Certified for Excellence.
Compare All Grades
| Grade | Grade Code | IEC Standard | Thickness Range |
|---|---|---|---|
| HD Grade | UB-HD-3.1 | IEC 60641-3-1 Type B 3.1A | 0.8 mm to 6.4 mm |
| DT Grade | UB-DT-3.1 | IEC 60641-3-1 Type B 3.1B | 1.0 mm to 3.0 mm |
| Laminated | UB-HD-3.1 Laminated | IEC 60763-3-1 Type LB 3.1A | 7.0 mm to 120.0 mm |
| Calendered | UB-LD-2.1 | IEC 60641-3-1 Type B 2.1A | 1.0 mm to 6.0 mm |
| PSP 3050 | UB 3050 | IEC 60641-3-1 Type B 2.1B | 1 mm to 3 mm |
| Mouldable | UB-M-4.1 | IEC 60641-3-1 Type B 4.1 | 1.5 mm to 3.0 mm |
Click any row to explore that grade in detail below.
High Density Pressboard — HD Grade
The most widely specified grade for transformer barriers, rings, and cylindrical spacers — combining the highest mechanical strength with precise dimensional control from 0.8 to 6.4 mm.
| Type / Grade | Thickness | Length (mm) | Width (mm) |
|---|---|---|---|
| UB-HD-3.1 | 0.8 mm to 6.4 mm | 4000 | 2100 |
| 3200 | 2100 | ||
| 2200 | 1100 | ||
| 2000 | 1050 |
High Density Pressboard — DT Grade
A DT-class high-density board for thinner cross-sections — delivers the mechanical integrity of HD Grade in reduced thickness profiles from 1.0 to 3.0 mm.
| Type / Grade | Thickness | Length (mm) | Width (mm) |
|---|---|---|---|
| UB-DT-3.1 | 1.0 mm to 3.0 mm | 2000 | 1050 |
| 2200 | 1100 |
Laminated Pressboards
Multiple pressboard layers bonded under controlled pressure — Casein glue for standard structural applications up to 120 mm, Polyester glue for heavy-duty components up to 200 mm.
| Type / Grade | Thickness | Length (mm) | Width (mm) |
|---|---|---|---|
| Casein Glue — LB 3.1A.1 | 7.0 mm to 120.0 mm | 2000 | 1000 |
| 2100 | 1050 | ||
| Polyester Glue — LB 3.1A.2 | 7.0 mm to 200.0 mm | 3000 | 2000 |
| 3100 | 2100 |
Calendered Pressboards
Smooth-surface board with good pliability — the standard choice for barriers and spacers in distribution transformers where surface finish and ease of processing matter.
| Type / Grade | Thickness | Length (mm) | Width (mm) |
|---|---|---|---|
| UB-LD-2.1 | 1.0 mm to 6.0 mm | 2000 | 1000 |
| 3000 | 2000 |
PSP 3050 Pressboard
Press-drying compatible calendered board with enhanced oil absorption — delivers consistent density and dimensional stability through transformer assembly processes.
| Type / Grade | Thickness | Length (mm) | Width (mm) |
|---|---|---|---|
| UB 3050 | 1 mm to 3 mm | 2000 | 1000 |
| 2200 | 1100 |
Mouldable Pressboard
Formable under heat and pressure into complex three-dimensional profiles — used where flat sheets cannot serve, including end collars, rings, and custom insulation barriers.
| Type / Grade | Thickness | Length (mm) | Width (mm) |
|---|---|---|---|
| UB-M-4.1 | 1.5 mm to 3.0 mm | 2000 | 1000 |
Request a Technical Sheet
Share your application requirements and our engineering team will provide the relevant grade datasheet, dimensional tolerances, and pricing guidance.