It's 12x1.5x1.5 they say it's a 60g tube but the most I've put in is a oz...
What kind of material and how are you preparing it?
Your tube has about 21 cubic inches and I would normally pack about 89 grams of prime bud in that space, if it were ground to 10 mesh and packed to 4.2 grams per cubic inch density.
Material unground or packed to less density, will weigh less, but that should give you a good upper limit. Trim also weighs less than prime bud, because of the buds higher resin content, which weighs more per unit volume than the rest of the plant material.
On a side note, 1 1/2" tube is a little big for a single pass column. It is harder to pack so that the butane doesn't just find an easy way through, than something under an inch.