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2 Ampreg 21-7-1109 Instructions for Use Workshop Conditions Ampreg 21 is optimised for use between 18 - 25°C. At lower temperatures the product thickens and may become unworkable. At higher temperatures working times will be significantly reduced. Maximum relative humidity for use is 70%. Mixing and Handling Ampreg 21 should be mixed at the following ratios: It is important that the resin and hardener components are measured out accurately. Measurement by weight and electronic scales are recommended for this purpose. The two components must be mixed thoroughly. If mixing by hand particular attention should be paid to the side and bottom of the mixing vessel. All solvent free epoxy systems have limited pot- life so use from the pot quickly of transfer to a shallow vessel with large surface area to allow the heat of the resin/hardener reaction to dissipate and prolong the working life of the system. Do not mix more than can be used within the working time of the particular resin/hardener system. Mould Release From smooth metal or grp moulds tests have shown that suitable release can be obtained by use of 5-6 waxings of a carnauba based wax e.g. Polywax. Use PVA for less well prepared or complex surfaces. Whichever mould release is proposed it is recommended that a test laminate is laid up in the mould to be used, with the mould release proposed, in order to ensure an adequate and effective part release. It is recommended to use a high solids sealer such as Chemlease RPM712N (Europe) or MP117 (USA) to seal new moulds, prior to application of the release agent. Application The mixed system is usually applied by foam roller from a roller tray (which also serves to increase exothermic heat release, as described above). High and accurate fibre volume fractions can be obtained by applying known weight of mixed resin / hardener to each fabric / fibre layer. As a general rule of thumb, resin weight per square metre must be no more than, and preferably less than, the area weight of the fabric being wet out. If the laminate is particularly thick, it is recommended that slower hardeners are used for laminating the first layers and faster hardeners in the later layers. In this way the whole thickness laid down remains workable for approximately the same time. For further advice, please contact Gurit Technical Support. Ampreg 21 can be blended with Ampreg Pregel to reduce drainage on vertical surfaces. Please refer to the Ampreg Pregel Technical Datasheet for further information. Bonding Techniques & Peel Ply It is recommended to use nylon peel ply for any secondary bonding applications. Peel Ply is typically used on laminate surfaces which need to be left to cure or partially cure before further laminating or bonding operations. The peel ply serves two functions - preventing the surface from becoming contaminated and / or damaged, and providing a ‘textured’ surface that can reduce the level of preparation required for the secondary laminating or bonding operations. After curing and just prior to bonding, the Peel Ply is stripped off leaving a clean, dust and grease free surface, with an already ‘textured’ surface which makes the ‘keying’ process less time consuming. Gurit recommends the use of its Stitch Ply A peel ply, or suitable Tygavac product. Any proposed peel ply should be tested prior to use to ensure that it not only releases adequately from the laminated surface but also does not leave any residues behind which may impair adhesion. If in doubt please contact Gurit Technical Support. Vacuum Bag Techniques Consolidation of the laminate can be obtained either by hand using paddle rollers or by vacuum or pressure bags. A typical vacuum bag arrangement is shown in figure 1. It is important when using high vacuums and using the slower hardeners that vacuum is not applied until at least 50% into the mixed system working time, as applying the vacuum earlier may result in excessive resin flow and resin starved laminates. For advice on effective vacuum bag consolidation, please contact Gurit Technical Support. Core Materials Gurit supplies Corecell™ SAN closed cell foam for sandwich laminate construction. Other core materials such as PVC foam, Nomex honeycomb and end grain balsa, are also suitable for use with Ampreg 21. For further information on the use of core materials with Ampreg 21, please contact Gurit Technical Support. Figure 1 Hardener Mix ratio (resin:hardener) by weight by volume Fast to Extra Slow 100:33100:38 High Tg 100:29100:34
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