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GENERAL PURPOSE GLASS MICROSPHERES
 - Narrow distribution sieve fractions

Over 40 Grades from 25mm to 4mm
One of the largest range of sieve fractions
High performance sonic sieving process

The complete particle size distribution of these General Purpose Glass Microspheres are not traceable to any International standard, only the start and finish points of the distribution. There may be slight variations from batch to batch. They are particularly useful as general purpose research microspheres or spacer beads in a range of lower grade applications. They may also be used as a preliminary material with which to assess the performance of particle size equipment, after which a higher specification traceable standard may be used as the final calibrant.

 
PRICES
 
SIEVE FRACTION (mm) NOMINAL
WEIGHT
(g)		 CATALOGUE
NUMBER		 PRICE
£
GBP

€
EURO*

 $
USD*
SPECIAL ORDER
25 - 32
2 Week Lead Time		 100 GP0029 60 90 120
38 - 45 100 GP0042 40 60 80
45 - 53 100 GP0049 40 60 80
63 - 75 100 GP0069 30 45 60
75 - 90 100 GP0083 30 45 60
90 - 106 100 GP0098 30 45 60
106 - 125 200 GP0116 35 55 70
125 - 150 200 GP0138 35 55 70
150 - 180 200 GP0165 35 55 70
 180 - 212 200 GP0196 35 55 70
212 - 250 200 GP0231 35 55 70
250 - 300 200 GP0275 30 45 60
300 - 355 200 GP0328 30 45 60
315 - 355 200 GP0335 45 70 90
350 - 400 200 GP0375 45 70 90
355 - 425 200 GP0390 30 45 60
425 - 500 200 GP0463 30 45 60
450 - 500 200 GP0475 45 70 90
500 - 560 200 GP0530 45 70 90
500 - 600 200 GP0550 30 45 60
560 - 600 200 GP0580 45 70 90
600 - 630 200 GP0615 45 70 90
600 - 710 200 GP0650 30 45 60
710 - 850 200 GP0780 30 45 60
850 - 1000 200 GP0925 30 45 60
1000 - 1180 400 GP1090 35 55 70
1120 - 1180 400 GP1150 55 85 110
1250 - 1400 400 GP1325 35 55 70
1400 - 1600 400 GP1500 55 85 110
1400 - 1700 400 GP1550 35 55 70
1600 - 1800 400 GP1700 55 85 110
1700 - 1800 400 GP1750 35 55 70
1800 - 2000 400 GP1900 55 85 110
2000 - 2400 400 GP2300 35 55 70
2300 - 2700 400 GP2500 35 55 70
2800 - 3200 400 GP3000 35 55 70
3360 - 3550 400 GP3455 35 55 70
3350 - 4000 400 GP3775 35 55 70

  * Currency conversions are provided as a guide only and are therefore subject to slight fluctuation

 

GLASS MICROSPHERE
TECHNICAL SPECIFICATION
(soda-lime glass)
  (Available to Download in the Library)
Chemical Composition
SiO2   74.00% +/- 0.20%
Na2O   11.90% +/- 0.05%
TiO2   0.04% +/- 0.002%
MgO   4.13% +/- 0.01%
Al2O3   0.98% +/- 0.02%
Fe2O3   0.08% +/- 0.002%
K2O   0.28% +/- 0.01%
CaO   8.15% +/- 0.01%
SO3   0.25% +/- 0.01%
B2O3   0.10% +/- 0.01%
Sb2O3, BaO, ZnO, PbO    <0.01% +/- 0.01%
Chemical analysis according to DIN 51001

Physical Properties

Specific Gravity
Refractive Index
Hardness Mohs
Rockwell
OPH 50g load
Knoop 100g load
Coefficient of fraction
Static
Dynamic

   2.43 - 2.49 g/cm3
1.51 - 1.52
6
47 RC
540 kj/mm2
517 kj/mm2

0.9 - 1.0
0.7 - 0.8

Mechanical Properties

Young Modules
Rigidity Modulus
Poissons ration

   6.89 x 104 N/mm2
2.96 x 104 N/mm2
0.21

Electrical Properties
Volume Resistivity at 50Hz
Dielectric Strength
Dielectric Constant (at 1KHz)
Power Factor		   300 G.Ohm-m
4500 kV/cm
7.6
0.9

Thermal Properties
Softening Point
Thermal Conductivity
Expansion of Co-efficient
(0-300ºC)
Specific Heat		   740ºC
1.05 W/mK

7.75 x 10-6/K
770 J/kgK

 

 

 

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