LOCTITE® 4902 FL

Name: LOCTITE® 4902 FL
Brand: LOCTITE

Features and Benefits

LOCTITE 4902 FL is a fluorescent, highly flexible cyanoacrylate adhesive designed for the assembly of flexible medical devices.

LOCTITE® 4902 FL offers excellent sealing capability and resistance to leaks while providing strength in flexing bond lines. It also offers performance advantages in speed and ease of use.

Documents and Downloads

Download TDS

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Additional Documents

Product information sheet: Highly Flexible Instant Adhesive Global

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English

Technical Information

Application method	Dispense system, Manual
Applications	Sealing
Color	Clear
Cure type	Moisture cure
Fixture time, Steel	20.0 sec.
Gap fill	0.1 mm
Key characteristics	Fluorescent
Number of components	1 part
Operating temperature	-40.0 - 80.0 °C (-40.0 - 180.0 °F )
Physical form	Liquid
Recommended for use with	Elastomer, Plastic, Rubber
Shear strength, Mild Steel (grit blasted)	12.0 N/mm² (1745.0 psi )
Storage temperature	2.0 - 8.0 °C
Resin
Viscosity, Resin	175.0 mPa·s (cP)

How to

Step by Step Guide

1. Preparation - Cleaning

It is recommended to use the correct LOCTITE® cleaner for the surface to be bonded (such as LOCTITE® SF 7070) to degrease and clean surfaces prior to applying the adhesive.

2. Preparation - Priming

To improve adhesion on difficult to bond plastic surfaces, apply LOCTITE® SF 770 to the bond area by brushing or dipping. Avoid applying excess primer. Allow the primer to dry.

3. Preparation - Activation

If cure speed is too slow, use activator LOCTITE® SF 7452 or LOCTITE® SF 7455 (see cure speed vs activator graph in TDS). Apply activator to one bond surface by spray, brush or dipping (not primed surfaces). Allow the activator to dry.

4. Application

Apply adhesive onto one side/part.

5. Assembly

Assemble parts immediately. The parts should be accurately located as the short fixture time leaves little opportunity for adjustment. Bond should be held or clamped until the adhesive has fixtured. Hint: if necessary, excess product can be cured by activator LOCTITE® SF 7452 or LOCTITE® SF 7455. Spray or drop activator onto excess product.

Equipment

For precise dispensing of small amounts of adhesive, the use of dispensing needles is recommended.

Frequently Asked Questions

This is a result of stress cracking. Leaving uncured liquid CA remaining on some plastic substrates (such as polycarbonate, acrylic, and polysulfone) in a stressed condition, may cause the formation of cracks in the plastic. Some remedies for avoiding/minimizing stress cracking are closing the bond joint quickly, using reinforced grades of plastic, anneal parts, or speed cure the adhesive with accelerator or light (for light cure products only).

All necessary H&S measures and PPE (personal protection equipment) requirements can be found on the product material safety data sheet, all of which are available via our website.

This is called blooming. This often occurs when there is an excessive amount of product being applied. To avoid blooming, use proper ventilation, less product, lower humidity, use a primer/accelerator, or a low bloom product.

Yes, instant adhesives should be stored in the refrigerator prior to opening, but DO NOT refrigerate them once they have already been opened. After opening, the product should be used within 30 days for best performance.