One component, electrically conductive sodium silicate, aqueous based coating system
- Very good shielding effectiveness
- Silver coated nickel filler
- Offers cost effectiveness
- Temperature resistance up to +700°F
- Easy application
Master Bond MB600SCN is an aqueous based, sodium silicate system with a silver coated nickel filler. It is intended for use in applications where very good shielding effectiveness is required and cost considerations might be more pronounced. Electromagnetic interference (EMI) and radio frequency interference (RFI) are very important factors in electronic applications. The energy emitted from various sources such as radios, appliances, etc. can interfere with other electronic devices that are made from plastics. Conductive coatings are often applied to the housings in order to protect the devices from these types of interferences.
Shielding effectiveness is most often measured by attenuation. It is defined as the difference of an incoming intensity of the source and its decrease after it passes through the coating. The actual unit of measurement is in decibels (dB). It should be noted that this scale is logarithmic and a difference of 10 dBs indicates ten times the shielding effectiveness (e.g. 40 dBs is ten times as effective as 30 dBs). In general, an effectiveness of 10-30 dBs is considered to be somewhat low, but effective in many applications. Between 60-90 dBs is high and 90-120 dBs is exceptional. With the MB600SCN, the test method is based on IEEE 299, 2006 and aluminum is the reference for this test, which was performed at room temperature. Through most of the region between 1-2 gigahertz (GHz), the shielding effectiviness is a peak of 75 with a very short trough of about 40 dBs at 2 GHz. At 2 GHz, it sharply increases to almost 60 dBs, whereupon it gradually diminishes to 40 dBs at 4 GHz. Between 4-18 GHz, there is relatively minor variation with the dB level being about 45-50 up until 18 GHz. This information is contained in Figure 1, below. The service temperature range is also very special, ranging from 0°F to +700°F. The combination of shielding effectiveness and temperature resistance is outstanding.
Aside from its excellent performance profile, the handling is simple and safe. It is easy to brush on, and being water based, the system is relatively non-toxic. It should be noted that it is possible to spray this system as well, with the proper equipment. If sprayed on, the shielding effectiveness would be even greater than the values given above. MB600SCN will cure at room temperature in 24-48 hours or in 1-2 hours at 80°C. If curing with heat, it is advisable to ramp up the temperature over a 15-30 minute interval to prevent any possible blistering of the material. MB600SCN can be used in a wide variety of aerospace and electronic applications where a combination of robust shielding effectiveness and cost issues are important.
- Water based system, relatively non-toxic
- Superlative temperature resistance
- Impressive shielding effectiveness
- Bonds well to a wide variety of substrates
- Highly effective moisture barrier
- Easily applied by brushing
MB600SCN is available is various sizes and units to accommodate customer's needs.