Silicones, silicone oils, sprays
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At a Glance: Which Potting Compound for Electronics?
Silicone, epoxy, and polyurethane (PU) are among the materials suitable for encapsulating electronic components. The appropriate formulation depends on the assembly, its temperature range, mechanical stress, contact with moisture or chemicals, and the manufacturing process. A single material class does not guarantee a specific degree of protection or suitability for a particular component. The manufacturer's current data sheet and application testing are crucial.
View our range of potting compounds or request a quote for electronics potting. Please specify the assembly, desired quantity, temperature range, and any special requirements. This will allow us to check for a specific product, including its datasheet and availability.
What is electronic potting?
In potting, a flowable compound is introduced into or around an electronic assembly and then hardened. It can fix components in place and protect them from environmental influences. The effectiveness of this process depends on the material, housing, processing, and testing of the finished assembly. Henkel describes liquid potting as a method for encasing complete electronic assemblies and distinguishes it from thin protective coatings. Henkel: Protective materials for electronics.
Full potting or protective coating?
In full encapsulation, material is introduced into the designated space of the assembly. A protective coating, on the other hand, applies a thin layer to selected surfaces. Both processes have different requirements regarding housing, accessibility, repair, and manufacturing. A product name or material class does not replace testing the protective effect of the finished assembly. Henkel explains the processes in a comparison.
- Full potting: Check the filling space, component geometry, heat path, dosage and the desired post-processing.
- Coating: Check which areas need to be covered and which contacts or test points should remain uncovered.
Silicone, epoxy or PU: The selection criteria
The following trends can help narrow down the options. They are not a guarantee for a specific product. Properties and approvals must be checked for the specific formulation in the manufacturer's data sheet.
Silicone potting compounds
They are tested for, among other things, sensitive components, movements, and demanding temperature profiles. For each specific product, adhesion, curing, electrical or optical properties, and processing are crucial.
Epoxy Potting Compounds
They are tested, among other things, when mechanical strength and dimensional stability are important. Stresses within the assembly, temperature profile, and potential future repairs must be taken into account.
PU potting compound
They are tested, among other things, when flexibility and mechanical protection are required together. Media contact, processing, and the permissible temperature range must be checked for the specific formulation.
A Henkel guide to thermal potting compares these material classes as a starting point for selection. The trends described therein expressly do not replace testing the specific formulation and assembly. Elkem showcases silicone solutions for electronics potting, including RTV systems for various applications.
Thermally conductive potting compound: More than one λ value
When an assembly needs to dissipate heat, the λ-value of a material alone is insufficient for selection. Component geometry, layer thickness, contact surfaces, and processing all influence the heat path. For product comparison, the required thermal conductivity, electrical insulation, processing, and operating temperature are considered together. The Henkel guideline addresses these points as part of the design process. Source: Thermal Potting for EV Components.
When requesting thermally conductive potting compound, please provide us with the power dissipation, available geometry, and permissible component temperature, if known. We will then review relevant manufacturer documentation and potential products. We can discuss the technical selection.
This turns a question about materials into a verifiable offer
The following information will help us provide a reliable recommendation or offer:
- Assembly and place of use: What is being potted, and under what conditions is the assembly being used?
- Temperature and media: What operating and processing temperatures, as well as contact with moisture or chemicals, can be expected?
- Electrical and thermal requirements: Is insulation, heat dissipation, or a specific optical property required?
- Manufacturing: What geometry, potting quantity, dosing method and curing conditions are planned?
- Procurement: What test quantity, subsequent production quantity, and deadline are required?
If you already have a product name and are looking for an alternative, please also send the current datasheet or article number. An alternative can only be evaluated after comparing the requirements and conducting a suitable application test. Request potting compound and a quote.
Frequently asked questions about electronic potting
Which potting compound is suitable for LED modules?
This depends, among other things, on optical requirements, heat generation, housing, and operating environment. Elkem specifies optically clear silicone formulations for certain LED applications. Whether a particular product is suitable can be determined from its datasheet and a test with the assembly. Elkem: Electronic potting.
Is a potted assembly automatically protected against water?
No. The level of protection also depends on the housing, connections, workmanship, and testing of the entire assembly. A specific degree of protection cannot be derived from the material class alone.
Can a potted assembly be repaired?
The possibility of rework depends on the material, geometry, and component. Henkel often describes liquid potting as a permanent solution that is difficult to rework. Clarify repair requirements before selecting the material. Henkel: Protective materials for electronics.
Can SILITECH replace another product?
We can examine a possible alternative based on the original datasheet and your application. Chemical family, processing, electrical and mechanical properties, and approvals must match. A blanket equivalence is not guaranteed.
What are the minimum order quantities and delivery times?
That depends on the specific product and current stock or supplier offer. Inquire about the required test quantity or production run. We will clarify packaging, price, and delivery date on a case-by-case basis.
Products and advice
We offer a range of electrical potting resins and encapsulating compounds. For applications with special requirements, please use our electronics potting quotation form. Specify your requirements and the desired test quantity. This will facilitate selection based on current manufacturer data sheets.
Further topics: Potting and encapsulation, thermal conductivity in potting and protective coatings for printed circuit boards.