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Dr Andy MacKenzie, University of the West of Scotland

I have had dealings with WPI for several years and have consistently found their customer service to be second-to-none. They have always provided fast and insightful responses to any technical query and such support has been of enormous help to my laboratory.
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MicroFil

Flexible needle that is perfect for filling micropipettes.

MicroFil fills micropipettes easily and reliably. Its long and fine tip allows you to start the filling very close to the pipette tip, eliminating both air bubble formation and clogging due to the washing down of dust particles. The transparent amber MicroFil needle is constructed from a combination of plastic and fused silica - no metal components are used.

WPI's MicroFil is designed to fill micropipettes easily and reliably. These flexible pipetting needles are long and have a fine tip allowing you to start the filling very close to the pipette tip, eliminating both air bubble formation and clogging due to the washing down of dust particles. The MicroFil has a luer lock end fitting for easy coupling to syringes and syringe filters. The transparent amber MicroFil needle is constructed from a combination of plastic and fused silica. The MicroFil plastic needle may be stored for days with the filling solution inside without clogging. Sold in packages of 5.

Tip Flexibility

The MicroFil's tip elasticity is sturdy and very flexible though not unbreakable. Since it is more flexible than stainless steel needles, moderate bending will not block or damage the MicroFil needle. The combination of plastic and fused silica in the MicroFil tip is sturdier than plastic tips, allowing easy and repeated insertions into micropipettes. MicroFil's luer lock fitting allows easy coupling to syringes and syringe filters.

Options

Order code	Gauge	ID (µm)	OD (µm)	Length (mm)
MF34G-5	34	100	164	67
MF28G-5	28	250	350	97
MF28G67-5	28	250	350	67

MicroFil is constructed of fused silica, coated with Polyimide. The female luer lock fitting is HDPP and is held in place with a medical grade UV adhesive.

Custom MicroFil cut to your desired length is also available.

Autoclavability

HDPP High Density Polypropylene–Autoclavable (Maximum temperature: 135°C)
Polyimide coating–Autoclavable (Maximum temperature: 400°C)
UV adhesive can tolerate three autoclave cycles to 80% strength, 15 min. at 130°C. It breaks down after five cycles with a strength of 15%.

NOTE: The fused silica tubing is susceptible to water intrusion that makes it more fragile. Pressurized steam increases this fragility.