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Potting & Protection

LOCTITE ABLEBOND BF-4 Optoelectronic Encapsulant

One-Part Epoxy · High Tg · Optoelectronic Backfill

Black one-part heat-cure epoxy backfill with strong plastic adhesion, low outgassing, low moisture uptake, high Tg and non-conductive. Designed for optoelectronic potting and structural bonding; used with AA50T for post-alignment backfill.

  • Low moisture uptake and outgassing for stable optical paths
  • High Tg, resilient to temperature and humidity variation
  • Pairs with AA50T for reliable post-alignment backfill

Applications

OSA / TOSA / ROSA module sealingOptoelectronic structural pottingPost-alignment backfillDie attach

Technical Data

ChemistryOne-part epoxy
AppearanceBlack
Viscosity (25℃, 5rpm)23,500 mPa·s
Thixotropic Index1.9
pH4.2
Work Life24 hours @25℃
Cure100℃ × 30 min
Glass Transition (Tg)94 ℃ (TMA)
CTE (below Tg)32 ppm/℃
CTE (above Tg)87 ppm/℃
Storage-40℃, 12 months
Packaging16 g syringe

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