TEROSON® EP 5055

Name: TEROSON® EP 5055
Brand: TEROSON

Features and Benefits

A solvent-free, high-strength, epoxy based panel bonder that provides corrosion protection, while improving body stiffness and NVH properties, for extended vehicle lifetime and driving comfort.

TEROSON® EP 5055 is a black (part A) and gray-green (part B) epoxy-based adhesive designed for high-strength structural bonding and corrosion-protection of bare steel, zinc-coated steels and aluminum alloys used in the automotive industry and body repair shops. It’s particularly ideal for roof and panel bonding. The mixed compound has a ~80-minute processing time (23°C/73°F, 50% rh) and it reaches its initial strength (0,1MPa) in ~7h at 23°C (73°F). Full cure occurs at room temperature in 48 hours; curing can be accelerated via infrared heat at 60°C (140°F) for 1 hour or 80°C (176°F) for 30 minutes. For application, please use a pneumatic or manual, dual cartridge dispenser, e.g. LOCTITE® HD14 Handheld Pneumatic Dual Cartridge Dispenser (200ml, item 2693824) or LOCTITE® HD14 Handheld Manual Dual Cartridge Dispenser (200ml, item 2693822). Before application, surface pretreatment with TEROSON® VR 10 is recommended.

OEM approved
Excellent corrosion prevention
Adheres to a wide range of materials (without primer) such as aluminum, steel and sheet molding compounds
Can be spot-welded (if not solidified)
Provides body stiffness, primarily for NVH purposes & weld reduction
Easy preparation and application

Documents and Downloads

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Technical Information

Full cure time, @ 80.0 °C	60.0 min.
Recommended for use with	Epoxy

How to

Step by Step Guide

1. Cleaning

Bonding surfaces must be free of oil, grease, dust, or any other contaminant. Clean bonding surfaces with any solvent base cleaner and a lint-free cloth.

2. Prepare surface

Remove old adhesive from existing body parts to make sure they are back to bare metal and free of any contamination.

3. Pretreat surface

Both bonding surfaces must be cleaned again to remove grinding dust. Pretreat bonding surfaces with any solvent base cleaner. Allow the prepared surfaces to dry for approximately 5 minutes.

4. Prepare cartridge

Unscrew the coupling ring and remove the cap from TEROSON® EP 5055 cartridge. Before attaching the static mixer to the cartridge, squeeze out a small amount of material until both adhesive components run equally. This is necessary to achieve a good mix of the two components.

5. Attach mixer and insert cartridge

Attach the static mixer and fix it with the coupling ring. Insert the cartridge into the application dispenser.

6. Prepare adhesive

When mixed, TEROSON® EP 5055 is very dark grey in color (almost black). Discard first 5 cm of adhesive.

7. Apply and spread adhesive

Apply and spread TEROSON® EP 5055 with a spreader or brush. All bare metal areas should be covered with adhesive for corrosion protection. TEROSON® EP 5055 can be used on steel and aluminum panels and as part of the preparation. With new panels, the ‘e coat’ must be removed from the bonded area and adhesive applied and spread to cover the bare metal.

8. Working time

Open time for mixed adhesive (at normal room temperature of 23°C/73°F) is approximately 80 minutes. It may be necessary to change the static mixer if no material has been passed through it in over 30 minutes.

9. Remove excess adhesive

Remove excess adhesive immediately with spatula or cloth using any solvent-base cleaner. Cured adhesive can only be removed mechanically.

10. Assemble components

Join and fix components within the 80 minutes processing time. If spot welding is required, it must be carried out during this initial period. Do not subject bonded parts to stress before final cure.

11. Curing time

The adhesive cures at room temperature - initial strength approximately 4 hours at 23°C/73°F; final strength approximately 48 hours at 23°C. Curing time can be accelerated using common tools like infrared or heating pads -full strength in 60 minutes at 65°C/149°F or 30 minutes at 100°C/212°F. During the curing phase, avoid movement or stress until the product is fully cured.

12. Painting

When initial bond strength has been reached, bonded parts can be painted.

13. Disposal of TEROSON EP 5055

Cured product and empty cartridges are disposed of as normal waste. Uncured material has to be disposed of as hazardous waste. See Safety Data Sheet for more details.

Frequently Asked Questions

The substrates bonded with these adhesives, react differently when impacted. TEROSON® EP 5055 is a panel bonding adhesive vs TEROSON® EP 5065 which is an impact resistant structural adhesive. TEROSON EP 5065 can absorb a lot more energy and reduce the impact of a crash. An impact resistant structural bonder is usually used in joints, frame rail assemblies, strut tower assemblies and other body structure joints that have critical strength requirements. Additionally the open time (pot life) of TEROSON EP 5055 is 80 minutes; for TEROSON EP 5065 it is 60 minutes.

Both are 2-component, solvent-free, spot weldable (before the product solidifies) epoxies that prevent corrosion and give lap shear strength to bonded panels. Due to their epoxy chemistry they are temperature sensitive, therefore it is recommended to allow the product to reach ambient temperature before use.

We need to ensure even mixing of the product's 2 components to ensure proper bonding performance. Therefore, we must squeeze twice. 1) Squeeze a small amount directly from the cartridge. 2) Apply the nozzle and squeeze until you see a homogenous color in the end-product, coming through the nozzle.

OEM repair instructions should be used as guidance to select an adhesive for panel bonding or impact-resistant structural bonding. Technical requirements change due to design variations, therefore it is critical to follow OEM instructions based on model and year.

As long as you seal the cartridge correctly with the used nozzle left on, you may store the product for 2-3 weeks, depending on the temperature in the workshop. The material left in the nozzle will serve as a perfect sealant to preserve the content inside of the cartridge.

Areas bonded with metal bonders (epoxy-based), don’t require cavity wax to ensure corrosion protection. All other areas should be coated with wax to prevent corrosion.