New products-What's new inside the machine?
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Silicone 1C63: A dual cure silicone material specifically developed for electrical insulation applications UL recognized, one part material, designed for manual and automated dispensing systems Fast processing and eliminates shadow area concerns with secondary moisture cure
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The document describes two 1-part RTV silicone conformal coatings, 1C49LVF and 1C49HVF, designed to protect electronics from moisture and the environment. 1C49LVF has a viscosity of 500 cps and is UL recognized with a V-0 flammability rating and thermal index of 140°C. 1C49HVF has a higher viscosity of 34,000 cps and can withstand high temperatures. Both cure within 10 minutes and provide clear finishes for inspection. The coatings protect sensitive components, cure with ambient moisture, and offer benefits like ease of use and compatibility with automated dispensing systems. Surface cleanliness and proper coating thickness are important for avoiding problems during processing.
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The document describes silicone material 1C63, which is a dual-cure silicone designed for electrical insulation applications. It has a viscosity of 3500 +/- 1500 cps, cures with UV irradiation of 1-5 J/cm2 followed by a secondary moisture cure, and provides protection up to 250 mils thick with good elongation, tensile strength, and high volume resistivity. It is a one-part material that applies and cures easily for both manual and automated processes.
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Conformal Coating is applied to circuit cards to provide a dielectric layer on an electronic board. This layer functions as a membrane between the board and the environment. With this coating in place, the circuit card can withstand more moisture by increasing the surface resistance or surface insulation resistance (SIR). With a higher SIR board, the risk of problems such as cross talk, electrical leakage, intermittent signal losses, and shorting is reduced.
This reduction in moisture will also help to reduce metallic growth called dendrites and corrosion or oxidation. Conformal coating will also serve to shield a circuit card from dust, dirt and pollutants that can carry moisture and may be acidic or alkaline.
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The document describes two 1-part RTV silicone conformal coatings, 1C49LVF and 1C49HVF, designed to protect electronics from moisture and the environment. 1C49LVF has a viscosity of 500 cps and is UL recognized with a V-0 flammability rating and thermal index of 140°C. 1C49HVF has a higher viscosity of 34,000 cps and can withstand high temperatures. Both cure within 10 minutes and provide clear finishes for inspection. The coatings protect sensitive components, cure with ambient moisture, and offer benefits like ease of use and compatibility with automated dispensing systems. Surface cleanliness and proper coating thickness are important for avoiding problems during processing.
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The document describes silicone material 1C63, which is a dual-cure silicone designed for electrical insulation applications. It has a viscosity of 3500 +/- 1500 cps, cures with UV irradiation of 1-5 J/cm2 followed by a secondary moisture cure, and provides protection up to 250 mils thick with good elongation, tensile strength, and high volume resistivity. It is a one-part material that applies and cures easily for both manual and automated processes.
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How Conformal Coating Can Kill
Conformal Coating is applied to circuit cards to provide a dielectric layer on an electronic board. This layer functions as a membrane between the board and the environment. With this coating in place, the circuit card can withstand more moisture by increasing the surface resistance or surface insulation resistance (SIR). With a higher SIR board, the risk of problems such as cross talk, electrical leakage, intermittent signal losses, and shorting is reduced.
This reduction in moisture will also help to reduce metallic growth called dendrites and corrosion or oxidation. Conformal coating will also serve to shield a circuit card from dust, dirt and pollutants that can carry moisture and may be acidic or alkaline.
There are several types of conformal coating materials and the selection of one for your application must consider several variables. Silicones, polyurethanes, acrylics, epoxies and some of the newer hydrophilic materials offer many options to the user. However, the incorrect selection can result in huge problems with your CCA. For example, if you use silicone as your conformal coating material in a high sulfur environment, the silicone absorbs the sulfur and enhances the probability of silver migration on chip resistors and other forms of corrosion.
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1. **Synchronous TDM**: In synchronous TDM, time slots are pre-assigned to each signal, regardless of whether the signal has data to transmit or not. This can lead to inefficiencies if some time slots remain empty due to the absence of data.
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