|
|------------------------------------------------------------------------------------------|
| | Cylinder conditions | Strength |
| |---------------------------------+--------------------------------------------|
| | Steaming | Static | Impact | |
| |---------------------------------+---------------------+----------| Average |
| Treatment | | | | Bending | Compres- | Height | of the |
| | | | | modulus | sion | of drop | three |
| | Period | Pressure | Temperature | of | parallel | causing | strengths |
| | | | | rupture | to grain | complete | |
| | | | | | | failure | |
|-----------+--------+----------+-------------+----------+----------+----------+-----------|
| | | Lbs. per | | Per cent | Per cent | Per cent | Per cent |
| | Hrs. | sq. inch | deg.F. | | | | |
| | | | | Untreated wood = 100% |
| | | | | | | | |
| Steam, | 4 | | 230[a] | 91.3 | 79.1 | 96.4 | 88.9 |
| at | 4 | 10 | 238 | 78.2 | 93.7 | 93.3 | 88.4 |
| various | 4 | 20 | 253 | 83.3 | 84.2 | 91.4 | 80.8 |
| pressures | 4 | 30 | 269 | 80.4 | 78.4 | 89.8 | 82.9 |
| | 4 | 40 | 283 | 78.1 | 74.4 | 74.0 | 75.5 |
| | 4 | 50 | 292 | 75.8 | 71.5 | 63.9 | 70.4 |
| | 4 | 100 | 337 | 41.4 | 65.0 | 55.2 | 53.9 |
|-----------+--------+----------+-------------+----------+----------+----------+-----------|
| Steam, | 1 | 20 | 257 | 100.6 | 98.6 | 86.7 | 95.3 |
| for | 2 | 20 | 267 | 88.4 | 93.0 | 107.0 | 96.1 |
| various | 3 | 20 | 260 | 90.0 | 93.6 | 84.1 | 89.2 |
| periods | 4