Hylosil 303 Translucent RTV Silicone Technical Data Sheet

HYLOSIL 303 SILICONE SEALANT
Acetoxy curing RTV silicone sealant
Description
Hylosil 303 Silicone Sealant is a Room Temperature Vulcanising (RTV) general purpose silicone
sealant. Once applied the compound reacts with atmospheric moisture, to form a tough, durable
rubber seal. It has excellent adhesion to metals, glass, ceramics and plastics.
The compound has large gap filling properties which makes it ideal for application to non-machined
surfaces and even as cast surfaces.
Hylosil 303 Silicone Sealant is resistant to oil, water and lubricants. It will remain flexible to
withstand vibration
Typical Properties, Uncured Product
Colour Translucent
Consistency Non-slump paste
Cross Linking System Acetoxy
Specific Gravity (DIN 53479) 1.03 g/ml
Solids Content 100%
Extrusion Rate 3mm orifice @ 60 psi 78 g/minute
Skin Forming Time at 23°C/50% RH 6 minutes
Cure Rate @ 25°C and 60% RH 3mm per 24 hours
Cured Product
Tensile Strength DIN 53505, S3A 1.9 N/mm2
Elongation @ Break DIN 53504, S3A 460%
E Modulus @ 100% Elongation 0.4 N/mm2
DIN 53504, S3A
Hardness Shore A DIN 53505 22°
Tear Strength ASTM D 624, Form B 5 N/mm2
Shrinkage DIN 53504, S3A 3%
Typical temperature Range -40° to 240°C
Ignition Temperature DIN 51794 460°C
Instructions for use
Surface should be clean, dry and free from contamination such as oil or grease. Once applied in
Gasket applications, the joint should be assembled without delay.
Information given in this publication is based upon technical data gained in our own and other Laboratories and is believed to be true. However the material is used in
conditions beyond our control thus we can assume no liability for results obtained or damages incurred through the application of the data present herein.
Hylomar Ltd, Cale Lane, Wigan WN2 1JT UK
Tel: +44 (0) 1942 617000
Fax: +44 (0) 1942 617001
Revision date
Product name
08.06.2010
Page 1
Hylosil 303 issue 5
of 2
Care should be taken when applying the compound to ensure any excess product will not foul any
internal channels and cause blockages. Any excess uncured product extruded externally can be
wiped away with a damp cloth.
When stripping assemblies that have been sealed with Hylosil 303 Silicone Sealant, carefully scrape
away as much of the cured product as possible. The remaining compound can be softened and
removed by using a suitable Silicone Sealant Remover.
Typical Applications
Hylosil 303 Silicone Sealant is a general purpose adhesive and sealant with many applications in
building, engineering and the automotive industry. It has excellent adhesion without primer to
metals, glass, ceramics and most rigid plastics. The cured compound is resistant to many solvents,
oil, water and lubricants.
Handling and Safety Properties
Not classified according to CHIP 3.1 2005.
Risk Phrases: None.
Safety Phrases: S26 and S28.
For further information please refer to the Safety Data Sheet.
Packaging
Hylosil 303 Silicone Sealant is available in 100ml tubes, 300ml cartridges and 17L kegs.