MIL --- D TL --- 211F
e va pora ting dish. Wa sh the be a ke r a nd pa pe r thre e time s into the e va pora ting dish using a tota l
of 50 ml of me thyle ne chloride . Pla ce the e va pora ting dish conta ining the filtra te a nd wa shings
on a ste a m ba th a nd e va pora te to a bout 3 ml of solution. D o not he a t the re sidue to dryne ss a s
loss of dust suppre ssa nt ma y occur. Re move from the ste a m ba th a nd e va pora te the re ma ining
me thyle ne chloride in a n a ir or nitroge n stre a m. D ry off tra ce s of outside moisture , cool in a
de sicca tor, a nd we igh. Ca lcula te the pe rce nt by we ight dust suppre ssa nt a s follows:
Pe rce nt dust suppre ssa nt = 100(A --- B)/W
whe re :
A=
We ight of dish a nd re sidue , in gra ms
B=
We ight of dish, in gra ms
W=
We ight of spe cime n, in gra ms
4.2.4.5 Particle Size. (NOTE: Use ASTM C117 as a guideline in conducting this analysis)
Ta re sie ve s conforming to ASTM E 11. Both sie ve s sha ll be 3 inche s in dia me te r. Mix 10 to 13
gra ms of the spe cime n with 100 ml of wa te r. Pour R P/wa te r mixture into the sie ve a nd wa sh the
spe cime n through with more wa te r until the qua ntity of ma te ria l pa ssing through the sie ve doe s
not e xce e d a tra ce . Sie ving ma y be conducte d using one sie ve a t a time to a id in the sie ving
proce ss. Assure a ll wa te r a nd spe cime n wa she d through first sie ve is re ta ine d for subse que nt
sie ve . D ry the sie ve s in a la mina r flow be nch for 7 to 8 hours. Ca lcula te the pe rce nt of spe cime n
re ta ine d a s follows:
Pe rce nt re ta ine d = 100 (A --- B)
W
whe re :
A=
We ight of the sie ve a nd conte nts, a fte r drying, in gra ms
B=
Ta re we ight of the sie ve , in gra ms
W=
We ight of spe cime n, in gra ms
Pe rce nt re ta ine d on the se cond sie ve is a dde d to the first sie ve .
4.2.4.6 Volatiles. Ta re a cle a n, dry wa tch gla ss a nd re cord a ll we ights to the ne a re st 0.1 mg.
Add 5 g of the R P spe cime n to the wa tch gla ss a nd re cord the gross we ight. Pla ce the wa tch gla ss
a nd spe cime n in a drying ove n a t 103 _C for 2 hours. At the e nd of the drying time , pla ce the
wa tch gla ss a nd spe cime n in a de sicca tor. Cool a nd we igh to a consta nt we ight. Ca lcula te the
pe rce nt by we ight vola tile s a s follows:
Pe rce nt vola tile s = 100 (A --- B)/W
whe re :
A=
We ight of spe cime n a nd conta ine r be fore drying, in gra ms
B=
We ight of spe cime n a nd conta ine r a fte r drying, in gra ms
W=
We ight of spe cime n, in gra ms
9
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