Merck 105559 0001 Silicagel 60 RP-18 F₂₅₄s (1 Adet).

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Description
Catalogue Number	105559
Replaces	5559-7; 5559
Overview	RP modified plates serve two purposes: act as a pilot method for HPLC and allow to choose various solvent system for special separations. Our RP-modified silica layers are well suited for many separation challenges that unmodified silica cannot overcome. These layers use aqueous solvent systems to separate extremely non-polar substances and analyze particular polar substances that can adapt to ion-pair chromatography. What’s more, RP-modified silica layers are less dependent on atmospheric humidity. Unlike unmodified silica, RP-phases do not exhibit catalytic activity. This makes them the plates of choice for unstable substance that tend to experience oxidative degradation.

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Product Information
HS Code	3822 19 90
Quality Level	MQ100

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Applications
Application	Aluminum TLC plates, RP-18 modified silica gel coated with flourescent indicator F254s. The RP-18 modified silica gel TLC plates come in a quantity of 20 size 20x20 cm for thin layer chromatography applications.

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Safety Information according to GHS
Storage class	10 - 13 Other liquids and solids

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Storage and Shipping Information
Storage	Store at +2°C to +30°C.

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Specifications
Specific surface area (according to BET; 5-Pt. measurement)	480 - 540 m²/g
Pore volume (N₂-isotherm)	0.74 - 0.84 ml/g
d 50 (laser diffraction, size distribution)	9.5 - 11.5 µm
Layer thickness	160 - 200 µm
Deviation of layer thickness per plate	≤ 30 µm
Chromatographic testings:\nA) Cholesterin test
hRf-values\n- cholesterin, cholesterin test	32 - 39
B) Steroid test
- methyltestosterone, steroid test	14 - 22
- Reichstein S, steroid test	26 - 36
- hydrocortisone, steroid test	36 - 46
Typical value determined on an activated sheet (120°C, 15 min)\nEluent a) aceton/ water (95/5 v/v)\nEluent b) aceton/ water (60/40 v/v)