Screw closure,N 9,PP,blue,c. hole,Sili. w./Polyimide or,slit,1.0mm,fluorine-free

$45.50 * $0.00 * (0% Saved)

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Delivery time approx. 5 working days

702405 02301023502009
Package unit 100 Piece(s)
Quantity:
Price overview
Quantity Price/unit
To 9 $45.50
From 10 $38.75
From 50 $35.00
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Closure is laminated with Polyimide (fluorine-free) instead of PTFE; thus suitable for analysis... more

Closure is laminated with Polyimide (fluorine-free) instead of PTFE; thus suitable for analysis of fluorinated organic compounds (e.g. PFAS analysis). Slit serves as a penetration aid for thick and dull HPLC needles.

Closure type Screw closure
Nominal diameter N 9
Assembling process Assembled
Cap material Polypropylene (PP)
Cap color Blue
Cap hole Yes
Closure magnetic No
Septa material Silicone/Polyimide
Colors of septa material White/orange
Septa thickness 1.0 mm / 39,4 mil
Septa hardness 45° shore A
Additional closure features Fluorine-free
Recommended application(s) HPLC, PFAS analysis
Storage temperature 15–25 °C / 59–77 °F
Scope of delivery 100x N 9 ready assembled screw closures
Gross weight (incl. packaging) 29.5 g / 0.06 lbs
Packaging dimensions 125 x 100 x 15 mm / 4.92 x 3.94 x 0.59 Inch
Hazardous material No
Learn more

PTFE-free closures (fluorine-free) 

PTFE (polytetrafluoroethylene) covers most elastomeric liners in chromatography closures. It is the chemically resistant barrier that on one hand protects the elastomer layer (like silicone or rubber) from being destructed by aggressive solvents/samples and on the other hand the samples from any contaminants possibly emerging out of the carrier material. While it is generally recommendable to have such a chemically resistant barrier between sample and carrier material, the PTFE lamination may become a problem in the analysis of fluorinated compounds, as in e.g. PFAS analysis, as there is the risk that fluorine from the PTFE may migrate into the sample.

A fluorine-free septum, i.e. a septum with a Polyimide instead of a PTFE lamination as the chemically resistant barrier, is therefore recommendable to ensure reliable analysis results. MACHEREY-NAGEL offers a screw closure N 9 (REF 702402) and a snap ring closure N 11 (REF 702403) with a Silicone/Polyimide septum. The Silicone as a carrier material offers safe penetration and high analytical purity. If used on HPLC instruments with thick and blunt needles, the screw closure N 9 with slit Silicone/Polyimide septum (MN REF 702405) is recommended. For PFAS analysis the closures are used in combination with plastic vials.

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