SiLibeads Glass Beads (S, M, SL)

German-made glass beads in types S, M and SL, for grinding and dispersing. Features:

- finely graded bead sizes      - smooth surface

- high density      - high resistance to breakage

Type S glass beads

Made by continuous melting, cut and surface-polished, then heat-treated for extra hardness. Used for grinding and dispersing pigments, paints, inks, agrochemicals, pharmaceuticals, minerals and magnetic coatings.

Chemical composition

SiO2    72.5%    MgO  4.22%    Na2O    13%

Al2O3    0.58%    CaO    9.06%    lead oxide: <0.01%

Physical properties

Mohs hardness ≥ 6    modulus of elasticity: 63 GPa    specific gravity: 2.5 kg/dm3

No.        size mm        bulk density kg/dm3

4501        0.25-0.50

45015        0.40-0.60

4502        0.50-0.75

4503        0.75-1.00

4504        1.00-1.30

4505        1.25-1.65

4506        1.55-1.85

4507        1.70-2.10

4508        2.00-2.40

4510        2.40-2.90

4511        2.85-3.45

4512        3.40-4.00

4513        3.80-4.40

Type M glass beads

1.5 mm diameter and above, mechanically pressed, with especially precise geometry.

Used as grinding media in bead mills for pigments, paints, agrochemicals and minerals; as polishing media in the optical industry; as mixing media in the chemical industry and agitators in aerosols; and for treating metal, wood and polymer surfaces.

Chemical composition

SiO2    66.7%    Na2O    14.00%    CaO    7.59%

Al2O3    3.46%    B2O3    2.90%    other    5.35%

Physical properties

Mohs hardness: >6    modulus of elasticity: 63 GPa

Specific gravity: 2.5 kg/dm3    bulk density: 1.5 kg/dm3

No.        diameter mm        tolerance

5002        1.5        ±0.2

5003        2.0        ±0.2

5004        2.5        ±0.2

5005        3.0        ±0.2

5006        3.5        ±0.2

5009        4.0        ±0.2

5010        4.5        ±0.2

5011        5.0        ±0.2

5012        6.0        ±0.2

5013        7.0        ±0.2

5014        8.0        ±0.2

5015        9.0        ±0.2

Type SL glass beads

Made by continuous melting, for products with special grinding requirements such as magnetic coatings, anti-corrosion coatings, pH-sensitive suspensions and thermal paper coatings.

Advantages

- 30% less wear than conventional glass beads

- alkali content below 1.5%, keeping pH stable during grinding

- ideal for grinding audio and video tape coatings

Chemical composition

SiO2    53.50%    CaO    20.10%    Al2O3    14.80%

B2O3    8.11%    MgO    2.33%    other    1.16%

Physical properties

Mohs hardness: >6    modulus of elasticity: 77 GPa    specific gravity: 2.59 kg/dm3

No.        diameter mm        bulk density kg/dm3

7502        0.50-0.75        1.55

7503        0.75-1.00        1.54

7504        1.00-1.40        1.53

7505        1.30-1.70        1.53

7507        1.70-2.10        1.53

7508        2.00-2.50        1.53

7510        2.50-3.00        1.53

7511        2.80-3.40        1.52

7512        3.30-3.90        1.51

7513        3.90-4.40        1.50

Specific gravity: 2.5 kg/dm3    bulk density: 1.5 kg/dm3