When two surface rub against each other, electrostatic charges are developed. Electrostatic voltages due to this rubbing can give rise to voltages from 100V to 35000V. Often rubbing is not necessary to generate static electricity. Even walking across the floor, standing up from a chair, removing sensitive components from plastic envelopes or movement of ICs inside DIP sticks can generate static electricity. Table 1 shows typical voltages generated by simple activities.
As the time duration of these voltages is of the order of few microseconds they do not affect human beings. They can damage or degrade sensitive electronic components. This results in malfunctioning of the equipment in which the damaged components is used.
Antistatic Conductive Floor Coat provided is the best solution to this problem of static electricity. It is a specially formulated coating material which is applied on the floor, tabletops, cupboards etc. on which Electrostatic Discharge Sensitive Devices ( E.S.D ) are manufactured or used. All electrostatic charges are harmlessly conducted away through the coating thus protecting the devices. Besides this its anti static properties reduces the build up of electrostatic charges on its surface.
In addition to its excellent antistatic and conductive properties antistatic Conductive Floor Coat has superb abrasion resistance. It has good resistance to oils, mild acids, alkalis and chemicals. It provides an attractive, long lasting waterproof surface which can be easily cleaned and maintained as it does not attract dust.
Typical Electrical Voltages due to turboelectric effect
| 10 to 20 % R.H (Volts) | 65 to 90 % R.H (Volts) | |
|---|---|---|
| Walking across carpet | 35,000 | 1,500 |
| Walking over vinyl flooring | 1,2000 | 250 |
| Worker at bench | 6,000 | 100 |
| Common Polyethylene bag picked from bench | 20,000 | 1,200 |
Physical Properties
| Description | Liquid System |
|---|---|
| Tensile strength ( kg/sq cm ) | 130 |
| Elongation (%) | 65 |
| Tear strength (kg/cm) | 8 |
| Hardness shore A | 80 +/- 5 |
| Specific Gravity | 1 +/- 0.05 |
| Abrasion Resistance (grms/1000 cycles) | 0.01 |
| Dimensional Stability (%) | 0.1 |
Electrical Properties
| Electrical Resistance As per BS 2050 : 1978 |
5 x 104 to 109 ohms-cm |
|---|---|
| Antistatic charge with 2 KV/ metre reading |
Approx 300 V |
Method 0f Application
- Mild Steel Surface
- The Antistatic Conductive Floor Coat System consists of 3 chemical components. Three coats should be applied using mixtures of these components.
- Before application, the under-surface should be leveled and free of dust and oil
- Freshly prepared concrete floors should be cleaned with 10% hydrochloric acid followed by thorough washing with water
- The floor should be allowed to dry completely
- Cracks and small holes should be filled up with a thin paste made by adding fillers such as silica. For a smooth finish, this paste can be applied on the entire floor
- Application is carried out by means of a brush or spray gun
- The first coat consists of a primer
- The material should be applied evenly and formation of puddles should be avoided as this may give rise to blisters
- Then second and third coats are applied
- A gap of 5 to 6 hours is required between the second and third coat
- The floor can be used for walking within 24 hours after the third coat
- Heavy objects can be moved on the floor after 4 to 5 days