Hyloseal 620 Technical Data Sheet

HYLOSEAL 620 Red
Pre applied under head sealant
Description
Hylomar Hyloseal 620 Red is a soft, single part, heat cure, polyurethane resin system. It has been
specifically designed for use as a compression seal. It should be pre-applied to one of the sides of the
mating components’ surface and allowed to cure for 30 mins at 160°C prior to assembly. Clamping
the two components together compresses the sealant and therefore effects a seal.
Hylomar Hyloseal 620 Red has excellent chemical resistance to most industrial oils/ fluids. It will
function in temperatures up to 150oC.
Properties (uncured)
Colour Red
Specific Gravity 1.05
Viscosity 22,000 cps
Shelf Life 9 months*
* When stored in the original unopened containers between 5°c to 25°C.
Properties (mixed and cured)
Colour Red
Cure Time @ 160oC 30 mins
Hardness, Shore A 50°
Specific Gravity g/ml 1.05
Shelf life on coated Expected to last the life of component.
components 
Instructions for use.
Stir before use, to ensure a consistent coating of the Hylomar Hyloseal 620 Red on the component
surface, it is best applied via automatic dispensing equipment. An uneven coating height will create
differing compression levels along the sealant bead.
It is essential that adequate ventilation be, installed to remove fumes, during application and heat
cure.
Hylomar Ltd can recommend suitable dispensing equipment.
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
22.03.04
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Typical Applications
Hylomar Hyloseal 620 Red, is ideally used as a replacement for traditional independent gaskets or
seals such as o-rings or cork gaskets. The elimination of these types of gaskets can improve
productivity/ assembly time. It can also give financial saving from a ‘piece-part’ and inventory view-
point.
Handling and Safety Properties
Hylomar 620 Red is classified as Xn, Harmful and Corrosive.
Risk phrases = R20/21 & R34.
Safety phrases = S 26, 28 & 36/37/39.
However once applied and cured, Hylomar Hyloseal 620 Red is inert and not classed as hazardous.
Packaging
Please contact our Sales department for details.