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LOCTITE® SI 5331™ – Acetoxy silicone thread sealant – Plastic pipe threaded fittings for hot/cold water

  • Item Name: LOCTITE® SI 5331™
  • Manufacturer: Henkel
  • Product Category: Thread sealing sealant
  • Technologies: Silicone (Acetoxy silicone)
  • Applications: Ideal for sealing plastic pipe threaded fittings carrying hot or cold water.
  • Color: White paste
  • Cure Type: Humidity cure (ambient moisture cure)
  • Package Size: Contact Techniq VN for details.
  • Shelf Life: Contact Techniq VN for details.

1. Product Overview

LOCTITE® SI 5331™ is a one-component, acetoxy silicone sealant designed for thread sealing applications. It provides a flexible, low-strength seal for plastic pipe threaded fittings carrying hot or cold water. It cures at ambient temperature under atmospheric moisture to form a reliable seal.

2. Applications

  • Thread sealing for plastic pipe fittings
  • Suitable for hot and cold water systems
  • Recommended for use where food contact is not possible (NSF P1 registered)

3. Typical Properties

Uncured Properties

Property Value
Appearance White paste
Specific Gravity @ 25°C 1.1
Viscosity (Spindle 7, 10 rpm) 50,000 mPa·s (cP)
Cure Type Humidity
Open Time @ 25°C 5 minutes

Cured Properties (After 72 hours @ 22°C)

Property Value
Breakaway Torque (M10 steel nuts & bolts) 1.5 N·m (13.3 lb.in)
Prevail Torque (M10 steel nuts & bolts) 0.5 N·m (4.42 lb.in)
Breakloose Torque (Pre-torqued to 5 N·m) 4.5 N·m (39.8 lb.in)
Max. Prevail Torque (Pre-torqued to 5 N·m) 1.0 N·m (8.85 lb.in)

Environmental Resistance

  • Effective sealing up to 0.3 MPa in water at 90°C
  • Maintains sealing performance at temperatures up to 150°C
  • Withstands 12-month cycling between 20°C and 90°C in water/glycol

Additional Information

  • Not recommended for pure oxygen or chlorine-rich systems
  • Requires 96 hours curing at 20-23°C before use in potable water systems
  • Store between 8°C and 21°C for optimal performance

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