Bond glue issues and pictures

[Punter]

I've had many run-ins with the japanese glue. When it's new it looks very much like run-of-the-mill contact adhesive that you would use to glue cork tiles to the floor with. Whatever the chemical composition, it's amazing to see how it ages and that it transmogrifies into an evil corrosive, conductive compound. Considering how it's utilised, it's very ill suited to the job! To add insult to injury, there's no real reason (apart from the transport issue mentioned by John) to apply it to caps or any other electronic component in domestic HiFi gear that's gong to spend most of it's life sitting in one place. They also, demonstrably, splosh it on pin headers and connectors to keep them in place, no doubt so that any vibration doesn't have the potential to mouse the connector off the header, however, the bulk of those type of devices have some form of tab or overpress feature intended to obviate that problem. Alli n all, it's overkill and unfortunately, a measure that can unnecessarily shorten the operational life of a piece of gear.

Excellent post restorer-john

 

[Doodski]

I've had many run-ins with the japanese glue. When it's new it looks very much like run-of-the-mill contact adhesive that you would use to glue cork tiles to the floor with. Whatever the chemical composition, it's amazing to see how it ages and that it transmogrifies into an evil corrosive, conductive compound. Considering how it's utilised, it's very ill suited to the job! To add insult to injury, there's no real reason (apart from the transport issue mentioned by John) to apply it to caps or any other electronic component in domestic HiFi gear that's gong to spend most of it's life sitting in one place. They also, demonstrably, splosh it on pin headers and connectors to keep them in place, no doubt so that any vibration doesn't have the potential to mouse the connector off the header, however, the bulk of those type of devices have some form of tab or overpress feature intended to obviate that problem. Alli n all, it's overkill and unfortunately, a measure that can unnecessarily shorten the operational life of a piece of gear.

Excellent post restorer-john

A manufacturer has provided information on the capacitors and components that are coming loose in shipping and stated that is why they use the stuff now more than before. More than a couple of manufacturers have had issues by not using the adhesive stuff. There is better stuff than contact cement.

 

[restorer-john]

A manufacturer has provided information on the capacitors and components that are coming loose in shipping and stated that is why they use the stuff now more than before. More than a couple of manufacturers have had issues by not using the adhesive stuff. There is better stuff than contact cement.

There's a bunch of reasons and they're mainly to do with cost cutting (isn't it always).

Capacitors have become smaller and cheaper in construction, weigh less, and PCB mounting means there is little or no mounting strength. So, they pour silicone/glue or whatever around them instead of proper steel chassis mounts from the past. They rely on the solder joint and that is also PbFree...

Not only that, packaging has become so "eco" and "green" that it barely protects the products inside when subject to normal poor transport handling.

Perreaux's famous ad where Peter Perreaux dropped his 20kg amp off the factory roof and it survived. Try that with modern gear.

 

[Doodski]

I've had many run-ins with the japanese glue.

Firstly the glue is not of any nationality. LoL... Too Funny!

Capacitors have become smaller and cheaper in construction, weigh less, and PCB mounting means there is little or no mounting strength. So, they pour silicone/glue or whatever around them instead of proper steel chassis mounts from the past. They rely on the solder joint and that is also PbFree..

The same old 1000 micro Farad caps are about the same old size. Just enough mass to get enough G forces and come out of the holes. The class D stuff coming is supposed to be anti-vibe, anti-G, anti-loose caps/components. We'll see.