Sash Cord
The Draftfix range of UK manufactured Waxed Cotton Sash Cord includes a Polypropylene core to reduce flexing. Please view the below table for the relevant working and breaking strains. Please note our working tolerance has a safety factor built in to take into account the extra stress that can occur in vary rare occasions when a Sash Weight snags.
| Size | Breaking Strain | Working Tolerance |
| 4mm | 210kg | - |
| 5mm | 310kg | 51kg |
| 6mm | 340kg | 56kg |
| 7mm | 360kg | 60kg |
| 8mm | 390kg | 65kg |
| 8mm HD | 1450kg | 200kg |
| Elongation % | 30kg | 40kg | 50kg | 75kg | 100kg |
| 4mm | 1% | 2.5% | 4% | 5% | |
| 5mm | 0 | 1% | 2% | 3% | 5% |
| 6mm | 0 | 1% | 2% | 2.5% | 4% |
| 7mm | 0 | 1% | 2% | 2% | 3.5% |
| 8mm | 0 | 1% | 1.5% | 2% | 3.5% |
| 8mm HD | 0 | 0 | 0 | 0 | 1% |