Momentive Performance Materials



  ECC4865
 

Silicone Conformal Coating
Product Description 

ECC4865 is a one component, solventless silicone thermal cure silicone conformal coating. This low viscosity product is easily applied via flow coating, brushing, spraying or dipping and has been found to provide outstanding moisture and environmental protection for printed circuit boards and other electronic assemblies.
Key Performance Properties 
  • Solventless, low VOC formulation
  • Extremely long coating bath life
  • Outstanding long-term viscosity stability
  • Very fast thermal cure mechanism
  • Primerless adhesion to many substrates
  • Excellent high/low temperature performance
    • Typical Product Data 

    Uncured Mixed Properties

    Property

    Value

    Specific Gravity @25°C

    0.98

    Viscosity @ 25C, cps

    210

    Color

    clear

    Flash Point, C

    > 125

    Cured Film Properties

    Property

    Units

    Value

    Durometer Hardness

    Shore A

    35

    Dielectric Strength

    volts / mil

    500

    Dielectric Constant

    		  

    2.4

    Dissipation Factor

    		  

    0.01

    Volume Resistivity

    ohm-cm

    5E14

    Operating Temperature Range (continuous)

    		  

    -40C to +200C

    Fungus Resistance (ASTM G21)

    		  

    Excellent

    Chemical Resistance

    		  

    Very Good
    Specifications 

    Typical product data values should not be used as specifications. Assistance and specifications are available by contacting Momentive Performance Materials.
    Instructions for Use 
    		 Surface Preparation

    The cleanliness of the circuit board substrate is critical to successful application of the conformal coating and its long-term performance. Surfaces must be free of moisture, dirt, wax, grease and other contaminants. Failure to remove contamination can lead to long-term failure of the circuit assembly.

    Solder Flux

    Solder flux residues on the surface of a printed circuit board can greatly impact the performance of a conformal coating by interfering with coating adhesion and possibly interfering with the coating’s cure mechanism. This is of particular concern when using 'no-clean' flux systems. Careful compatibility testing, with the flux system to be used, is strongly recommended.

    Compatibility

    Certain materials such as butyl and chlorinated rubber, sulfur containing materials, amines and certain metal soap-cured RTV silicone rubber compounds can cause cure inhibition. Cure inhibition is characterized by a lack of cure of the liquid silicone coating at the interface between it and the substrate being coated. Compatibility tests are strongly recommended.

    Application Method

    ECC4865 can be applied by dipping, spraying, flow coating, or brushing. When dip coating, a controlled dip insertion and withdrawal rate of between 2 - 6 inches per minute will typically yield a 3 - 5 mil average coating thickness per side. Spray coating should be done in an enclosed and ventilated area.

    Curing

    ECC4865 is designed to be thermal cured. The minimum cure temperature is 105C. The maximum cure temperature is 175C. Curing should be done in a ventilated oven. Actual cure time at a given temperature for a given part is dependent upon a variety of factors, including heat sink characteristics of the part being coated, type of oven (i.e. convection, IR, etc.), and oven loading factors. For more detailed information of the curing properties of ECC4865, contact Momentive Performance Materials Technical Service.
    Handling and Safety 

    Material Safety Data Sheets are available upon request from Momentive Performance Materials. Similar information for solvents and other chemicals used with Momentive Performance Materials Products should be obtained from your suppliers. When solvents are used, proper safety precautions must be observed.
    Storage and Warranty Period 

    The warranty period for ECC4865 silicone conformal coating is 6 months from date of shipment if stored in the original unopened container at temperatures of 25C (77F) or below.
    Availability 

    ECC4865 silicone conformal coating may be ordered from Momentive Performance Materials, Waterford, NY 12188, or the Momentive Performance Materials' sales office nearest you.
    Government Requirement 

    Prior to considering use of a Momentive Performance Materials product in fulfilling any Government requirement, please contact the Government and Trade Compliance office at 413-448-4624.

    CDS5545
     
     

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    Each user bears the full responsibility for making its own determination as to the suitability of Supplier’s materials, products, services, recommendations or advice for its own particular purpose. Each user must identify and perform tests and analyses sufficient to assure it that its finished parts will be safe and suitable for use under end-use conditions. Because actual use of products by the user is beyond the control of Supplier, such use is within the exclusive responsibility of the user, and Supplier cannot be held responsible for any loss incurred through incorrect or faulty use of the products. Further, no statement contained herein concerning a possible or suggested use of any material, product, service or design is intended or should be construed to grant any license under any patent or other intellectual property right of Supplier or any of its subsidiaries or affiliated companies, or as a recommendation for the use of such material, product, service or design in the infringement of any patent or other intellectual property right.