For determination of pH- value.
Plastic dispensing reel with 1 roll of indicator paper and colour scale.

For semi-quantitative determinations.

Medium fast filtration, smooth.
For fat determinations, free from fats and resins. Ether soluble residue <0.1 mg for diam. 270 mm filters.

Screw neck vials for storage of liquid samples.

• Wide opening
• Short thread
• Flat bottom

Medium filtration, smooth.

Transparent, smooth. 40 g/m² paper
Block of 100 sheets.

Further weighing aids available on request.

For determination of pH-value.
Roll length 5m, 10mm width. With three colour zones, without hydrophobic zone.
Plastic container with 1 roll of indicator paper and colour scale.

Support materials for TLC ready-to-use layers

Glass plates: glass, ~ 1.3 mm thick, high requirements for weight, packaging and storage, ideal torsional strength, high temperature stability, susceptible to breakage, can not be cut with scissors, high resistance against solvents, mineral acids and conc. ammonia, suitability for aqueous detection reagents depends on the phase

POLYGRAM^®: polyester, ~ 0.2 mm thick, low requirements for weight, packaging and storage, low torsional strength, max. 185 °C temperature stability, not susceptible to breakage, can be cut with scissors, high resistance against solvents, mineral acids and conc. ammonia, very suitable for aqueous detection reagents

ALUGRAM^®: aluminium, ~ 0.15 mm thick, low requirements for weight, packaging and storage, relatively high torsional strength, high temperature stability, not susceptible to breakage, can be cut with scissors, high resistance against solvents, low resistance against mineral acids and conc. ammonia, limited suitability for aqueous detection reagents
Glass plates, POLYGRAM^®, ALUGRAM^®

• Silica 60
• Specific surface (BET) ~500 m²/g
• Mean pore size 60 Å
• Specific pore volume 0.75 ml/g
• Particle size 5 to 17 µm
• Standard grade
• Thickness of layer for analytical plates 0.25 mm, for preparative plates 0.5 and 1 mm
• For 2 mm preparative layers a slightly coarser material is used, indicators: manganese activated zinc silicate with green fluorescence for short-wave UV (254 nm)
• Binders: highly polymeric products, which are stable in almost all organic solvents and resistant towards aggressive visualisation reagents
• Binder system for Polygram^® sheets is also completely stable in purely aqueous eluents
• Available as glass plates, Polygram polyester sheets and Alugram aluminium sheets
• Available with or without fluorescent indicator (UV 254)

Snap ring / crimp neck vials N11 may be sealed either with a snap ring closure N11 or a crimp closure N11.

Medium speed, smooth.

The syringe filters are used for filtration of suspended matter from liquid samples and are certified for HPLC. Standard CHROMAFIL syringe filters are color coded. CHROMAFIL Xtra syringe filters are labeled for method validation and certification. All CHROMAFIL syringe filters are autoclavable (121 °C and 1.1 bar for 30 min).
Hydrophilic membrane, for aqueous solutions, water-soluble oligomers and polymers like proteins binding capacity for proteins 20 µg/25 mm filter.

The syringe filters are used for filtration of suspended matter from liquid samples and are certified for HPLC. Standard CHROMAFIL syringe filters are color coded. CHROMAFIL Xtra syringe filters are labeled for method validation and certification. All CHROMAFIL syringe filters are autoclavable (121 °C and 1.1 bar for 30 min).
Hydrophilic membrane for aqueous and light organic solutions. Very low adsorption of pharmaceuticals and proteins. Good stability against acids and bases. Binding capacity for proteins 29 µg per 25 mm filter.

Fast filtration, smooth, ashless.

Pack of 100 pieces.
Other sizes and weighing aids available on request.

Roll length 5 m, 10 mm width. With two colour zones. Plastic box with 1 roll of indicator paper and colour scale. Duotest indicator papers combine two different indicator zones on a single strip. The zones are separated by a hydrophobic barrier, which effectively prevents mixing of the reaction colors, simplifying and precisely assigning the pH value.

The syringe filters are used for filtration of suspended matter from liquid samples and are certified for HPLC. Standard CHROMAFIL syringe filters are color coded. CHROMAFIL Xtra syringe filters are labeled for method validation and certification. All CHROMAFIL syringe filters are autoclavable (121 °C and 1.1 bar for 30 min).
A hydrophobic membrane. Ideal for filtration of non-polar liquids and gases. It is very resistant to various solvents as well as acids and bases. By flushing with alcohol, followed by water, the original hydrophobic membrane can be made more hydrophilic.

Hydrophilic membrane for polar as well as non-polar solvents. The HPLC filter, especially suited for mixtures of water and organic solvents; for TOC/DOC determination; not cytotoxic, does not inhibit the growth of microorganisms and higher cells. Polyester filter with integrated glass fibre prefilter (GF/PET): recommended for solutions with a high load of particulate matter or for highly viscous solutions.

Turbidity elimination before photometric analysis (without digestion).

• Sample preparation set: 2 syringes 20 ml, 25 CHROMAFIL^® membrane filters
• Membrane filters CHROMAFIL^® without accessories

Combination phase for SPE of hydrocarbons from water acc. to DIN H53 / ISO DIS 9377-4

Special combination phase of sodium sulphate and Florisil^®.

Recommended application: hydrocarbons from drinking, surface and waste waters.

The syringe filters are used for filtration of suspended matter from liquid samples and are certified for HPLC. Standard CHROMAFIL syringe filters are color coded. CHROMAFIL Xtra syringe filters are labeled for method validation and certification. All CHROMAFIL syringe filters are autoclavable (121 °C and 1.1 bar for 30 min).
Hydrophilic membrane with very low adsorption for aqueous and organic/aqueous liquids i.e. polar and medium polar sample solutions. Binding capacity for proteins 84µg/25mm filter.

For determining water hardness.
Colour change from green to red.

Hydrophilic membrane for filtration of water-soluble oligomers and polymers, especially suited for biological macromolecules. Very high shape stability in aqueous solutions extremely low binding capacity for proteins (21µg/ 25mm filter).

Can be used up to a maximum of 200 °C. With organic binder.

For determination of pH- value. Permanent colour. Non bleeding.

Acid washed, calcined. Pack of 1000 g.

Inert Filter, nominal pore size 1µm, allows higher flow rates than smaller pore filters. For solutions with high loads of particulate matter or for highly viscous solutions (e. g. soil samples, fermentation broths) as prefilters for other CHROMAFIL^® filters, they prevent plugging of the membrane.

Hydrophilized polytetrafluoroethylene syringe filters labelled for method validation and certification

• Hydrophobic membrane with additional hydrophilic characteristics
• For polar and nonpolar solutions
• Resistant against all kinds of solvents as well as acids and bases

Medium-fast.

• Embossed
• For determination of sugar content, colour, essential oils and emulsions
• Weight: 75 g/m²
• Thickness: 0.25 mm

This test paper allows the quick and easy detection of strong oxidizers such as nitrite and free chlorine. Potassium iodide starch paper is also used to control diazotization reactions. Nitrite or free chlorine oxidize potassium iodide to form elemental iodine which reacts with starch to a blue-violet complex. Potassium iodide starch paper may be used by dipping it into the sample or by applying drops of the sample onto the paper. To detect gaseous oxidizers, the paper is moistened with distilled water and then exposed to the gas in question.

Hydrophilic membrane. The membrane is recommended for filtration of medium polar organic/aqueous liquids.

Fibre-glass reinforced adhesive tape for sealing hazardous goods cartons.

Watesmo allows the quick and easy detection of water and water vapor in organic solvents.

Scope of supply:
1 reel (5 m length, 10 mm width)

For determination of pH value.
Roll length 5 m, 14 mm width. With 3 colour zones and 2 hydrophobic zones. The zones are separated by a hydrophobic barrier, which effectively prevents mixing of the reaction colours and increases mechanical stability.
Plastic container with 1 roll of indicator paper and colour scale.

Medium-fast, smooth, ashless.

Fast filtration, smooth, ashless. With elevated border.

C18 phase with special polymeric, crosslinked surface modification - USP L1
pore size 110 Å, particle sizes 1,8µm, 3µm and 5µm; 20%C
high steric selectivity
outstanding surface deactivation
suitable for LC/MS due low bleeding characteristics
pH stability 1 - 10
broad range of application: steroids, (o,p,m-) substituted aromatics, fat-soluble vitamins

• Fat determination in food and feed
• Determination of binder content in asphalt
• Analysis of soil contaminants
• Determination of additives in rubber and elastomers

Fast filtration, smooth.

Membranes of cellulose mixed esters are ideal for gravimetric analysis. They are particularly suited for aqueous solutions. The hydrophilic membrane is thermally stable to 125 °C and can be autoclaved at 121 °C. This membrane is often used for contamination tests.

Hydrophilic membrane. This membrane is recommended for all filtrations of aqueous or polar organic samples.

Screw neck vials for storage of liquid samples.

• Small opening
• 8-425 thread
• Flat bottom
• Label area and scale

For improved volatility, better thermal stability or low limit of detection in gas chromatography prerequisite: quantitative, rapid and reproducible formation of only on derivative halogen atoms introduced by derivatisation (e.g. trifluoroacetates) allow specific detection (ECD) with the advantage of high sensitivity elution order and fragmentation patterns in MS can be influenced by a specific derivatisation.
Reagents for silylation - alkylation (methylation) - acylation are available.
Which is the proper reagent for acylation?
Test kit for determination of the optimum acylation.

For improved volatility, better thermal stability or low limit of detection in gas chromatography prerequisite: quantitative, rapid and reproducible formation of only on derivative halogen atoms introduced by derivatisation (e.g. trifluoroacetates) allow specific detection (ECD) with the advantage of high sensitivity elution order and fragmentation patterns in MS can be influenced by a specific derivatisation.
Reagents for silylation - alkylation (methylation) - acylation are available.
Acylation with fluorinated acid anhydrides can be used for alcohols, phenols, carboxylic acids, amines, amino acids and steroids forming volatile, stable derivatives suited for FID as well as for ECD detection.

by-products of acylation with anhydrides: corresponding acids
excess reagent and the acid formed have to be removed

Heptafluorobutyric acid anhydride (HFBA)
m.w. 410.06, Bp 106 - 107°C (760mm Hg),
C₃F₇ - CO - O - CO - C₃F₇
density d20°/4° = 1.665

For improved volatility, better thermal stability or low limit of detection in gas chromatography prerequisite: quantitative, rapid and reproducible formation of only on derivative halogen atoms introduced by derivatisation (e.g. trifluoroacetates) allow specific detection (ECD) with the advantage of high sensitivity elution order and fragmentation patterns in MS can be influenced by a specific derivatisation.
Reagents for silylation - alkylation (methylation) - acylation are available.
Acylation with fluorinated acid amides is recommended for alcohols, primary and secondary amines as well as for thiols under mild, neutral conditions. MBTFA also forms very volatile derivatives with carbohydrates.

by-products: corresponding neutral acylamides, which can be easily removed due to their high volatility; because of neutral conditions and favourable chromatographic properties often removal of the bisacylamide is not necessary. Thus sample preparation is much more convenient.

MBTFA / MBHFBA
N-methyl-bis(trifluoroacetamide) MBTFA
m.w. 223.08, Bp 123 - 124°C (760mm Hg), density d20°/4° = 1.55,
CF₃ - CO - N(CH₃) - CO - CF₃

Support materials for TLC ready-to-use layers

Glass plates: glass, ~ 1.3 mm thick, high requirements for weight, packaging and storage, ideal torsional strength, high temperature stability, susceptible to breakage, can not be cut with scissors, high resistance against solvents, mineral acids and conc. ammonia, suitability for aqueous detection reagents depends on the phase

POLYGRAM^®: polyester, ~ 0.2 mm thick, low requirements for weight, packaging and storage, low torsional strength, max. 185 °C temperature stability, not susceptible to breakage, can be cut with scissors, high resistance against solvents, mineral acids and conc. ammonia, very suitable for aqueous detection reagents

ALUGRAM^®: aluminium, ~ 0.15 mm thick, low requirements for weight, packaging and storage, relatively high torsional strength, high temperature stability, not susceptible to breakage, can be cut with scissors, high resistance against solvents, low resistance against mineral acids and conc. ammonia, limited suitability for aqueous detection reagents
Silica 60, specific surface (BET) ~ 500m²/g, mean pore size 60Å, specific pore volume 0.75ml/g, particle size 5 to 17µm. Outstanding hardness and abrasion resistance due to an optimized binder system. Increased separation efficiency due to an optimized particle size distirbution. High suitability for trace analyses resulting from a UV indicator with brilliance and a low-noise background of the layer.

Available as glass plates with or without fluorescent indicator (UV254).