Tris(hydroxymethyl)aminomethane ：
Grade for cell culture , ≥99.9% (T)
Purity ≥99.9% (T)
solubility in water clear colorless , 200g plus 300ml of water
water ≤0.2%(K.F)
UV absorbance ≤ 0.05 at 290nm (40%w/w)
heavy metals (as lead) ≤2 ppm
Cell culture test pass
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