Hylomar M Heavy high-viscosity liquid sealant for metal, plastic, and threaded connections
The product is intended for sealing contact surfaces, threaded connections, and tightly fitted metal and plastic elements.
The Heavy variant, also designated H, creates a thicker sealing film than the Light and Medium versions. This makes it a good choice where a more filling, plastic sealing layer is needed, but the connection still needs to be disassemblable.
Applications of Hylomar M Heavy 80 ml
Hylomar M Heavy is used to seal surfaces and threads in connections exposed to oils, fuels, coolants, water, water/glycol mixtures, air, and combustion products of piston and turbine engines.
The product is suitable for applications such as oil pans, water and oil pumps, timing covers, intake manifolds, inspection covers, cylinder heads, gears, transmission components, and flat machined surfaces.
What distinguishes Hylomar M Heavy
The most important feature of Hylomar M Heavy is its high viscosity and greater thickness of the sealing film. For the Heavy version, the manufacturer states a film thickness of 0.09 mm, a typical surface finish of 3.5 µm, a yield of 0.67 m² from an 80 ml container, and a dry coverage of 12 mg/cm².
Hylomar M Heavy does not harden and does not form a hard, brittle joint. It remains plastic, making it easier to disassemble components during service.
When to choose Hylomar M Heavy
Hylomar M Heavy is a good choice when you need a thicker liquid seal for removable joints, machined surfaces, or threads. It's a practical solution for service repairs, maintenance, automotive workshops, and industrial applications where tightness and the ability to disassemble components are important.
The Heavy variant makes sense especially where the Medium version may be too thin and the joint requires a more filling sealant layer. The product is not a structural adhesive and should not be used as a substitute for permanent bonding technology.
How to use Hylomar M Heavy
Surfaces should be clean and dry. Apply the product in a thin, even layer to the surfaces to be sealed, then wait for the solvent to evaporate. The joint can then be assembled and screwed together.
It allows time for the components to be positioned smoothly and is useful where assembly control and subsequent disassembly are important.
In the case of bolted connections, it is worth checking the tightness after a short time, as the compound may settle under pressure. Product residue after disassembly can be removed with a suitable cleaning agent according to the manufacturer's recommendations.
What to look for before use
Hylomar M Heavy is a sealant, not a structural adhesive. It is not intended for permanent load transfer through a joint and does not replace mechanical connections where they are structurally required.
The product contains a solvent and, before its evaporation, must be handled away from sources of ignition, with good ventilation, and in accordance with the safety data sheet. Before use in critical applications, verify the operating conditions, media, and process requirements.
Technical data Hylomar M Heavy 80 ml
Parameter | Value
Product | Hylomar M Heavy
Variant | Heavy Grade / H
Net capacity | 80 ml
Packaging | Tube 80 ml
Base Chemical | Polyester-urethane
Operating temperature range | From -50°C to +250°C
Film thickness for Heavy version | 0.09 mm
Typical surface finish for Heavy version | 3.5 µm
Yield per 80 ml container for Heavy version | 0.67 m²
Coverage after drying for Heavy version | 12 mg/cm²
Resistance to media | Fuels, oils, coolants, gases, water, water/glycol and methanol mixtures, air, engine combustion products Piston and Turbine Engines
Typical Applications | Intake manifolds, timing covers, gears, transmission components, thread sealing, machined surfaces, water and oil pumps, inspection covers, cylinder head gaskets, oil pans, gas turbines
Can be used with a gasket | Yes, can be used with or without a gasket
Can be dismantled later | Yes
Store in the original, tightly closed container, in dry and well-ventilated place. The product should be protected from excessive heat, sources of ignition, and direct sunlight. Detailed storage conditions should always be verified with the manufacturer's current safety data sheet.
Is Hylomar M Heavy the same as Hylomar H?
Hylomar M Heavy is the Heavy Grade variant of the HYLOMAR M family. In practice, it may be marked as H, i.e. a version with higher viscosity and a greater film thickness than Light and Medium.
How is Hylomar M Heavy different from Hylomar M Medium?
The Heavy variant creates a thicker sealing film. The manufacturer specifies 0.09 mm for Heavy, and 0.03 mm for Medium. Heavy will therefore be a better choice where a more filling sealing layer is needed.
Does Hylomar M Heavy harden after application?
No. After the solvent evaporates, it remains a plastic sealing layer.
Is Hylomar M Heavy suitable for oil pans?
Yes. The product is recommended for flat, rigid oil pans and other connections exposed to oil, provided the surface is properly prepared.
Can Hylomar M Heavy be used on threads?
Is Hylomar M Heavy resistant to fuels and oils?
Yes. The product is resistant to a wide range of media, including fuels, oils, coolants, gases, water, water/glycol mixtures, and methanol.
Can Hylomar M Heavy be used without a gasket?
Yes. The product can be used with or without a seal, depending on the joint design and application requirements.
Does Hylomar M Heavy replace structural adhesive?
No. Hylomar M Heavy is a sealant, not a structural adhesive. It should not be considered a product for permanent load transfer.
Color: nan
Size: 80 ml
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