Scotch-Weld Heat-Curing Paste Adhesive EC9360

Transcription

1 Scotch-Weld Product Data Sheet Updated : November 1993 Supersedes : June 1991 Product Description 9360 Epoxy Adhesive highly toughened for metal to metal and composite bonding. It is a one part 100% solids thermosetting paste adhesive offering the following advantages: Exceptionally high shear and peel strength at service temperatures between -55 C and +120 C. Can be cured at temperatures as low as 100 C. Non-sag properties prevent run-off from vertical surfaces during the cure. The viscosity of the product frequently allows accurate positioning and the ability to move assembled components before cure without risk. Excellent resistance to high humidity and many aggressive environments. Physical Properties Base Specific Gravity 0.95 Toughened Epoxy Resin Consistency Heavy Paste (non-sag) Solids 100% Viscosity at 25 C Colour Shelf Life 1200 pa (1,200,000 cp) Translucent light tan 12 months from date of despatch by 3M when stored in the original carton at 21 C (70 F) & 50 % Relative Humidity Performance Characteristics This product has been widely used in applications requiring very high impact resistance and external durability. Typical European applications include bonding aluminium stiffeners to roadsigns and assembly of bicycle frames. The high peel strength of the product will allow effective use in collapsible impact structures. All data reported in this section was obtained under standard laboratory conditions using 25 psi (170KPa) bonding pressure applied by press and cured for 60 minutes at 120 C.

2 2 Performance Characteristics (Cont...) Overlap Shear Strength on Aluminium: Typical values on FPL etched aluminium, samples were 25mm x 12.5mm overlap cut from 1.6mm thick x 180mm bonded panels of 2024T3 clad aluminium. Tests were conducted according to pr EN Test Temperature ( C) Shear (MPa) Strength (psi) T-Peel Strength to Aluminium: Specimens were prepared from 0.5mm thick FPL etched 2024T3 clad aluminium from which 25mm strips were cut for testing. Test Temperature ( C) N/cm (piw) (34) (53) (46) Environmental Resistance: High Humidity: The product has been used in many external applications covering most European climatic conditions for at least seven days. Shear Strength (MPa) Temp ( C) Therefore, we have a high level of confidence in the external durability of this product on well prepared surfaces. Listed below are some accelerated tests performed on this system Control Immersed* * Bonded strength after 750 h (1 month approximately) immersion at 70 C, 95% RH. Condition: Etched and Primed Aluminium Bond Strength (MPa) Control Heat Soak 1000h immersion 23 C, 50% RH 2000h (83 days) at 80 C Water at RT* JP4 (Jet Fuel) at RT Water plus 3% MaC1 at RT Hydraulic oil at RT Skydrol 500B at 70 C * RT stands for Room Temperature typically 23 C +/- 2 C

3 3 Additional Product Information Cure Cycle Pressure Temperature Time Only sufficient pressure to ensure alignment of parts (In most of our tests 25 psi (170 KPa) was used. Temperatures above 100 C cure the product to a high strength solvent resistant bond. For optimum results a cure temperature of 120 C id recommended. This depends on the cure temperature used, the method of heat application, production laminations and bond properties required. The following cure temperature/times are suggested: 100 C 180 minutes 120 C 60 minutes Storage Conditions 9360 should be stored at -18 C or lower. After extended storage the product will gradually increase in viscosity. This does not adversely affect adhesion or the mechanical properties. Allow the adhesive to warm to room temperature before opening sealed containers. This is important to prevent moisture condensation. Shelf life is 5 days at room temperature, 30 days at 4 C and 6 months at -18 C. Health and Safety Information Precautions: Harmful if swallowed. Irritating to eyes and skin. May cause sensitisation by skin contact. Avoid contact with skin and eyes. Wear suitable gloves and eye/face protection. Use only in well ventilated areas. Avoid inhalation of dust when grinding or cutting. When using do not eat or drink. Launder contaminated clothing before re-use. First Aid: Eye Contact: Rinse immediately with plenty of water and seek medical advice. Skin Contact: Wash immediately with plenty of soap and water. For further Health & Safety information, please contact our Toxicology Department on Bracknell (0344)

4 4 Directions for Use 9360 Adhesive can be applied by extruding in place using simple pumping equipment, or applied by spatula or notched trowel. After application of the adhesive, assemble the joints as soon as possible. Exposure of the adhesive for prolonged periods to humidities of 50% or higher can result in the adhesive absorbing moisture from the atmosphere. This can result in the formation of a blown or porous bond during care. Surface Preparation: Surfaces must be clean and grease free. Any surface preparation should be fully evaluated together with the adhesive, particularly where exposure to aggressive environments are anticipated. Additional advice on surface preparation is available from the 3M Customer Technical Centre in Bracknell. Metals and Composites: Abrade surfaces to be bonded with fine sandpaper or 3M Scotch-Brite 7447 Heavy Duty Scouring Pad. Gritblasting with aluminium oxide grit is a good method for steel. Primers can improve performance. Wipe with a clean cloth or paper towel soaked in appropriate solvent until no further transfer of colour or debris. Thoroughly dry surface before adhesive application. Aluminium: A range of surface preparation methods is available. Chemical treatments including acid etching, anodising and conversion coating techniques offer the best environmental resistance. A range of promoting and corrosion inhibiting primers is available from 3M. These will allow a high level of surface preparation to be followed by priming to allow prolonged storage of prepared surfaces before bonding. For structures requiring prolonged wet exposure, surface preparation by abrasion and use of Scotch- Weld 3901 adhesive primer for corrosion inhibiting and adhesion promotion will give good performance. We advise that adhesive application and joint completion should normally take place within 4 hours after chemical conversion abrasion. To extend this period a corrosion inhibiting primer should be used. Such primers can be sprayed over the whole component to act also as a corrosion inhibiting primer for subsequent painting. Suitable primers include 3M types 3901, 3909 and Clean Up: Excess adhesive and contaminated equipment may be cleaned up prior to curing with a ketone solvent (eg 3M Solvent No. 2) NOTE: 3M Solvent No. 2 is flammable. When using solvents for clean up, it is essential that proper safety precautions be observed. Examine appropriate Health and Safety Data Sheets. 3M and Scotch are trademarks of the 3M Company. Values presented have been determined by standard test methods and are average values not to be used for specification purposes. Our recommendations on the use of our products are based on tests believed to be reliable but we would ask that you conduct your own tests to determine their suitability for your applications. This is because 3M cannot accept any responsibility or liability direct or consequential for loss or damage caused as a result of our recommendations. Tapes & Adhesives 3M United Kingdom PLC M United Kingdom PLC 3M House, 28 Great Jackson Street, Manchester, M15 4PA Customer Service : Tel [3MUKP1] Fax M Ireland 3M House, Adelphi Centre, Upper Georges Street, Dun Laoghaire,Co. Dublin, Ireland Customer Service : Tel (01) Fax (01)

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