Loctite SF 7387 Activator

Loctite SF 7387 Activator is a commercial-grade, very low viscosity surface primer engineered exclusively to initiate and accelerate the cure speed of Loctite toughened acrylic adhesives. Formulated with high-performance n-Heptane and isopropanol solvents, this amber translucent activator ensures rapid fixturing and consistent structural bond strength in high-demand manufacturing and assembly operations.

Technical Specifications

• Product: Loctite SF7387 Activator
• Chemical Type: Substituted dihydropyridine
• Solvents: n-Heptane and Isopropanol
• Viscosity: Very low
• Color: Amber, Translucent, Yellow
• Application: Cure promotion of toughened acrylic adhesives
• Optimal Storage Temperature: 8 °C to 21 °C (Storage below 8 °C or greater than 28 °C can adversely affect product properties)
• Open Time (Active Life): Up to 2 hours after solvent evaporation
• Assembly Window: Within 15 seconds after adhesive application onto the activated surface

Directions for Industrial Application

• Surface Preparation: Most surfaces can be bonded "as received." However, excessive oil, loose oxide layers, or heavy contamination should be cleaned to achieve maximum tensile strength.
• Application Method: Brush or apply the activator to one of the mating surfaces. Apply the acrylic adhesive to the opposing mating surface.
• Large Gaps: For gaps greater than 0.4 mm, or where maximum cure speed is required, two-surface activation (treating both mating sides) is highly recommended.
• Evaporation Time: Allow 1 to 5 minutes for the solvent to fully evaporate. The active ingredients will appear wet and remain highly active for up to 2 hours. Prevent surface contamination during this window.
• Handling & Security: Once the adhesive is applied to the activated surface, complete the assembly within 15 seconds. Secure the components and await proper fixturing before moving or subjecting the bond to handling stresses.

Handling, Storage, and Safety Compliance

LOCTITE SF 7387 is classified as HIGHLY FLAMMABLE. It must be stored in unopened translucent containers in a dry, dark location to protect its light-sensitive active ingredients. Do not store near strong oxidizing agents or combustible materials. This product is not recommended for use in pure oxygen or oxygen-rich systems, and must not be selected as a sealant for chlorine or strong oxidizing materials. Never mix the activator and adhesive directly as liquids. Use only in well-ventilated production environments.

Frequently Asked Questions

Q: What is the fixture time and cure speed when using Loctite SF 7387?
A: The exact fixture time and cure speed depend heavily on the specific acrylic adhesive selected, the substrate materials being bonded, surface cleanliness, and whether a single-surface or two-surface activation method is deployed.

Q: Can Loctite SF 7387 be mixed directly with acrylic adhesives?
A: No. Under no circumstances should the activator and adhesive be mixed directly as liquids. The activator must be applied to one surface, allowed to evaporate, and the adhesive applied to the opposing surface before joining.

Q: How long does Loctite SF 7387 remain active after application?
A: Once applied, allow 1 to 5 minutes for the solvent to evaporate. The remaining active ingredients will appear wet and remain active for up to 2 hours. However, once the adhesive meets the activated surface, assembly must be completed within 15 seconds.

Q: What are the specific storage requirements to avoid degrading Loctite SF 7387?
A: The product must be stored in its original, unopened container between 8 °C and 21 °C in a dark place, as it is light-sensitive. Storage below 8 °C or above 28 °C will adversely alter the activator's chemical properties.

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