
|
Toward B |
≤0.3 |
|||
|
Toward thickness |
≤3 |
|||
|
Oil absorption |
% |
≥8 |
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