Loctite SF 770 Primer

Henkel Loctite SF 770 Primer is an adhesion promoter formulated for use with polyolefins and other low surface energy plastic materials. Only recommended for difficult to bond substrates including polyethylene, polypropylene, polytetrafluoroethylene, and thermoplastic rubber materials. Not recommended when high peel strength is required. 16 oz Can.

  • Improves adhesion of instant adhesives to polyolefins and other low surface energy plastics
  • Only for difficult-to-bond plastics
  • IMPORTANT NOTE: This product was upgraded in 2021/2022. Please utilize the product IDH/item number to ensure correct SDS is downloaded.
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Loctite  SF 770 is used to make polyolefin and other low energy surfaces suitable for bonding with Loctite cyanoacrylate adhesives. On such treated surfaces the cured performance of LOCTITE cyanoacrylate adhesives is generally similar to that described in the TDS for the relevant adhesive. It is only recommended for difficult to bond substrates which include polyethylene, polypropylene, polytetrafluoroethylene (PTFE) and thermoplastic rubber materials. Loctite SF 770 Polyolefin Primer is not recommended in assemblies where high peel strength is required.


Technical Information

Application Method Pre-Applied
Color Clear: Ultra Clear
Key Characteristics Adhesion: Improves Adhesion
Key Characteristics, Chemical Basis/Base Heptane (Original Formula); Isopropyl Acetate (Upgrade Formula) Solvent Based


Directions for use
Primer may be applied by spraying, brushing or dipping at
ambient temperature. Excess primer should be avoided.
Presence of primer may be detected by means of a UV
inspection lamp (365 nm). If polyolefin and more active or
easier to bond materials are involved, apply the primer to the
polyolefin only. For best results, apply LOCTITE
cyanoacrylate adhesive and bond assembly right after the
LOCTITE SF 770 dries on the surface of the substrate.

Handling Precautions
Primer must be handled in a manner applicable to highly
flammable materials and in compliance with relevant local
regulations. The solvent can affect certain plastics or coatings.
It is recommended to check all surfaces for compatibility before

Store product in the unopened container in a dry location.
Storage information may be indicated on the product container
Optimal Storage: 8 °C to 21 °C. Storage below 8 °C or

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Download Safety Data Sheet – Loctite SF 770

Download Technical Data Sheet – Loctite SF 770