| Type | Window Envelopes |
| Brand | Unbranded |
| Colour | White |
| Size | C4 |
| Material | Paper |
| Eco-Aware | Yes |
| Closure | Self Seal |
| Grammage | 90gsm |
| Grade | Medium Weight |
| Dimensions | 324x229mm |
| Environment Support | 100% Biodegradable and Nordic Swan Certified |
| Envelope Grade | Medium Weight |
| Gusset | No Gusset |
| Biodegradable Information | 95 |
| Country of Origin | United Kingdom |
| Depth (mm) | 145 |
| Height (mm) | 145 |
| OEM | WX3501 |
| Recyclable Percentage | 100 |
| Width (mm) | 240 |
| ISO 14001 (Y/N) | Yes |
| Recyclable (Yes/No) | Yes |
| Biodegradable | Yes |
| Contains timber or derived materials | Yes |
| Mill Name | Upm – Kymmene Corporation |
| Species of Tree | Aspen/Birch/Pine/Spruce 71% Hardwood/29% Softwood |
| Item Gauge (gsm) | 90 |
| Closure Method | Self Seal |
| Envelope Closure | Self Seal |
| Envelope Size | C4 |
| Envelope Type | Window |
| Envelope Weight (gsm) | 90 |
| Plain/Window | Window |
| Accreditation | Blue Angel/Nordic Swan |
| Envelope Window Depth | 40 |
| Envelope Window Position In | 24 |
| Envelope Window Position Up | 213 |
| Envelope Window Width | 105 |
| Blue Angel (Y/N) | Yes |
| Nordic Swan (Y/N) | Yes |
| Minimum Recyclable Content (%) | 100 |
| PEFC | Yes |