Silicone and other Sealants

Silicone 401 RTV


Silicone 401 RTV is a one part ready to use, acid cure, room temperature vulcanising (RTV), silicone adhesive sealant. It cures rapidly on exposure to atmospheric moisture to form a versatile, durable, resilient silicone rubber. It is available in clear.


Silicone 401 is suitable for form-in-place gaskets and for adhesive, sealing and electrical insulating applications in manufacturing and plant maintenance.

Product Range

Product Code: 9300697606976

  • Size & Pack Type: 310g cartridge
  • Color: Clear

Technical Features

  • Wide Temperature Tolerance: Remains permanently flexible under operating temperatures from – 60oC to 205oC, and will tolerate short periods of 260oC
  • Good Chemical Resistance: Good resistance to most organic and inorganic chemicals, solvents and oils
  • Primerless Adhesion: Adheres without primer to many metal, glass, ceramic, rigid plastic, rubber painted and wood substrates
  • Non-toxic: Suitable for incidental food contact in food handling equipment and food contact surfaces
  • Excellent Weatherability: Excellent resistance to ozone, UV light and ageing
  • Good Electrical Insulating Properties: Insulating properties are comparable to other insulating rubbers at room temperature, though performs better than many other rubbers at higher temperatures and water has little effect on these properties

Application Tips

  • Not recommended for use with petrol, distillate and some other hydrocarbon solvents. These can cause softening and swelling which is undesirable in some applications.
  • Do not use in totally confined joints where sealant is not exposed to atmospheric moisture
  • Chemical compatibility should be tested for each application under consideration
  • Cannot be over-painted

Technical Details and Performance

Indicative information only, not to be used for setting specifications.

Typical Application Properties


Non – sag, gun grade

Tack Free Time

(25oC, 50% r.h.): 15 – 20 minutes

Skin Forming Time

5 to 10 minutes (depending on weather conditions)

Cure Time

(3mm Section @ 25oC, 50% R.H.): 24 hours

Shrinkage During Curing

Approximately 3.5% by volume

Specific Gravity


Storage Life

(Below 30oC in original unopened container):12 months

Typical Mechanical Performance Properties (3 day cure @ 25oC, 50% R.H.)

Tensile Strength (MPa)


Ultimate Elongation %


Hardness (Shore A)


Tear Strength (N/mm)


Joint Movement Capability

± 25%

Typical Electrical Properties (at Room Temperature)

Dielectric Strength kv/mm


Dielectric Constant @50Hz to 5MHz


Dissipation Factor Tan @50Hz-5MHz

20×10-4 to 5×10-4

Volume Resistivity (ohm-cm)

1×1013 (wet 60oC)
1×1014 (dry 23oC)

Typical Thermal Properties

Brittle Point


Maximum Continuous Operating Temperatures


Maximum Intermittent Operating Temperatures


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