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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
20 - 30
2 Week Lead Time		 100 GP0025 100 120 160
32 - 45 100 GP0042 40 48 64
45 - 53 100 GP0049 40 48 64
63 - 75 100 GP0069 30 36 48
75 - 90 100 GP0083 30 36 48
90 - 106 100 GP0098 30 36 48
106 - 125 200 GP0116 35 42 56
125 - 150 200 GP0138 35 42 56
150 - 180 200 GP0165 35 42 56
 180 - 212 200 GP0196 35 42 56
212 - 250 200 GP0231 35 42 56
250 - 300 200 GP0275 30 36 48
300 - 355 200 GP0328 30 36 48
315 - 355 200 GP0335 45 54 72
350 - 400 200 GP0375 45 54 72
355 - 425 200 GP0390 30 36 48
425 - 500 200 GP0463 30 36 48
500 - 560 200 GP0530 45 54 72
500 - 600 200 GP0550 30 36 48
560 - 600 200 GP0580 45 54 72
600 - 630 200 GP0615 45 54 72
600 - 710 200 GP0650 30 36 48
710 - 850 200 GP0780 30 36 48
850 - 1000 200 GP0925 30 36 48
1000 - 1180 400 GP1090 35 42 56
1120 - 1180 400 GP1150 55 66 88
1250 - 1400 400 GP1325 35 42 56
1400 - 1600 400 GP1500 55 66 88
1600 - 1800 400 GP1700 55 66 88
1700 - 1800 400 GP1750 35 42 56
1800 - 2000 400 GP1900 55 66 88
2000 - 2400 400 GP2300 35 42 56
2300 - 2700 400 GP2500 35 42 56
2800 - 3200 400 GP3000 35 42 56
3360 - 3550 400 GP3455 35 42 56

  * 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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