As artificial intelligence and high-density computing increase the amount of power consumed inside data centers, conventional air cooling is becoming less practical for the highest-performance equipment. Manufacturers are responding with direct-to-chip liquid cooling, coolant distribution units, rack manifolds, pumps, valves, quick disconnects, sensors, and other fluid-handling components.
These systems create an important materials challenge: components must withstand warm coolant, pressure, electrical exposure, thermal cycling, and long service lives without leaking. As a result, manufacturers are evaluating high-performance thermoplastics such as polyphenylene sulfide (PPS) and polyether ether ketone (PEEK).
However, selecting the material is only part of the engineering decision. Multi-piece molded components must also be assembled with a joining process capable of producing strong, reliable, and potentially hermetic seals.
Emabond plastic welding offers a practical solution for joining filled PPS, PEEK, and other high-performance thermoplastics used in data-center liquid cooling, power distribution, and electrical infrastructure.
Why Are PPS and PEEK Being Used in Data Centers?
PPS and PEEK are high-performance, semi-crystalline thermoplastics. Depending on the exact grade and formulation, these materials may provide:
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- High continuous-use temperatures
- Excellent chemical and hydrolysis resistance
- Strong dimensional stability
- Low moisture absorption
- Electrical insulation
- Flame resistance
- Resistance to creep under sustained loads
- Compatibility with glass-fiber and mineral reinforcement
- The ability to replace certain metal or thermoset components
These properties are relevant because data-center cooling and power-distribution components may experience heat, pressure, glycol-water mixtures, dielectric fluids, cleaning chemicals, electrical current, and repeated temperature changes.
Material suppliers are developing PPS compounds for pumps, valves, pipe fittings, busbars, connectors, electric motors, thermal-management systems, and hybrid metal-plastic components. These same component categories are becoming increasingly important within liquid-cooled and higher-voltage data-center infrastructure.
What Data Center Components Can Be Manufactured from PPS or PEEK?
Potential PPS and PEEK applications within data-center cooling and power infrastructure include:
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- Coolant distribution manifolds
- Rack-level manifolds
- Pump bodies and covers
- Valve and solenoid-valve housings
- Coolant reservoirs
- Flow-meter and filter housings
- Quick-disconnect bodies
- Pipe fittings and junctions
- Leak-detection sensor housings
- Busbar carriers and insulating covers
- Electrical connector housings
- Terminal blocks
- Power-distribution enclosures
- Housings containing molded-in metal inserts
- Components surrounding sensors, circuit boards, or monitoring electronics
Not every component requires PEEK. PPS is generally the more economical choice when its temperature, chemical, mechanical, and electrical properties satisfy the application.
PEEK becomes more attractive when an application requires exceptional temperature capability, chemical resistance, mechanical performance, purity, or long-term reliability under extreme conditions. The final material selection must be based on the actual coolant, pressure, temperature, electrical requirements, reinforcement, and expected service life.
Why Are Liquid-Cooling Manifolds Difficult to Join?
A molded liquid-cooling manifold may contain numerous internal channels within two or more molded sections. After molding, these sections must be joined without blocking the channels or creating leak paths.
The joining process may need to provide:
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- A continuous hermetic seal
- Consistent heating around a long weld path
- Sealing around multiple internal flow channels
- Uniform strength despite molded-part warpage
- Minimal particulate generation
- Minimal stress on embedded electronics
- Resistance to pressure and thermal cycling
- Compatibility with glass-filled or mineral-filled materials
- Controlled flash that does not enter the fluid path
- Repeatable production data and leak performance
Large manifolds can also have irregular or three-dimensional weld paths that are difficult to access with a conventional flat welding tool. These requirements make the joining method an important part of the original component design—not a decision that should be delayed until the molded parts are complete.
Why Can Glass-Filled PPS Be Difficult to Weld?
PPS is frequently reinforced with glass fiber to improve stiffness, strength, dimensional stability, and resistance to thermal expansion. Grades containing 30% or 40% glass fiber are commonly considered for demanding electrical, automotive, pump, valve, and fluid-handling applications.
The reinforcement improves the molded component, but it can make welding more difficult. As glass-fiber content increases:
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- Less thermoplastic resin is available at the joint interface.
- The melt may flow less easily.
- Fiber orientation may differ between the molded components.
- Knit lines can create localized weak areas.
- Molded surfaces may not melt or collapse uniformly.
- The two components may contain different filler percentages.
- Process windows for conventional welding methods may become narrower.
Even two components described as “PPS GF40” may not be identical. Different grades can use different fiber sizing, impact modifiers, flame retardants, lubricants, pigments, and stabilizers. Welding qualification should therefore be based on the complete material designation—not only the general polymer family.
These challenges are not limited to PPS. Learn more about welding engineered thermoplastics and filled plastic materials, including PPS, PEEK, nylon, POM, and other difficult-to-join polymers.
Can Ultrasonic Welding Join PPS and PEEK?
Ultrasonic welding can join some relatively small PPS and PEEK components when the material, joint design, horn access, and part geometry are appropriate.
However, ultrasonic welding can become more difficult when an application involves:
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- Large components
- Long or irregular sealing paths
- Multiple internal channels
- Remote joints located far from the horn
- High glass-fiber or mineral content
- Different formulations on opposite sides of the joint
- Sensitive circuit boards, sensors, or internal components
- Strict cosmetic requirements
- Part geometry that cannot be supported directly beneath the horn
Ultrasonic welding introduces mechanical vibration through the molded component. Energy must travel from the horn to the joint, making part stiffness, geometry, support, and distance from the horn important process variables.
For a large PPS cooling manifold with several internal channels, it may be difficult to deliver consistent ultrasonic energy around the complete weld path.
Why Not Use Adhesives, Bolts, or Gaskets?
Adhesives can join different materials and complex shapes, but they introduce additional process requirements that may include:
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- Surface cleaning or plasma treatment
- Metering and mixing control
- Cure time
- Environmental controls
- Shelf-life management
- Adhesive squeeze-out
- Inspection of the complete bond line
- Chemical compatibility with the coolant
- Long-term aging and thermal-cycle validation
Bolts and gaskets provide serviceability but add components, labor, holes, concentrated loads, and potential leak paths. Plastic creep can also reduce gasket compression over time, particularly when a component operates at elevated temperature.
For permanent data-center fluid components, a welded thermoplastic enclosure may reduce component count and eliminate dependence on a separate adhesive or elastomeric seal.
How Does Emabond Weld Filled PPS and PEEK?
Emabond is an electromagnetic plastic-welding process. A specially formulated thermoplastic weld material containing electromagnetic susceptor particles is positioned between the molded components.
The assembly is placed inside a fixture containing an electromagnetic work coil. When the RF generator is activated, the susceptor heats directly within the joint. The surrounding thermoplastic weld material and adjacent surfaces melt under controlled pressure. The joint is then allowed to cool while pressure is maintained.
Because heat is generated at the joint, Emabond does not need to transmit mechanical vibration through the complete component or bring a hot plate into contact with both molded surfaces.
This allows Emabond to weld along:
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- Large perimeters
- Long continuous seams
- Multiple internal flow paths
- Irregular joint shapes
- Three-dimensional weld paths
- Joints located around sensitive internal components
The Emabond weld material can also be formulated for the polymers being joined. This is particularly important for PPS, PEEK, and other highly engineered thermoplastics.
What Advantages Does Emabond Offer for Data Center Cooling Manifolds?
Continuous Hermetic Sealing
The weld material can follow the perimeter of a manifold and individual internal channels, allowing multiple continuous seals to be created during the same welding cycle.
Compatibility with Filled Materials
Emabond can be developed for glass-filled, mineral-filled, or otherwise reinforced thermoplastics that may be difficult or impossible for conventional plastic-welding processes.
Dissimilar-Grade Joining
Two components may belong to the same polymer family while containing different fillers or additives. For example, one component may be PPS GF40 while the other uses an impact-modified or electrically optimized PPS grade.
Emabond can often accommodate these formulation differences because the weld material acts as a compatible intermediary at the joint. Every specific combination still requires testing.
No Mechanical Vibration
The process does not depend on high-frequency mechanical vibration. This can benefit assemblies containing sensors, circuit boards, metal inserts, delicate flow-control components, or other internal hardware.
Complex Weld-Path Capability
The electromagnetic field can follow a work coil designed around the actual joint. The process is not limited to a single flat horn-contact area.
Controlled Joint Heating
Heat is concentrated at the weld interface instead of broadly heating the complete assembly. This can reduce the exposure of internal components to unnecessary heat.
Potential Adhesive and Gasket Replacement
A permanent welded enclosure can reduce consumable materials, fastening hardware, cure time, and potential leak paths.
Can Emabond Join PPS to PEEK?
PPS and PEEK have different melting temperatures, crystallization behavior, and chemical structures. They should not automatically be considered directly compatible simply because both are high-performance thermoplastics.
However, Emabond can formulate an intermediary weld material and control heat at the joint. This creates possibilities for joining thermoplastics or formulations that are difficult to join through direct melt fusion alone.
PPS-to-PEEK feasibility depends on:
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- The exact material grades
- Filler and reinforcement content
- Joint temperature
- Melt compatibility
- Required structural strength
- Coolant and chemical exposure
- Pressure and leak requirements
- Thermal-cycle conditions
- Joint geometry
A feasibility study and application-specific testing would be required before selecting the process for production.
What Information Is Needed to Evaluate a PPS or PEEK Manifold?
A preliminary Emabond application review should include:
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- Complete resin manufacturer and grade number
- Filler or reinforcement percentage
- Coolant composition
- Operating and maximum temperatures
- Internal pressure and proof-pressure requirements
- Required leak rate or IP rating
- Expected thermal cycles
- Joint length and geometry
- Available space surrounding the joint
- Location of metal inserts and electronics
- Expected annual production volume
- Required cycle time
- Applicable flame, electrical, or regulatory standards
Whenever possible, testing should use production-intent molded components. Flat plaques can establish basic material compatibility, but they do not reproduce actual knit lines, fiber orientation, warpage, joint tolerances, or fixture requirements.
Is Emabond Limited to Data Center Applications?
No. The same PPS and PEEK welding capabilities can apply to other industries using high-temperature, chemically resistant, or highly filled thermoplastic components.
Relevant applications include:
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- Automotive and electric-vehicle thermal management
- Battery and power-electronics housings
- Pumps and valves
- Water-treatment equipment
- Semiconductor manufacturing equipment
- Chemical-processing systems
- Medical and laboratory equipment
- Aerospace fluid-handling components
- Industrial sensors and controls
- Fuel-cell, flow-battery, and long-duration energy-storage components
- Electrical and electronic enclosures
The common requirement is not the industry itself. It is the need to create a reliable structural or hermetic joint in a demanding thermoplastic assembly.
What Is the Best Joining Method for a PPS Data Center Manifold?
There is no universal answer. The best process depends on component size, geometry, resin grade, filler content, pressure, coolant, production volume, and required leak performance. However, Emabond technology is a great options to consider along side any traditional plastic joining method.
Ultrasonic welding may work well for small, accessible components. Hot-plate welding may work for flat, uncomplicated joints. Laser welding may be suitable when the materials provide the necessary optical properties and the molded surfaces maintain tight contact. Adhesives and gaskets may be appropriate when serviceability or low initial volume is the priority.
Emabond becomes especially valuable when an application combines several difficult requirements:
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- Glass-filled PPS or PEEK
- A large or irregular manifold
- Multiple internal coolant channels
- A continuous hermetic seal
- Different material grades
- Sensitive internal electronics
- Limited tolerance for vibration
- A desire to eliminate adhesives or gaskets
Evaluating Emabond for PPS and PEEK Components
The growth of liquid-cooled computing and higher-voltage data-center infrastructure is creating new requirements for pumps, valves, fittings, manifolds, connectors, busbars, and electrical housings.
PPS and PEEK can provide the thermal, chemical, mechanical, and electrical performance these systems require. Emabond provides manufacturers with another way to assemble these materials when conventional welding, adhesives, or mechanical fastening cannot satisfy the complete application.
Emabond Solutions can review production-intent materials, joint geometry, operating conditions, and leak requirements to determine whether electromagnetic welding is appropriate for a PPS or PEEK component.
Contact Emabond Solutions to Discuss Your Application
Frequently Asked Questions
Can glass-filled PPS be plastic welded?
Yes. Glass-filled PPS can be welded, but the process must account for the reduced amount of polymer at the joint, restricted melt flow, fiber orientation, and differences among compound formulations. Exact-grade testing is recommended.
Can PPS cooling manifolds be hermetically welded?
Potentially. The ability to create a hermetic seal depends on joint design, material grade, molded-part tolerances, fixture support, weld parameters, and the required pressure or leak rate. Emabond can generate heat continuously around complex manifold paths.
Is PEEK suitable for data center liquid cooling?
PEEK may be appropriate when a component requires unusually high temperature, chemical, mechanical, purity, or long-term performance. PPS or another engineering thermoplastic may be more economical when the requirements are less severe.
What is the advantage of welding a manifold instead of using a gasket?
Welding can eliminate a separate gasket, fastening hardware, bolt holes, and loss of sealing pressure caused by plastic creep. The tradeoff is that a permanently welded manifold is generally not designed for routine disassembly.
Can Emabond weld components containing sensors or electronics?
Emabond does not introduce mechanical vibration through the assembly, and heat is generated primarily at the weld joint. The electromagnetic field and resulting temperatures must still be evaluated around conductive components, circuit boards, sensors, and wiring. Although typically, the RF coil can be configured to ignore sensors or electronics inside the device we would be welding.
Can different PPS grades be welded together?
Potentially. Different PPS grades may contain different glass levels, minerals, impact modifiers, flame retardants, or electrical additives. Emabond can formulate the intermediary weld material for the combination, but application-specific testing is required.
Which data center components are the strongest candidates for Emabond?
The strongest candidates are generally large or complex thermoplastic components requiring continuous leak-tight seals, including coolant manifolds, pump housings, valve bodies, reservoirs, filter housings, flow-control assemblies, and enclosures containing sensitive components.