Dow Silicones for Appliances

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Benefits of Silicones from Dow

  • Extensive product line
  • Proven application performance
  • Leading global technical service
  • A commitment to quality
  • Fully global supply capability
  • Continuing innovation

 

Silicone Adhesives and Sealants

Benefits of DOWSIL™ Silicone Adhesives and Sealants

 Wide Temperature Range

  • Many products can be used from -65ºC to 232ºC (when fully cured)

Extremely Weather-Resistant

  • Virtually unaffected by weather – including rain, sleet, snow, ultraviolet (UV) radiation, ozone and temperature extremes

Good Dielectric Properties

  • Good dielectric properties over wide thermal-cycling conditions

Good Bond Strength

  • Specially designed to provide good adhesion and bond strength to a variety of surfaces

Low Flammability

  • In fire conditions, DOWSIL™ silicone adhesives and sealants are reluctant to burn; in fact, some grades are exceptionally flame-retardant

Good Chemical Stability

  • Ideal for use in applications exposed to harsh environments

Environment

  • Dow is always striving to improve operations, working largely from the framework of the Responsible Care® Pollution Prevention Code

Benefits of DOWSIL™ Silicone Adhesives and Sealants

 

 

Application Example: Stovetop Sealing

Application Needs

  • Sealing frame to kitchen counter
  • Sealing/bonding glass (adhesive seal)

Material Requirements

  • Heat resistance
  • Hot water resistance
  • Good adhesion
  • Good tooling

Potential Product Solutions

  • Adhesive seal: DOWSIL™ 732 Multi-Purpose Sealant
  • DOWSIL™ EA-2626 Adhesive
  • SILASTIC™ Q3-3636 Adhesive
  • DOWSIL™ Q3-1566 Heat Resistant Adhesive/Sealant
  • Silicone Foams

Target Customers

  • Ceramic hob manufacturers

Stovetop Sealing

 

Application Example: Supermarket Display

Application Needs

  • Gap filling/bonding

Material Requirements

  • Good adhesion to various metals, plastics and glass
  • Water resistance
  • Flexible bond at low temperatures

Potential Product Solutions

  • DOWSIL™ 732 Multi-Purpose Sealant
  • DOWSIL™ 737 Neutral Cure Sealant
  • DOWSIL™ 7091 Adhesive Sealant
  • DOWSIL™ AS 7096N Sealant
  • DOWSIL™ HM-2600 Silicone Assembly Sealant

Target Customers

  • Industrial freezer display case manufacturers

Supermarket Display

 

Application Example: Commercial Kitchen Equipment

Application Needs

  • Adhesive seal
  • Gap filling/bonding

Material Requirements

  • Good adhesion to various metals, plastics and glass
  • Heat resistance
  • Fluid resistance (hot water, detergent)

Potential Product Solutions

  • DOWSIL™ 732 Multi-Purpose Sealant
  • DOWSIL™ 736 Heat Resistant Sealant
  • DOWSIL™ 733 Glass & Metal Sealant
  • DOWSIL™ Q3-1566 Heat Resistant Adhesive/Sealant
  • DOWSIL™ 7091 Adhesive Sealant

Target Customers

  • Kitchen equipment manufacturers

Commercial Kitchen

 

Application Example: Oven Door, Microwave Door

Application Needs

  • Bonding outer window to frame
  • Bonding inner window to frame

Material Requirements

  • Heat resistance (up to 250°C)
  • Good adhesion to glass
    • Good adhesion to painted metal

Potential Product Solutions

• DOWSIL™ 3-6096 Adhesive
• DOWSIL™ Q3-3526 Sealant
• DOWSIL™ 736 Heat Resistant Sealant
• DOWSIL™ 732 Multi-Purpose Sealant
• DOWSIL™ EA-2626 Adhesive
• SILASTIC™ Q3-3636 Adhesive

Oven Door

 

 

Application Example: Refrigerator

Application Needs

• Seam sealant for plastic/plastic or plastic/metal
• Bonding silicone rubber gasket to cover

Material Requirements

• Good adhesion to plastic and metal
• Good adhesion to silicone rubber
• Good adhesion/flexible bond at low temperatures

Potential Product Solutions

• DOWSIL™ 732 Multi-Purpose Sealant
• DOWSIL™ 737 Neutral Cure Sealant
• DOWSIL™ 748 Non-Corrosive Sealant
• DOWSIL™ 750 Plastic Surface Adhesive/Sealant
• DOWSIL™ 7091 Adhesive Sealant
• DOWSIL™ AS 7096N Sealant

Target Customers

• Refrigerator manufacturers

Refrigerator

 

Application Example: Washing Machine Cover

Application Needs

• Sealing and bonding
• Enhanced productivity

Material Requirements

• Good adhesion, developed quickly
• High green strength
• Clarity

Potential Product Solutions

• DOWSIL™ HM-2500 Assembly Sealant
• DOWSIL™ HM-2600 Silicone Assembly Sealant
• DOWSIL™ 7091 Adhesive Sealant
• DOWSIL™ EA-2626 Adhesive

Target Customers

• White-good manufacturers

Washing machine

 

 

Silicone Hot-Melt Adhesives

Benefits of DOWSIL™ Silicone Hot-Melt Adhesives

  • True family with members
    • Multipurpose with FDA & NSF
    • High-temperature stability
    • Flowable, self-leveling behavior
  • Durable adhesion to most substrates without primer
  • Enable productivity with fast green strength
    • Can ship parts quickly
  • Clear

 

Typical Properties of Silicone Hot-Melt Adhesives

hot-melt_Dow

These values are not intended for use in preparing specifications.
1 – 180º peel from various substrates based on ASTM C794: 21-day cure + 7-day H2O immersion.
2 – Shear Adhesion Failure Temperature based on ASTM 4498 but with a 0.10-in bondline.
3 – Industrial, Appliance and Maintenance.
4 – PCB and Systems Assembly.

 

Silicone Conformal Coatings

Overview: Conformal Coatings

Description and Use

  • Thin protective films/breathing membranes that filter water vapor and solid debris
  • Provide environmental and mechanical protection of circuitry and components
  • Used in thicknesses of 25 to 200 μm

Key Benefits of DOWSIL™ Conformal Coatings

  • Improve reliability in humid environments
  • Protect PCBs and other system components against environmental particles, moisture and contaminants, preventing short circuits and corrosion of conductors and solder joints
  • Protect circuits and components from abrasion and solvents
  • Stress-relieving
  • Protect insulation resistance
  • Reduce conductor spacing on PCBs
  • Offer good dielectric properties (insulation, moisture resistance, breakdown voltage)

 

Industry Trends for Conformal Coatings

Industry Trends for Conformal Coatings

 

Why Use Silicones?

WHy Use silicones_dow

 

Cure Profile Options for Conformal Coatings

Fast moisture-cure

  • Quick room-temperature cure
  • A “dispense-and-forget” solution; tack-free and ready for production in <10 minutes
  • Ideal option for high-volume assembly operations

Extended-working-time moisture-cure

  • Extended room-temperature cure to allow the material to flow farther over large or complex boards
  • Preferred solution for applications that require a thicker coating

Heat cure

  • “Command cure” materials provide control of cure rate
  • Material of choice when processing operations demand full cure in <5 minutes
  • May impose lower stress on board components during thermal cycling

 

Conformal Coatings Product Selection Tree

 

 

Silicone Thermally Conductive Materials

Industry Trends for Thermally Conductive Materials

Improved thermal management is increasingly critical
to maintaining long-term performance and reliability
of PCB module assembly in virtually every industry.

General Trends

  • High-functionality/high-performance appliances require higher power density, leading to increasing temperatures
  • Improved thermal management is required to dissipate heat in these devices for improved performance, reliability and lifetime
  • Improved thermal management also improves design flexibility
  • Form factor optimization is a key challenge – “thin is in”
  • Increasing demand for higher performance and more cost-effective thermal management solutions

 

Overview: Thermally Conductive Adhesives

Description

  • High-performance materials range from low-viscosity liquids to nonslump formulations
  • No significant by-products during processing, allowing use as structural adhesives without mechanical fasteners, even in complete confinement

Product Types

  • One-part moisture-cure grades offer simple room-temperature processing to minimize costs
  • One- or two-part heat-cure solutions help accelerate processing to speed time to market

Benefits

  • Strong bonds that dissipate heat
  • Expanded design and process flexibility
  • Enhanced design flexibility by filling oddly-shaped gaps and generating large contact areas to maximize heat transfer
  • Ease manufacturing challenges when part planarity and fit tolerances cannot be tightly controlled
  • Surface contact helps reduce interfacial resistance
  • After cure: Adhesive becomes a strong yet flexible elastomer; delivers good unprimed adhesion to a variety of common substrates, including metals, ceramics and filled plastics

 

Applications: Thermally Conductive Adhesives

Typical Applications

Bonding and sealing of hybrid circuit substrates, semiconductor components, heat spreaders and other applications that demand broad design, flexible processing options and excellent thermal management.

Applications_Thermally Conductive Adhesives

 

Overview: Thermally Conductive Compounds

Description

  • Serve as thermal bridges that draw heat away from a device’s sensitive PCB module components and dissipate it into the ambient environment
  • No-cure materials

Benefits

  • Low thermal resistance
  • High thermal conductivity
  • Ability to achieve very thin bond line thickness
  • Relatively low cost
  • Easy application onto heat sinks via screen printing; ease of rework
  • Maintain consistency at high temperatures to form positive seals with heat sinks, ensuring reliable device performance
  • Particularly suitable for applications in which heat sinks are removed and reattached later, or where the PCB module assembly favors no-cure processes

 

Applications: Thermally Conductive Compounds

Typical Applications
Sensitive PCB module components, LED lighting application, Power application such as IGBT module, telecom equipment, consumer electronics, power supplies and power components for transportation, etc.

Applications_Thermally Conductive Compounds

 

Overview: Thermally Conductive Elastomers & Gels

Description

• Adaptable products for encapsulation and potting applications
• Broad family of material technologies offers versatile thermal management solutions
• Available in a range of hardness and stress relief levels

Benefits

• Low viscosity before cure of these products enables easy processing; fully embed tall components, delicate wires and solder joints
• Particularly suitable for managing high heat in complicated PCB architectures
• Extremely low modulus after cure; provides superb stress-relief

 

Applications: Thermally Conductive Elastomers & Gels

Typical Applications
PCB system architectures, Potting of high-voltage transformers and sensors; assembly of substrates to heat sinks; gap fill material between heat sources and heat sinks Potting for: On-board charger, Inverter, Converter, Transformer, etc.

Applications_Thermally Conductive Elastomers & Gels

 

Thermally Conductive Materials Product Summary

Thermally Conductive Materials Product Summary

 

Thermally Conductive Materials Product Summary2

 

Thermally Conductive Materials Product Summary3

 

Silicone Foams (FIPFG)

Uses of Silicone Foams (FIPFG)

Ideal for use when:

  • A compression gasket is required
  • An “environmental seal” is required (sealing against ambient air, splashed water, dust, moisture)
  • A cost-effective sealing solution is required (compared to preformed gaskets/foam tapes)
  • High-tolerance gaps exist
  • Low sealing force/low modulus is required
  • Component sound and vibration require damping
  • Gasket installation demands automation (robotic dispensing)
  • Serviceability is an issue
  • Installation at tier supplier is preferred
  • Fast cure (room temperature/low heat) is demanded

 

Typical Applications of Silicone Foams

  • Back caps for headlamps/taillights
  • Headlamps/taillights/brake lights
  • Housings for PCB system assemblies
  • Timing belt covers
  • Plastic covers under the hood (“beauty covers”)
  • Door modules
  • Almost anywhere foam tape is used
  • Ceramic hobs and supporting metal frames
  • Dishwasher detergent dispenser units
  • Outdoor lighting
  • Gas boilers

Typical Applications of Silicone Foams

 

Processing of Silicone Foams

  • A two-part silicone RTV foam is directly dispensed onto the part surface to be sealed
  • Once the components are mixed, a foaming agent (H2) is formed
  • The dispensed foam gasket expands in its liquid stage and cures to a foamed solid (elastomer) within 10 minutes at room temperature
  • Provides a low-modulus integrated compression seal with fine cell-structure

Processing of Silicone Foams

 

Flowability of Silicone Foams

Difference between flowable and reduced-flow foams:

Flowability of Silicone Foams

 

Typical Properties of Silicone Foams

Typical properties of silicone foams

 

Source: Dow Technical Library

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If you have any questions or want to find out more about the possibilities for your industrial application, please complete the contact form and one of our experts will be in touch.

If you have a problem with industrial adhesives, sealants, lubricants or electronic protection products and require advice, you can contact our technical support service. Our team can help you to optimize your processes and applications.

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