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Janice Carter, University of Cambridge

The person in WPI I deal with is Julian Williams and he has been very helpful in sorting out any problems we may have and finding items that we require. He is very pleasant to deal with and I have used WPI for the last 8 years and I am very happy with the service that they provide us.
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Home > Products > Glass > MicroFil > Custom Length MicroFil

Custom Length MicroFil

Custom length flexible needle that are perfect for filling micropipettes

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 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. Custom lengths are sold in packages of 4.

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 fitting allows easy coupling to syringes and syringe filters.

Options

Select the gauge based on the chart below
Custom length (up to 50cm) - Enter length in comments at checkout
Packages of 4

Order code	Gauge	ID (µm)	OD (µm)	Length
CMF20G	20G	700	850	1-50cm
CMF22G	22G	530	700
CMF23G	23G	530	665
CMF26G	26G	320	430
CMF28G	28G	250	350
CMF31G	31G	100	238
CMF34G	34G	100	164
CMF35G	35G	75	144
CMF90U	~36G	20	90	1-10cm

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

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.