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STANDARD
MATERIALS
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Medical |
Bearings |
Dispensing |
Imaging |
General Information
Hartford Technologies produces two types of Glass
balls: Soda Lime and Borosilicate for use in
typically very demanding applications. Primary
use is check valves for chemical, pharmaceutical,
food processing and fuel systems. They are
available in matte, polished or ground finishes.
Features of glass:
- Highly Corrosion Resistant
- Light Weight (1/3 of stainless steel)
- Manufactured to Tight Tolerances
- Non-magnetic
- Stable Material Cost |
Download
Glass Ball
Specifications
Flyer
 |
Soda Lime
Glass
Will not stand thermal shock; can mechanically give
continual service at 230 degrees F.; stands limited
static and torque load; good electric and corrosion
resistant properties.
Density
2.4 gm/cm Continuous Operating Temp. 230 Degrees F
Continuous Operating Temperature
230 Degrees F
Surface Finish
Ground - 20-30 RMS
Polished - 10-20 RMS
Sizes Available
1/16 through 1" in Ground, Polish, or Matte
Grades.
Borosilicate
8330
Material Characteristics
Will withstand high thermal shock; can
mechanically give continual service at 450 degrees
F. with extreme temperature limit at 900 degrees F.;
very high electrical resistivity and dielectric
strength; high chemical stability, and will
withstand high applied torque loads.
Density
2.2 gm/cm
Continuous Operating Temperature
450 Degrees F
Surface Finish
Ground - 20-30 RMS
Polished - 10-20 RMS
Sizes Available
1/16 through 1" in Ground, Polish, or Matte
Grades.
Physical Properties Comparison |
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Soda Lime
Glass |
|
Borosilicate
Glass |
| 1. Silica content (wt%) |
65 |
65-70 |
| 2. Oxides present |
Na20 |
B2O3 |
| 3. Sound Transmission Velocity
m/sec. Max (plane longitudinal wave) |
5600 |
5100 |
| 4. Thermal Shock Performance |
Poor |
Good |
| 5. Soften Temperature Point |
1100 F |
1300 F |
| 6. Mechanical Load Resistance |
65 |
65-70 |
| 7. Chemical Resistance |
65 |
65-70 |
| 8. Dielectric Constant at 100 Mhz
(20 C) |
65 |
65-70 |
| 9. Volume resistivity (350 C
megohm-cm) |
65 |
65-70 |
| Mechanical Properties |
Soda Lime
Glass |
Borosilicate
Glass |
| Specific Weight |
2.50 kg/ltr |
2.33 kg/ltr |
| Youngs-Module |
65 GPa |
64 GPa |
| Hardness (Mohrs scale) |
6 |
7 |
| Linear Thermal Expansion (20 - 300 °C) |
8.60 x 10(-6) K(1) |
3.25 x 10(-6) K(1) |
| Transformation Temperature |
515 °C |
530 °C |
| Tolerances |
Soda Lime
Glass |
Borosilicate
Glass |
| Standard Diameter Tolerance |
+/- 0.02 mm |
+/- 0.02mm |
| Standard Roundness/Sphericity |
≤ 0.02 mm |
≤ 0.02mm |
| Standard Surface Finish |
matte |
matte |
| Special Order Diameter Tolerance |
+/- 0.01 mm |
+/- 0.01 mm |
Special Order Roundness/Sphericity
Tolerance |
≤ 0.01 mm |
≤ 0.01 mm |
Chemical Resistance of Glass Balls
(Ball size: 2.5 mm) |
Soda Lime
Glass |
Borosilicate
Glass |
| Medium |
Concentration |
Temp |
Time |
Corrosion Rate |
| Hydrochloric Acid (HCI) |
20.4% |
102 °C |
6 hr |
0.002 g/m²/h |
0.001 g/m²/h |
| Nitric Acid (HNO3) |
30.0% |
102 °C |
6 hr |
0.012 g/m²/h |
0.010 g/m²/h |
| Oxalic Acid (H2C2O4) |
30% |
102 °C |
6 hr |
0.006 g/m²/h |
0.005 g/m²/h |
| Formic Acid (H2CO2) |
30% |
102 °C |
6 hr |
0.000 g/m²/h |
0.000 g/m²/h |
| Sodium Hydroxid (NaOH) |
30% |
102 °C |
6 hr |
1.200 g/m²/h |
1.000 g/m²/h |
| Deionized
Water (H20) |
100% |
102 °C |
6 hr |
0.005 g/m²/h |
0.002 g/m²/h |
| Precision
Glass Ball Weights |
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| Size |
Soda
Lime Glass |
Borosilicate Glass |
| Decimal |
MM |
Inch |
Pcs./kg |
Pcs./lb. |
Pcs./kg |
Pcs./lb. |
| 0.0315 |
0.800 |
1/32 |
1,492,070 |
676,792 |
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| 0.0394 |
1.000 |
|
763,940 |
346,517 |
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| 0.0625 |
1.588 |
1/16 |
190,769 |
86,531 |
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| 0.0937 |
2.381 |
3/32 |
56,590 |
25,669 |
63,440 |
28,776 |
| 0.0984 |
2.500 |
|
48,890 |
22,176 |
54,810 |
24,861 |
| 0.1181 |
3.000 |
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28,290 |
12,832 |
31,710 |
14,383 |
| 0.1250 |
3.175 |
1/8 |
23,860 |
10,823 |
26,750 |
12,134 |
| 0.1378 |
3.500 |
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17,810 |
8,078 |
19,970 |
9,058 |
| 0.1563 |
3.969 |
5/32 |
12,210 |
5,538 |
13,690 |
6,210 |
| 0.1875 |
4.762 |
3/16 |
7,070 |
3,207 |
7,930 |
3,597 |
| 0.1969 |
5.000 |
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6,110 |
2,771 |
6,850 |
3,107 |
| 0.2187 |
5.556 |
7/32 |
4,450 |
2,018 |
4,990 |
2,263 |
| 0.2500 |
6.350 |
1/4 |
2,980 |
1,352 |
3,340 |
1,515 |
| 0.2656 |
6.747 |
17/64 |
2,480 |
1,125 |
2,780 |
1,261 |
| 0.2756 |
7.000 |
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2,220 |
1,007 |
2,490 |
1,129 |
| 0.2813 |
7.144 |
9/32 |
2,090 |
948 |
2,340 |
1,061 |
| 0.3125 |
7.938 |
5/16 |
1,520 |
689 |
1,710 |
776 |
| 0.3150 |
8.000 |
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1,490 |
676 |
1,670 |
757 |
| 0.3437 |
8.731 |
11/32 |
1,140 |
517 |
1,280 |
581 |
| 0.3543 |
9.000 |
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1,040 |
472 |
1,170 |
531 |
| 0.3750 |
9.525 |
3/8 |
880 |
399 |
990 |
449 |
| 0.4063 |
10.319 |
13/32 |
690 |
313 |
770 |
349 |
| 0.4375 |
11.112 |
7/16 |
550 |
249 |
620 |
281 |
| 0.4687 |
11.906 |
15/32 |
450 |
204 |
500 |
227 |
| 0.4844 |
12.303 |
31/64 |
400 |
181 |
450 |
204 |
| 0.5000 |
12.700 |
1/2 |
370 |
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