Custom MicroFil Flexible Plastic Needles

Order code

Flexible plastic needle that is perfect for filling micropipettes

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

WPI's MicroFil flexible plastic needles 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. The MicroFil needle can be stored for days with the filling solution inside without clogging. Sold in 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

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 plastic 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.

Custom Lengths

MicroFil can be cut into custom lengths from 1 cm - 50 cm for most sizes. Note that the CMF90U is available in 1-10cm lengths. Please specify the length IN THE COMMENTS BOX AT THE CHECKOUT when ordering. Note the length (in one centimeter increments).


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. 


  • 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.

W. Meier, G. Greune, A. Meyboom, K.P. Hofmann "Surface tension and viscosity of surfactant from the resonance of an oscillating drop" Eur Biophys J 29. 2000: 113-124

©Copyright 2021. World Precision Instruments. All rights reserved.

Apply for Tax Exempt Status
WPI collects tax in AL, AZ, CA, CO, CT, DC, FL, GA, IL, IN, MA, ME, MD, MI, MN, MO, NC, NV, NJ, NY, OH, OK, PA, SC, TN, TX, VA, VT, WA and WI