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InvisibleGrumio

Registered: 10/18/19
Posts: 126
Epoxy on SFD's instead of RTV Silicone
    #26447773 - 01/23/20 07:54 AM (4 years, 6 days ago)

Has anybody tried fixing SFD circles to grain jar lids with a 2 part epoxy instead of RTV silicone?

I don't really like RTV as a slight pull and it comes off with the SFD circle.

Was thinking a proper hardened epoxy would be more solid and sturdy over time. It says on the tube its good for over 550f so should be fine in a presure cooker.

https://www.amazon.co.uk/JB-WELD-MAC8265-S-TEX-8265-S-Weld/dp/B0006O1ICE/ref=sr_1_2?keywords=jb+weld+epoxy&qid=1579791186&sr=8-2


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Offlineiwh678
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Re: Epoxy on SFD's instead of RTV Silicone [Re: Grumio]
    #26447806 - 01/23/20 08:41 AM (4 years, 6 days ago)

From the JB Weld website"J-B Weld™ has a tensile strength of 5020 PSI and sets to a hard bond overnight. It can withstand temperatures up to 550ºF when fully cured."
So it might work.

Unless someone else comes along that has tried, the only way to know is give it try your self.


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OfflineA.k.aM
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Re: Epoxy on SFD's instead of RTV Silicone [Re: iwh678]
    #26447812 - 01/23/20 08:46 AM (4 years, 6 days ago)

Scuffing the lid with sandpaper is supposed to help a lot with silicone, never tried it myself though I got enough tyvek to last a long time when I first started.


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InvisibleSmartattack
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Re: Epoxy on SFD's instead of RTV Silicone [Re: A.k.a]
    #26447824 - 01/23/20 09:00 AM (4 years, 6 days ago)

The heating and cooling is going to make it come off likely. The metal and epoxy expand and contract different plus epoxy typically doesn't like to flex a lot if it's just typical 2 ton or 5 min stuff.

Just don't use glue on filters for GE. Holes plugged with poly are 100% effective and can last dozens of cycles before needing another 10 seconds of re stuffing with $.0001 poly.:shrug:


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OfflineThe Mycologist
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Re: Epoxy on SFD's instead of RTV Silicone [Re: Grumio]
    #26447830 - 01/23/20 09:03 AM (4 years, 6 days ago)

I do the more expensive super easy tek.


Buy sfd's, one per jar. Put two small holes in a number of jar lids, put jar down with lid on top, then sfd on top of that, then ring to seal it all up.


--------------------
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InvisibleGrumio

Registered: 10/18/19
Posts: 126
Re: Epoxy on SFD's instead of RTV Silicone [Re: The Mycologist]
    #26447874 - 01/23/20 09:40 AM (4 years, 6 days ago)

I'm gonna give it a go and pressure cook some empty jars just to see how it stands up.

Moving onto plastic 1 part lids so hopefully I can make nice circles of the sfd's and epoxy to the lid so it looks nice and clean finish rather than splodgy rtv or polyfill (just don't like the stuff).

thanks,


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Offlinesonoramo
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Re: Epoxy on SFD's instead of RTV Silicone [Re: Grumio]
    #26447877 - 01/23/20 09:40 AM (4 years, 6 days ago)

I've tried both and I like silicone much better. Epoxy is harder to manage and clean up, and it tends to be runny before it sets, then brittle when it does set. When I use silicone, its higher viscosity makes it easier to get a uniform seal to the lid. I let it ooze over the edge of the hole a bit, then smooth it with a finger or a putty knife. Also, smooth it onto the filter side as well, so there's a large contact area.

I've made a lot of jar lids this way and never had a patch pull off.


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OfflinePrietenul
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Re: Epoxy on SFD's instead of RTV Silicone [Re: Smartattack]
    #26447898 - 01/23/20 09:54 AM (4 years, 6 days ago)

Quote:

Smartattack said:
The heating and cooling is going to make it come off likely. The metal and epoxy expand and contract different plus epoxy typically doesn't like to flex a lot if it's just typical 2 ton or 5 min stuff.

Just don't use glue on filters for GE. Holes plugged with poly are 100% effective and can last dozens of cycles before needing another 10 seconds of re stuffing with $.0001 poly.:shrug:





As I understood it (read something around here but don't remember where), poly is not a filter. It's just to keep drops of water out of the jar, but it is not a filter for keeping contamination out.


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OfflineSFS96
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Re: Epoxy on SFD's instead of RTV Silicone [Re: Prietenul] * 1
    #26447977 - 01/23/20 10:50 AM (4 years, 6 days ago)

How is it not a filter? Many people just use Polyfil to stuff jar lids without contamination so it has to be filtering. I prefer whole SFDs under plastic pp5 lids. It’s expensive but I won’t go back.


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OfflinePrietenul
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Re: Epoxy on SFD's instead of RTV Silicone [Re: SFS96]
    #26448112 - 01/23/20 12:23 PM (4 years, 6 days ago)

I didn't say it wouldn't work with polyfill, just said that polyfill is not a filter in itself. I would bet my right ball, that a 0.2 micron filter is superior if it comes to filtering contamination (because that's what it was made for).

Of course I'm not the most experienced member on the board... But I bought SFDs to be 100% sure and they haven't let me down. Also, as long as you don't pierce them, you can reuse them forever.


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InvisibleSmartattack
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Re: Epoxy on SFD's instead of RTV Silicone [Re: Prietenul]
    #26448233 - 01/23/20 01:46 PM (4 years, 6 days ago)

I'm taking your right ball then.


I'm hundreds of jars deep in minimal contam (and none due to poly). You don't just twist some into the hole. You strong arm it through with an arbor of sorts so it forms a hard button. Id put it up against anything for filtration. Contams would have to go through 3/4" of densely packed fiber.


--------------------
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Edited by Smartattack (01/23/20 02:47 PM)


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Offlineiwh678
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Re: Epoxy on SFD's instead of RTV Silicone [Re: Smartattack]
    #26448320 - 01/23/20 02:20 PM (4 years, 6 days ago)

If I had to guess its less about the size of the pores in pollyfill and more about the complex path a particle would have to travel to get through it.

Pasteur proved this with flasks that had horizontal S shaped necks


Edited by iwh678 (01/23/20 02:21 PM)


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OfflinePrietenul
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Re: Epoxy on SFD's instead of RTV Silicone [Re: Smartattack]
    #26448394 - 01/23/20 02:54 PM (4 years, 6 days ago)

Quote:

Smartattack said:
I'm taking your right ball then.


I'm hundreds of jars deep in minimal contam (and none due to poly). You don't just twist some into the hole. You strong arm it through with an arbor of sorts so it forms a hard button. Id put it up against anything for filtration. Contams would have to go through 3/4" of densely packed fiber.




Well, then what can I say? I have no scientific proof to back my claim, so maybe you're right. Just wanted to give my best opinion...

Btw. I lied regarding my right ball so...sorry to disappoint you :lol:


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InvisibleSmartattack
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Re: Epoxy on SFD's instead of RTV Silicone [Re: Prietenul]
    #26448423 - 01/23/20 03:11 PM (4 years, 6 days ago)

I guess I'll make due without.


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OfflineSpirit-Crusher
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Registered: 04/24/19
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Re: Epoxy on SFD's instead of RTV Silicone [Re: Grumio]
    #26448448 - 01/23/20 03:31 PM (4 years, 6 days ago)

Quote:

Grumio said:
Has anybody tried fixing SFD circles to grain jar lids with a 2 part epoxy instead of RTV silicone?

I don't really like RTV as a slight pull and it comes off with the SFD circle.

Was thinking a proper hardened epoxy would be more solid and sturdy over time. It says on the tube its good for over 550f so should be fine in a presure cooker.

https://www.amazon.co.uk/JB-WELD-MAC8265-S-TEX-8265-S-Weld/dp/B0006O1ICE/ref=sr_1_2?keywords=jb+weld+epoxy&qid=1579791186&sr=8-2


I actually created a thread about this the other day. Made about 100 jar lids using JB weld high temp. It seems like a lot of it wicked up into the SFD thus choking off the jar. I got decent results but some jars of the same mycelium took SO LONG to finish.


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InvisiblebodhisattaMDiscordReddit
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Re: Epoxy on SFD's instead of RTV Silicone [Re: iwh678]
    #26448563 - 01/23/20 04:38 PM (4 years, 6 days ago)

Quote:

iwh678 said:
If I had to guess its less about the size of the pores in pollyfill and more about the complex path a particle would have to travel to get through it.

Pasteur proved this with flasks that had horizontal S shaped necks




The pores in a 99.99% 0.3 micron hepa are far larger than 0.3 microns. They do not work like a sieve at all.


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OfflinePrietenul
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Re: Epoxy on SFD's instead of RTV Silicone [Re: bodhisatta]
    #26448594 - 01/23/20 04:57 PM (4 years, 6 days ago)

So you would also say, that SFDs have no different effect than Polyfill, did I get that right?


Edited by Prietenul (01/23/20 05:00 PM)


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Invisiblegizmo1
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Re: Epoxy on SFD's instead of RTV Silicone [Re: Prietenul]
    #26448683 - 01/23/20 05:42 PM (4 years, 6 days ago)

Quote:

Prietenul said:
So you would also say, that SFDs have no different effect than Polyfill, did I get that right?



They both keep a vacuum from being formed during sterilization and provide sufficient GE what do more or less would you expect from either? SFDs aren't superior in filtering just because they are more expensive but they are convenient. :shrug:

Idk where you read that poly isn't a filter and just keeps water droplets out but that sounds like some dated info. It definitely serves as a filter in our case. Serves its purpose just as well as an SFD.


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OfflinePrietenul
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Re: Epoxy on SFD's instead of RTV Silicone [Re: gizmo1]
    #26448718 - 01/23/20 05:55 PM (4 years, 6 days ago)

Yeah, understood. Good to know.


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Offlineiwh678
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Re: Epoxy on SFD's instead of RTV Silicone [Re: bodhisatta]
    #26448735 - 01/23/20 06:05 PM (4 years, 6 days ago)

Quote:

bodhisatta said:
Quote:

iwh678 said:
If I had to guess its less about the size of the pores in pollyfill and more about the complex path a particle would have to travel to get through it.

Pasteur proved this with flasks that had horizontal S shaped necks




The pores in a 99.99% 0.3 micron hepa are far larger than 0.3 microns. They do not work like a sieve at all.




The more you know!

So looked it up and they actually work in similar function as the diagram, but a more complex and on a much smaller scale. The SFD work similarly as well?


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OfflineMrBovineJoni
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Registered: 11/28/19
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Re: Epoxy on SFD's instead of RTV Silicone [Re: gizmo1]
    #26448740 - 01/23/20 06:07 PM (4 years, 6 days ago)

Good quality SFD if used properly will literally last for hundreds of cycles (whole or cut in for one of the lid TEKs). Make the lids once and forget.

Polyfil tends to deteriorate quicker - shit can get stuck on the inside of the jar and generally you need to maintain it and replace it once in a while (SFDs definitely last much longer). Experienced cultivators here use both to great success but polyfil is certainly much cheaper to buy/use/replace...and in theory may need more maintenance.


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Offlineshevanel
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Re: Epoxy on SFD's instead of RTV Silicone [Re: MrBovineJoni]
    #26448814 - 01/23/20 06:42 PM (4 years, 6 days ago)

Been using poly for 12 years. 99% success rate.

I am trying to evolve though and actually ordered some rtv, 29mm SFD and pp5 lids to give them a try.

Something new to do perhaps


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