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All Longden doors are manufactured from correctly seasoned hardwood.
The density of timbers varies depending on the species and moisture content. The asterisk indicates that the density can vary more than 20%. For FD60s the density needs to be a minimum of 530kg/m3 excluding Ash and Iroko. Use of Beech is not recommended by Longden.
Moisture content for internal doors and doorsets is recommended to be 10% + - 2% and for external doors and doorsets 16% + - 3%.
| Timber Species |
Density (kg/m3)
|
Suitable for external use
|
Max Fire Rating
|
FSC Availablity |
| Ash American |
670*
|
No
|
FD30
|
|
| Ash European |
710*
|
No
|
FD30
|
|
| Cherry American |
580
|
No
|
FD60
|
|
| Sweet Chestnut |
560
|
No
|
FD60
|
|
| Idigbo |
560*
|
Yes
|
FD60
|
|
| Iroko |
660
|
Yes
|
NR
|
|
| Koto |
560
|
No
|
FD60
|
|
| African Mahogany |
530*
|
Yes
|
FD60
|
|
| Rock Maple |
740
|
No
|
FD60
|
|
| European Oak |
720
|
Yes
|
FD60
|
|
| American White Oak |
770
|
No
|
FD60
|
|
| Sapele |
640
|
Yes
|
FD60
|
|
| Sycamore |
630
|
No
|
FD60
|
|
| Tulipwood |
510
|
No
|
FD30
|
|
| Utile |
660
|
Yes
|
FD60
|
|
| American Black Walnut |
660
|
Yes
|
FD60
|
|
| African Walnut |
560
|
Yes
|
FD60
|
|
| French Walnut |
670
|
Yes
|
FD60
|
|
Key:
* density can vary more than 20%
|
Readily available in FSC
|
|
Available in FSC (Subject to quantity and lead-time)
|
|
Timbers from well managed and sustainable sources |
|
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