All Alternatives

Alternatives to LOCTITE LOCTITE ECCOBOND UF 1173

LOCTITE LOCTITE ECCOBOND UF 1173 and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.

LOCTITE ECCOBOND UF 1173 compared against its qualified second sources
LOCTITE ECCOBOND UF 1173LOCTITELOCTITE ECCOBOND FP4531LOCTITE (Henkel)LOCTITE ECCOBOND FP4530LOCTITE (Henkel)+1more
FFF CompatibilityBoth materials are one-part liquid epoxies designed for needle or jet dispensing and packaged in standard syringe sizes (e.g., 10cc or 55cc), requiring no major mechanical dispensing equipment modifications.Both are black liquid epoxies that cure to a solid, black, rigid encapsulant with highly similar physical properties and high density.LOCTITE FP4531 matches or exceeds the critical thermal and mechanical protective specifications of UF 1173, including a comparable glass transition temperature (161°C vs 159°C) and excellent thermal shock performance.Supplied in standard syringe packages compatible with identical pressure-dispensing or jet-dispensing systems.The uncured liquid is blue and cures to green, which differs from the standard black color of UF 1173 and may alter optical inspection baselines.Has a lower glass transition temperature (145°C vs 159°C) and a higher CTE (46 ppm/°C vs 20 ppm/°C), representing a downgrade in peak thermal fatigue endurance under high-temperature automotive conditions.
AI Summary

LOCTITE ECCOBOND UF 1173 by LOCTITE: ECCOBOND UF 1173 ONE PART, VOID FREE, SECOND LEVEL EPOXY.

LOCTITE ECCOBOND FP4531 is a premium, non-reworkable capillary underfill from the same manufacturer that provides a very close functional match. With a Tg of 161°C and a low CTE of 28 ppm/°C, it provides equivalent stress relief and interconnect protection for high-reliability CSP and BGA packages. It is highly suited as a drop-in functional alternative for demanding automotive and industrial electronics.

  • Very high glass transition temperature (Tg of 161°C) closely matching the target (159°C)
  • Excellent thermal cycling reliability designed for narrow-gap flip chip and BGA applications
  • Low CTE of 28 ppm/°C below Tg ensuring low thermomechanical stress on solder joints
  • Slightly higher viscosity (10,000 cP vs 7,500 cP) which may require slightly adjusted dispensing speeds or pressure parameters.
  • Slightly higher CTE below Tg (28 ppm/°C vs 20 ppm/°C) compared to the original UF 1173 baseline.

LOCTITE ECCOBOND FP4530 is a faster-flowing capillary underfill alternative from the same manufacturer, offering a lower viscosity that makes it highly suited for smaller gaps. However, because it has a lower Tg (145°C) and higher CTE (46 ppm/°C), it represents a partial functional match and should be reviewed for designs with extreme high-temperature requirements. It also features a useful color-changing cure indicator that shifts from blue to green when fully cured.

  • Significantly lower viscosity (3,500 cP) allows for extremely fast flow in tight micro-gaps
  • Unique cure color-change indicator (changes from blue to green) simplifies optical inspection of fully cured assemblies
  • One-part formulation with stable, void-free capillary flow properties
  • Lower glass transition temperature (145°C vs 159°C) limits its maximum operational temperature baseline compared to the target.
  • Higher coefficient of thermal expansion (46 ppm/°C vs 20 ppm/°C) represents a trade-off in thermomechanical stress absorption.
Lifecycle StatusActiveUnknownUnknown
Market AvailabilityNon-stockUnknownUnknown
REACHUnknownUnknownUnknown
RoHSUnknownUnknownUnknown
DescriptionECCOBOND UF 1173 ONE PART, VOID FREE, SECOND LEVEL EPOXYLOCTITE ECCOBOND FP4531 is a premium, non-reworkable capillary underfill from the same manufacturer that provides a very close functional maLOCTITE ECCOBOND FP4530 is a faster-flowing capillary underfill alternative from the same manufacturer, offering a lower viscosity that make
ManufacturerLOCTITELOCTITE (Henkel)LOCTITE (Henkel)
TypeComponentComponentComponent
DatasheetN/AN/AN/A
Lead Time7 weeksUnknownUnknown
Country of Origin---
Export Control Class NumberEAR99EAR99EAR99
HTSUS Code---
Moisture Sensitivity Level---

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Frequently asked questions

Yes. The LOCTITE LOCTITE ECCOBOND UF 1173 is active and in production. The parts listed here are qualified equivalents if you need a second source or better availability.

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