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LOCTITE® SI 5900™ is a sealing product primarily used for applications requiring excellent resistance to automotive engine oils. It is commonly applied in sealing stamped sheet metal covers such as timing covers and oil sumps. This product is chosen for its ability to withstand high joint movement and its strong resistance to automotive engine oils, making it a suitable choice for sealing in automotive contexts.

Supplied By: Henkel Corporation

Product Code: H01987

Regional Availability: Canada

Product Type: 1K (1 component) Sealant

Compatible Substrates & Surfaces: Metal

    Enhanced TDS

    Identification & Functionality

    Features & Benefits

    Ready-to-Use Product Features
    Product Highlights

    Excellent resistance to automotive engine oils

    Applications & Uses

    Compatible Substrates & Surfaces
    Curing Information
    • Cure - Room temperature vulcanizing (RTV)
    • Application - Sealing
    Recommended Applications
    • Typical applications include stamped sheet metal covers (timing covers and oil sumps) where good oil resistance and the ability to withstand high joint-movement is required.
    • It withstands on line, low pressure tests carried out before product begins to cure.
    • The thixotropic nature of the product reduces the migration of liquid product after application to the substrate.
    • This has an excellent adhesion profile to an outstanding wide variety of plastic substrates, as well as glass, ceramics and metals.
    Application Information
    • For best performance bond surfaces should be clean and free from grease.
    • Moisture curing begins immediately after the product is exposed to the atmosphere, therefore parts to be assembled should be mated within a few minutes after the product is dispensed.
    • The bond should be allowed to cure (e.g. seven days), before subjecting to heavy service loads.
    • Excess material can be easily wiped away with non-polar solvents.
    General Information

    This product is not recommended for use in pure oxygen and/or oxygen rich systems and should not be selected as a sealant for chlorine or other strong oxidizing materials.


    Physical Form
    Black Pastels (Uncured)

    Packaging & Availability

    Packaging Type
    Regional Availability
    • Canada

    Storage & Handling

    Storage Information
    • Store product in the unopened container in a dry location.
    • Storage information may be indicated on the product container labeling.
    • Optimal Storage: 8°C to 21°C. Storage below 8°C or greater than 28°C can adversely affect product properties.
    • Material removed from containers may be contaminated during use.
    • Do not return product to the original container.