Tetrahydrofuran Specification Comparison chart by Sigma-Aldrich.

Sigma-Aldrich Tetrahydrofuran Specifications Comparison
	CHROMASOLV Plus	Biotech	Anhydrous	Anhydrous	Spectro- photometric	ACS	ReagentPlus
Purity	≥99.9%	≥99.9%	≥99.9%	≥99.9%	≥99.5%	≥99%	≥99%
UV Absorption
λ: 212 nm		≤1.00			≤1.00
λ: 245 nm	≤0.30
λ: 250 nm		≤0.18			≤0.18
λ: 275 nm	≤0.05
λ: 300 nm		≤0.02			≤0.02
λ: 315 nm	≤0.004
λ: 350 nm		≤0.005			≤0.005
λ: 400 nm		≤0.005			≤0.005
Total Impurities
Inhibitor	Inhibitor-free	Inhibitor-free	Inhibitor-free	250 ppm BHT	Inhibitor-free	250 ppm BHT	250 ppm BHT
Water	≤0.05%	≤0.005%	≤0.002%	≤0.002%	≤0.02%	≤0.05%
Water			≤0.005% (100mL)	≤0.005% (100mL)
Evaporation Residue	≤0.001%		≤0.0005%		≤0.0005%	≤0.03%
Titratable acid	≤0.002% free acid (as CH₃COOH)
Peroxide	=0.05% peroxide (as H₂O₂)	≤0.005% peroxide (as H₂O₂)	≤0.002% peroxide (as H₂O₂)		≤0.015% peroxide (as H₂O₂)	≤0.015% peroxide (as H₂O₂)
Packaging Options
	CHROMASOLV Plus	Biotech	Anhydrous	Anhydrous	Spectro- photometric	ACS	ReagentPlus
Glass Bottle	34865				242888	360589	178810
PVC Coated Bottle	439215					437638
Sure/Seal^™		494461	401757	186562
Aluminum Bottle						676764
NOWPAK^™	34865
Pure-Pac^™	34865	494461	401757	186562
Carbon Steel						360589	178810
Drum						360589

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Specification Comparison