NEWARK, United States, July 15, 2026 – The global chiplet underfills market is gaining strong traction as AI accelerator packaging, interposer-based designs, and high-bandwidth memory integration reshape semiconductor reliability priorities. According to Future Market Insights (FMI), the market was valued at USD 690.6 million in 2026 and is projected to reach USD 3,263.3 million by 2036, expanding at a CAGR of 16.8% during the forecast period.

Chiplet underfills are becoming a critical material layer in advanced semiconductor assemblies, where package owners require reliable stress relief, void control, and solder joint reinforcement. As chiplet architectures move into larger 2.5D and 3D package structures, suppliers are being evaluated not just on chemistry, but also on flow behavior, thermal cycling stability, and package-specific qualification support.

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Key Market Highlights at a Glance

• Market size in 2026: USD 690.6 million
• Forecast market size in 2036: USD 3,263.3 million
• CAGR from 2026 to 2036: 16.8%
• Leading sales channel in 2026: Direct to OSAT / IDM
• Direct to OSAT / IDM share in 2026: 78.0%
• Leading chemistry in 2026: Epoxy-based
• Epoxy-based share in 2026: 62.0%
• Leading underfill type in 2026: Capillary Underfills
• Capillary Underfills share in 2026: 46.0%
• Leading package type in 2026: 2.5D / Interposer Packages
• 2.5D / Interposer Packages share in 2026: 38.0%
• Fastest-growing country: China
• China CAGR through 2036: 18.7%

Why Is the Chiplet Underfills Market Growing?

The market is expanding as advanced package designs require stronger protection around fine-pitch interconnects and large-body assemblies. AI and HPC platforms are increasing the number of chiplet-based builds that need low-void underfill coverage, while HBM-linked architectures are raising the reliability burden on package materials.

Three major factors are supporting growth:

• AI accelerator and HPC package scaling is increasing demand for reliable underfill materials in large interposer assemblies.
• OSAT and IDM qualification requirements are tightening, making direct supplier validation more important than ever.
• HBM integration is pushing package designs toward higher density, where thermal-mechanical stress control becomes critical.

“Chiplet underfills are becoming a reliability control point inside advanced packaging rather than a small material input,” said a Future Market Insights analyst. “Suppliers that can demonstrate low-void flow, controlled cure behavior, and strong thermal cycling performance will be best positioned to win OSAT and IDM programs.”

Which Chemistry Leads the Chiplet Underfills Market?

Epoxy-based chemistry is expected to dominate the market in 2026 with a 62.0% share. Its leadership reflects proven cure behavior, broad manufacturing familiarity, and a long reliability track record across semiconductor packaging programs.

Epoxy-based underfills remain the preferred choice because they offer a practical balance of performance, process stability, and supplier qualification depth. As package owners focus on reliability testing and field durability, epoxy systems continue to benefit from strong trust across advanced packaging applications.

Supporting points:

• Epoxy-based share in 2026: 62.0%
• Silicone-modified epoxy is gaining attention where softer stress behavior is needed.
• Hybrid chemistries are emerging for package-specific performance tuning.

Why Does Direct to OSAT / IDM Lead Demand?

Direct to OSAT / IDM is projected to hold 78.0% of the market in 2026, making it the largest sales channel. This reflects the fact that chiplet underfills are highly specification-driven, and package owners want direct control over approved material lists before volume release.

This channel is especially important because qualification for advanced packages often depends on engineering support, failure-analysis collaboration, and process validation at the package level rather than at the distributor level.

Supporting points:

• Direct to OSAT / IDM share in 2026: 78.0%
• Distributor channels remain relevant for lower-volume programs.
• Material approval is closely tied to package reliability and engineering review.

Which Countries Are Growing Fastest?

China is expected to lead country growth with a 18.7% CAGR through 2036, supported by integrated circuit output scale and expanding advanced packaging capacity. South Korea follows with a 17.9% CAGR, driven by HBM leadership and memory packaging reliability needs. The United States, Japan, India, Germany, France, and the United Kingdom also show solid momentum as advanced packaging ecosystems mature.

China’s growth is reinforced by domestic OSAT expansion and AI chip demand, while South Korea benefits from memory-led high-performance packaging. The United States is supported by advanced packaging investment and pilot-line development, and Japan continues to benefit from its deep materials expertise.

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Who Are the Key Players in the Chiplet Underfills Market?

Competition is centered on formulation depth, package validation, and technical service capability.

• Henkel – strong large-body flow validation and global reach
• NAMICS – deep application support and advanced package reliability expertise
• Panasonic Industry – broad chemistry and materials portfolio
• Shin-Etsu Chemical – strong formulation and reliability depth
• Resonac – focused on next-generation packaging materials
• Kyocera – advanced packaging material specialization
• MacDermid Alpha – package reliability and process support
• Master Bond – niche application-driven solutions
• Dow – broad material capabilities across electronics applications

Companies that can prove low-void flow, warpage control, and thermal cycling durability are expected to gain earlier access to AI and HPC packaging programs.

Frequently Asked Questions

What is the size of the chiplet underfills market in 2026?

The chiplet underfills market is valued at USD 690.6 million in 2026.

What is the forecast value of the chiplet underfills market by 2036?

The market is projected to reach USD 3,263.3 million by 2036.

What is the CAGR of the chiplet underfills market from 2026 to 2036?

The market is expected to grow at a CAGR of 16.8% during the forecast period.

Which chemistry leads the chiplet underfills market?

Epoxy-based chemistry leads the market with a 62.0% share in 2026.

Which sales channel leads the chiplet underfills market?

Direct to OSAT / IDM leads with a 78.0% share in 2026.

Which country is growing fastest?

China is the fastest-growing country, with a projected CAGR of 18.7% through 2036.

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About Future Market Insights (FMI)

Future Market Insights, Inc. (FMI) is an ESOMAR-certified, ISO 9001:2015 market research and consulting organization trusted by global enterprises and Fortune 500 clients. With operations across the U.S., UK, India, and Dubai, FMI provides data-backed insights and strategic intelligence across 30+ industries and 1200 markets worldwide.