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Density Marker Beads / Specific Density Microspheres:

Density marker beads offer high density tolerances of ±0.005 g/cc enabling excellent stratification, and bright coloration for high visibility with the unaided eye. Density marker beads of accurately known mass density are generally used as an external marker to facilitate the monitoring of the density gradient shape and range.  Historically Beads in the size ranges of 212-250um or 250-300um are used, but other sizes can also be used.

The density marker beads provide a rapid, simple, and accurate method for measuring the density. Generally a set of several such beads, covering a range of densities, is used. In the biomedical industry researchers are sometimes looking for cells having targeted specific gravities. In order to locate these cells in test tubes it is useful to have colored marker beads which will show where the delineation between specific densities occurs. Density marker beads are also used for calibrating particles in other industries, such as agriculture, microbiology and others.

Note:
1) As our microspheres are made from hydrophobic polyethylene they should be wet with a surfactant such as Tween 80 prior to use.
2) We have found that sucrose will bond to our spheres, thus increasing there density.  We do not recommend using our spheres with sucrose gradients.

Contact us for a quote and lead time for your custom density microspheres application.

Click on the link under "Microsphere type:" for pricing and size breakdowns for each product.
Product Code Microsphere Type: Density
(g/cc)		 Sizes
Available
Min. - Max.
YPMS Yellow Polyethylene 1.000 27-425um
UVPMS-BG-1.01 Fluorescent Green 1.01 250-425um
UVPMS-BG-1.015 Fluorescent Green 1.015 10-355um
UVPMS-BO-1.015 Fluorescent Orange 1.015 355-500um
UVPMS-BG-1.020 Fluorescent Green 1.020 425-600um
UVPMS-BG-1.025 Fluorescent Green 1.025 10-1000um
UVPMS-BG-1.030 Fluorescent Green 1.030 355-600um
UVPMS-BO-1.030 Fluorescent Orange 1.030 125-355um
UVPMS-BG-1.035 Fluorescent Green 1.035 355-600um
UVPMS-BG-1.040 Fluorescent Green 1.040 212-600um
REDPMS-1.040 Red Polyethylene 1.040 425-600um
UVPMS-BO-1.040 Fluorescent Orange 1.040 10-355um
UVPMS-BR-1.050 Fluorescent Red 1.050 10-500um
REDPMS-1.055 Red Polyethylene 1.055 425-600um
REDPMS-1.065 Red Polyethylene 1.065 90-600um
REDPMS-1.070 Red Polyethylene 1.070 425-600um
BLPMS-1.075 Blue Polyethylene 1.075 10-600um
REDPMS-1.075 Red Polyethylene 1.075 212-600um
REDPMS-1.080 Red Polyethylene 1.080 250-600um
REDPMS-1.085 Red Polyethylene 1.085 10-600um
UVPMS-BR-1.090 Fluorescent Red 1.090 10-500um
REDPMS-1.10 Red Polyethylene 1.10 425-600um
REDPMS-1.12 Red Polyethylene 1.12 212-600um
Custom Custom Density Polyethylene 0.96 - 1.5 Varies

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Yellow Microspheres Polyethylene 10-1000um (1mm), Yellow Spheres, Fluid Flow Visualization, Testing of Medical Devices
YPMS - Yellow Polyethylene Microspheres - 1.000g/cc - R&D Vials

27um-425um, Yellow polymer microspheres. Density 1g/cc for water suspension.
Fluorescent Microspheres Polyethylene (Fluorescent Green in daylight, Green in 365nm UV) 250 micron to 425 micron Diameter
UVPMS-BG-1.01 - Fluorescent Green Microspheres - 1.01g/cc - R&D Vials

250um - 425um, Fluorescent green microspheres.  1.01g/cc Designed as density markers
Fluorescent Microspheres Polyethylene, Bright Green response 355 micron to 500 micron Diameter
UVPMS-BG-1.015 - Fluorescent Green Microspheres - 1.015g/cc - R&D Vials

355um - 500um, Fluorescent green microspheres.  1.015g/cc Designed as density markers
Fluorescent Microspheres Polyethylene (Fluorescent Orange in daylight, Orange in 365nm UV) 10 micron to 355 micron Diameter
UVPMS-BO-1.015 - Fluorescent Orange Microspheres - 1.015g/cc - R&D Vials

10-355um,Fluorescent Orange microspheres show Orange luminescence under UV and visible light. Designed for water suspension
Fluorescent Microspheres Polyethylene, Bright Green response 425 micron to 600 micron Diameter
UVPMS-BG-1.020 - Fluorescent Green Microspheres - 1.020g/cc - R&D Vials

425um - 600um, Fluorescent green microspheres.  1.02g/cc Designed as density markers
Fluorescent Microspheres Polyethylene (Fluorescent Green in daylight, Green in 365nm UV) 200 micron to 1000 micron Diameter
UVPMS-BG-1.025 - Fluorescent Green Microspheres - 1.025g/cc - R&D Vials

38um - 1000um, Fluorescent green microspheres. 1.025g/cc Designed for sea water suspension
Fluorescent Microspheres Polyethylene, Bright Green response 355 micron to 600 micron Diameter
UVPMS-BG-1.030 - Fluorescent Green Microspheres - 1.030g/cc - R&D Vials

355um - 600um, Fluorescent green microspheres.  1.03g/cc Designed as density markers
Fluorescent Microspheres Polyethylene (Fluorescent Orange in daylight, Orange in 365nm UV) 125 micron to 355 micron Diameter
UVPMS-BO-1.030 - Fluorescent Orange Microspheres - 1.030g/cc - R&D Vials

125-355um,Fluorescent Orange microspheres show Orange luminescence under UV and visible light. Designed for water suspension
Fluorescent Microspheres Polyethylene, Bright Green response 355 micron to 600 micron Diameter
UVPMS-BG-1.035 - Fluorescent Green Microspheres - 1.035g/cc - R&D Vials

355um - 600um, Fluorescent green microspheres.  1.035g/cc Designed as density markers
Red Polymer Microspheres 0.43mm-0.6mm, Specific Gravity of 1.04g/cc
REDPMS-1.04 - Red Polyethylene Microspheres - 1.04g/cc - R&D Vials

425um-600um, Red Polyethylene spheres, density of 1.04 g/cc.
Fluorescent Microspheres Polyethylene, Bright Green response 212 micron to 600 micron Diameter
UVPMS-BG-1.040 - Fluorescent Green Microspheres - 1.040g/cc - R&D Vials

212um - 600um, Fluorescent green microspheres.  1.04g/cc Designed as density markers
Fluorescent Microspheres Polyethylene (Fluorescent Orange with 300-500nm excitation) 10 micron to 355 micron Diameter
UVPMS-BO-1.040 - Fluorescent Orange Microspheres - 1.040g/cc - R&D Vials

10-355um,Fluorescent Orange microspheres show Orange luminescence under UV and visible light. Designed for water suspension
Fluorescent Red Microspheres Polyethylene, 10 micron to 500 micron Diameter, 1.05g/cc density
UVPMS-BR-1.050 - Fluorescent Red Microspheres - 1.050g/cc - R&D Vials

10-500um,Fluorescent Red microspheres show Red luminescence under a wide spectrum.
Red Polymer Microspheres 0.43mm-0.6mm, Specific Gravity of 1.055g/cc
REDPMS-1.055 - Red Polyethylene Microspheres - 1.055g/cc - R&D Vials

250um-600um, Red Polyethylene spheres, density of 1.055 g/cc.
Red Polymer Microspheres 90-600um, Specific Gravity of 1.065g/cc
REDPMS-1.065 - Red Polyethylene Microspheres - 1.065g/cc - R&D Vials

90um-600um, Red Polyethylene spheres, density of 1.065 g/cc.
Red Polymer Microspheres 0.43mm-0.6mm, Specific Gravity of 1.07g/cc
REDPMS-1.070 - Red Polyethylene Microspheres - 1.070g/cc - R&D Vials

425um-600um, Red Polyethylene spheres, density of 1.070 g/cc.
Translucent Blue Polymer Microspheres. Blue Polyethylene Spheres. Blue Polymer Spheres. 10 micron, 100 micron, 600 micron, Flow Studies. Flow Visualization
BLPMS-1.075 - Blue Polyethylene Microspheres - 1.075g/cc - R&D Vials

10um-600um,Blue polymer spheres, density of 1.075 g/cc for flow visualization studies.
Red Polymer Microspheres 0.2mm-0.6mm, Specific Gravity of 1.075g/cc
REDPMS-1.075 - Red Polyethylene Microspheres - 1.075g/cc - R&D Vials

212um-600um, Red Polyethylene spheres, density of 1.075 g/cc.
Red Polymer Microspheres 0.25mm-0.6mm, Specific Gravity of 1.080g/cc
REDPMS-1.080 - Red Polyethylene Microspheres - 1.080g/cc - R&D Vials

250um-600um, Red Polyethylene spheres, density of 1.080 g/cc.
Red Polymer Microspheres 0.01mm-0.6mm, Specific Gravity of 1.085g/cc
REDPMS-1.085 - Red Polyethylene Microspheres - 1.085g/cc - R&D Vials

10um-600um, Red Polyethylene spheres, density of 1.085 g/cc.
Fluorescent Red Microspheres Polyethylene, 10 micron to 500 micron Diameter, 1.09g/cc density
UVPMS-BR-1.090 - Fluorescent Red Microspheres - 1.090g/cc - R&D Vials

10-500um,Fluorescent Red microspheres show Red luminescence under a wide spectrum.
Red Polymer Microspheres 0.43mm-0.6mm, Specific Gravity of 1.10g/cc
REDPMS-1.10 - Red Polyethylene Microspheres - 1.10g/cc - R&D Vials

425um-600um, Red Polyethylene spheres, density of 1.10 g/cc.
Red Polymer Microspheres 0.2mm-0.6mm, Specific Gravity of 1.12g/cc
REDPMS-1.12 - Red Polyethylene Microspheres - 1.12g/cc - R&D Vials

212um-600um, Red Polyethylene spheres, density of 1.12 g/cc.
Polysorbate 80
10ml Vial of Biocompatible Surfactant
Our Price: $15.00

Non-toxic bio-compatible surfactant can be used in laboratory research and development applications to improve wetting of hydrophobic microspheres.