LONG WORKING LIFE, EPOXY STRUCTURAL ADHESIVE
METREGRIP 355 is a NEW, low viscosity, high bond strength epoxy adhesive developed for general purpose applications. It is easy to use: Mix one part activator with 2 parts adhesive base – spread on only one surface – put parts together with simple contact – squeeze out excess – and that’s it!
METREGRIP 355 will set overnight, and yet the working life of 1/4 lb. batch is 4 hours. (Approx. 2 hours for a 1 lb. batch). For more rapid setting, 30 minutes at about 150°F will do it.
METREGRIP 355 will bond to almost any surface and produces a resilient and tenacious, water-proof, chemically resistant joint.
DIRECTIONS FOR USE
Surface Preparation
For maximum adhesion, surfaces should be clean and dry. Refer to Technical Service Bulletin No. 3-626, “Preparation of Surfaces for Bonding”. For release or masking, use META-PART 7582.
GENERAL PURPOSE WORK
Mix thoroughly one part activator with two parts adhesive base until the haziness clears. In 1/4 lb. batches, the mixture has a working life of at least 4 hours. To flexibilize METREGRIP 355, add more activator to the adhesive base. Mixing ratio is non-critical, and therefore, METREGRIP 355 is not sensitive to operational errors.
Apply METREGRIP 355 by any common method, such as brush, roller coater, doctor blade, or drop from dispenser. Glue line thickness is not critical, although higher strengths are obtained with thick glue lines. Place parts together; clamping is not necessary unless the parts will shift and keep overnight until bond sets. (A heat lamp will set bond in 15 minutes.)
TYPICAL BOND STRENGTHS
Tensile shear strengths, psi. (obtained after curing 5 days at room temperature)
| Steel to Steel | 2700 |
| Aluminum to Aluminum | 2600 |
| Brass to Brass | 1900 |
| Copper to Copper | 1200 |
| Wood to Steel* | 1600 |
*(failure in wood)
TYPICAL PROPERTIES OF METREGRIP 355
Unmixed Components Appearance
| Part A, Activator | Part B, Base | |
| Appearance | Amber | Clear |
| Physical Form | Liquid | Syrup |
| Viscosity (125°C, Brookfield cps) | 300 | 7000 |
CURED METREGRIP 355 PROPERTY
| Property | Test Method | Value |
| Appearance | Visual | Transparent Straw Solid |
| Specific Gravity, 25°C | ASTM-D792 | 1.2 |
| Flexural Strength, ultimate | ASTM-D796 | 50,000 |
| Tensile Elongation (%) | D638 | 6.4 |
| Safe Operating Temperature, °C | PROTAVIC | -60 to 145 |
| Dielectric Strength (V/mil) | ASTM-D149 | 425 |
| Volume Resistivity (ohm/cm) | ASTM-D257 | 3.1 x 1015 |
| Dielectric Constant, 103 cycles | ASTM- D150 | 3.57 |
| Power Factor, 103 cycles | ASTM-D150 | 0.01 |
| Water Absorption (%) | —— | 0.21 |
| Heat Distortion Temperature (°F) ASTM-D648 | ASTM-D648 | 153 |
| Impact Resistance, Izod (ft.-lbs./in/notch) | ASTM-D256 | 0.55 |
| Uniaxial Tensile Tests @ 2.0 ipm and 72 ºF | ASTM-D638 | |
| Modulus (ksi) | 416 | |
| Poisson’s Ratio | 0.35 | |
| Strength (psi) | 5,180 | |
| Elongation % | 1.5 | |
| Tg ºF DSC | 145 | |
| Tg ºF DMA | 164 | |
| CTE (in/in/oF) | 45 x 10-6 | |
| Wt. Loss (24 hrs. at 300°F) | —— | 0.64 |
CLEAN-UP
METATERGE 1405 is recommended to replace hazardous solvents for general clean-up. METATERGE 1405, a unique water soluble resin detergent, dissolves uncured resin systems and renders them water compatible. Soiled equipment, tools or bench areas can then be simply cleaned with a wet sponge or shop rag. Refer to Data Bulletin for details.
METASTRIP 701 is an effective non-corrosive stripping solvent for removing cured epoxy resins to salvage valuable electronic components. Refer to Data Bulletin for details.
METASTRIP 705, a highly active epoxy remover formulated for vigorous stripping of more chemically resistant cured encapsulating compounds, is more active and requires careful handling. Refer to Data Bulletin for details.
Technical information and recommendations made by Protavic America, Inc. concerning products and uses or applications thereof, are based on reliable laboratory tests and are believed to be accurate. No warranty, however, is expressed or implied, nor is any warranty expressed or implied as to results to be obtained from use of said materials, whether used singly or in combination with other products. No statements made are to be construed as constituting a license under any existing patent.