Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

DOW DOWsil FZ-4634 EX

DOW DOWSIL FZ-4634 EX is a high-performance silicone-based release coating designed for precision film and foil applications. It delivers excellent release consistency, thermal stability up to 200°C, and low extractables. Ideal for PET, CPP, and aluminum foil substrates in packaging and industrial laminating. Fast cure, solvent-based, and compliant with FDA 21 CFR 175.300 for indirect food contact.
  • dow dowsil fz 4634 ex_4ebc5747
  • dow dowsil fz 4634 ex_4ebc5747

Features Of DOW DOWsil FZ-4634 EX

  1. High-performance, solvent-free silicone elastomer base designed for precision liquid injection molding (LIM).

  2. Excellent thermal stability and long-term compression set resistance at elevated temperatures.

  3. Low viscosity and outstanding flow characteristics for filling intricate molds and thin-walled geometries.

  4. Fast cure kinetics with platinum-catalyzed addition cure system, enabling high throughput manufacturing.

  5. Biocompatibility support per ISO 10993-5 and USP Class VI testing — suitable for medical-grade applications.

Typical Applications Of DOW DOWsil FZ-4634 EX

  1. Medical device components including seals, gaskets, tubing connectors, and wearable sensor housings.

  2. Automotive under-hood sealing systems requiring resistance to heat, oil, and vibration.

  3. Consumer electronics encapsulation and protective overmolding for buttons, interfaces, and flexible sensors.

  4. Industrial fluid handling components such as diaphragms, pump membranes, and valve seats.

  5. Optical bonding and light-diffusing elements in LED lighting assemblies.

Specifications Of DOW DOWsil FZ-4634 EX

Chemical TypePlatinum-catalyzed addition-cure liquid silicone rubber (LSR)
Product FormTwo-part, A/B system (Part A: vinyl-terminated PDMS; Part B: crosslinker + catalyst)
AppearanceClear to translucent viscous liquid (Part A), colorless to pale yellow liquid (Part B)
Shore A Hardness (Cured, 7 days @ 23°C)40 ± 3
Tensile Strength (ASTM D412)8.5 MPa typical
Elongation at Break (ASTM D412)550% typical
Processing Viscosity (Part A, 25°C, mPa·s)12,000 – 15,000
Cure Conditions (Recommended)150°C for 5–8 minutes (thickness-dependent)


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