| Type | Window Envelopes |
| Manufacturer | Blake Envelopes |
| Brand | Purely Environmental |
| Biodegradable | Yes |
| Country of Origin | Slovakia |
| Depth (mm) | 384 |
| Grade | Medium Weight |
| Height (mm) | 384 |
| Hexavalent Chromium (ppm) | No |
| Mercury (ppm) | No |
| Minimum Recycled Content (%) | 100 |
| OEM | RD7892 |
| Pre or Post Consumer? | Pre Consumer |
| Recyclable (Yes/No) | Yes |
| Recyclable Percentage | 70 |
| Recycled Product | Yes |
| Width (mm) | 240 |
| ISO 14001 (Y/N) | Yes |
| Green Product | Yes |
| Material | Paper |
| Closure | Self Seal |
| Eco-Aware | Yes |
| Biodegradable Information | 70 |
| Contains timber or derived materials | Yes |
| Mill Name | Blake |
| Species of Tree | Picea Abies/Pinus Sylvestris |
| SMETA Registrated (Y/N) | Yes |
| Grammage | 100gsm |
| Country of Harvest | Slovakia |
| Item Gauge (gsm) | 100 |
| Proof of Legality Obtained | Yes |
| Recycled % | 100 |
| Pre Consumer Recycled Content | 100 |
| Dimensions | 324x229mm |
| Environment Support | Biodegradable |
| Gusset | No Gusset |
| Closure Method | Self Seal |
| Envelope Closure | Self Seal |
| Envelope Size | C4 |
| Envelope Type | Window |
| Envelope Weight (gsm) | 100.00 |
| Plain/Window | Window |
| FSC (Y/N) | Yes |
| Contains Recycled Material | Yes |
| Envelope Grade | Medium Weight |
| Window Position | 213mm Up 24mm From Left |
| Window Size | 40x105mm |
| Flap Position | Short Edge |
| Envelope Window Depth | 40 |
| Envelope Window Position | B 40 x 105mm - 24mm in 213mm up |
| Envelope Window Position In | 24 |
| Envelope Window Position Up | 213 |
| Envelope Window Width | 105 |
| Envelope Colour | White |
| 2023 UK catalogue page no | 320 |