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19. More about the glue we use(?)
19. You want to know more about the type of glue we use.
The glue is a part of the revision. For instance, if you use a strong glue, you run the risk of the glue affecting the foam surround immediately or at a later stage. More importantly, not all glues have the properties this special glue has. The special glue resembles wood glue, but it is markedly different.
Both are water-based glues, but wood glue becomes a lot harder and shrinks a lot more. Both characteristics make wood glue unsuitable for this purpose. The glue needs to follow the movements of the foam. Glue that is too hard will come off. If the glue shrinks too much on the joints between, for instance, cone and foam, it will pull the foam towards it.
The glue we provide is also very strong, a lot stronger than the form itself and it is a water-based glue. This industial glue is especially made for hanging surround surrounds, dust caps, etc.
Audiofriends has conducted extensive tests with various types of glue on difficult surfaces.
Naturally, we also tested the glue on loudspeaker units. In this case, a unit of the most sold speaker in the world, the Bose 301.
Depending on the circumstances, it takes approximately 30 minutes for the glue to become strong enough to be handled safely.
After about 24 hours, the glue is so strong that the foam surround rips apart in case of heavy-handed removal. The glue will not come off. After extensive tests, glue B was chosen from a selection of four different glues.
The following has been taken into consideration (among other things):
1. Process ability
2. Force on various materials after 30 minutes of drying
3. Force on various materials after 24 hours of drying
The glue we use at Audiofriends also adheres very well to plastic. In this case too, the glue is actually stronger than the foam itself.
Our glue has therefore received an excellent independent rating on YouTube. Click for the complete test this hyperlink https://www.youtube.com/watch?v=OF_j-54Zf7U.
Please note: the strength of the glue depends on the use of the glue. The glue should dry a little before mounting the surround on the cone or on the frame. The duration in time of this drying-in depends on the temperature, thickness of the layer, the material of the cone, etc. The applied glue should be approximately 1/3 to 1/2 part transparent. Preferably press firmly. If the glue is used entirely in liquid form, this is possible under certain circumstances.
The drying time becomes longer as less air can reach the glue. Especially in the fairly exceptional case of mounting a rubber edge on a plastic or other hard material other than paper. This is therefore not recommended in most cases, especially with a wide layer of glue.