Douglas fir sawdust

At all events, however, it will be reasonable, in practice, to consider a temperature 20 K lower than the value of Tc calculated herein for a sawdust heap, formed into the infinite slab above referred to and placed in the atmosphere under isothermal conditions, as the upper limit temperature for the safe handling of the sawdust. For instance, 100 °C will be the upper limit temperature for the safe handling of the sawdust of zelkova, 105 °C for that of Western red cedar, 110 °C for that of Douglas fir, and so forth. 

Now, if the sawdust of mixed hardwood is assumed to be in fact the sawdust of Western red cedar, the Tc for a sawdust heap of mixed hardwood, formed into a sphere, 82 cm in diameter, and placed in the atmosphere under isothermal conditions, which is cited in Table 21, is calculated at 134.8 °C, because the values of the variables, a, b, r, and apart from the constant, A T, in Eq. (79), are fixed for the sphere at 12574.6, -25.1238, 41, 0.16 and 3.32, respectively. The value of 7). thus calculated is in fair agreement with the value of 135 °C measured actually by Anthony et al. for the sphere [68]. Similarly, if the sawdust of Kiefemholz (German pine) is assumed to be in fact the sawdust of Douglas fir, the for a sawdust heap of Kiefemholz, formed into a sphere, 100 cm in diameter, and placed in the atmosphere under isothermal conditions, which is also cited in Table 21, is calculated at 131.8 °C, because the values of the variables, a, b, r, and apart from the constant, A T, in Eq. (79), are fixed for the sphere at 12489.87, -24.6042, 50, 0.14 and 3.32, respectively. The value of Tc thus calculated is in fair agreement with the value of 130 °C measured actually by John for the sphere [69, 70]. Once again, if the sawdust of Kiefemholz is assumed to be in fact the sawdust of Douglas fir, the Tc for a sawdust heap of Kiefemholz, formed into an infinite slab, 40 cm in thickness, and placed in the atmosphere under isothermal conditions, which is also cited in Table 21, is calculated at 139.0 °C, because the values of the variables, a, b, r, dfc and dc, apart from the constant, A T, in Eq. (79), are fixed for the infinite slab at 12489.87, -24.6042, 20, 0.14 and 0.878, respectively. The value of 7) thus calculated is in fair agreement with the value of 140 °C measured actually by John for the slab [69]. 

Pinaceae family Pinus spp. Picea spp. Thuja plicata Pseudotsuga Pine Spruce Western red cedar Douglas fir, Oregon pine y-Pinene, A-3-carene, thunbergol B-Thujaplicin 20% Sawdust in pet. 20% Sawdust in pet. 20% Sawdust in pet. 20% Sawdust in pet. Soft woods, allergy more commonly seen in carpenters or joiners... 

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