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Loctite 5970 RTV #5203499 09/03/19 09:34 AM
Joined: Aug 2004
Posts: 21,162
The Critic Offline OP
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This is kind of a silly post. I apologize in advance.

Most of the Euro OEM’s call for this RTV on timing covers and oil pans. I recently used the product to reseal an upper timing cover on a C250 and an oil pan on a C300 without issues.

However, I found this RTV to be “weaker” than Toyota FIPG Black or HondaBond HT. After curing, it is more easily removable from surfaces than I expected. If I leave a bead of 5970 squeezed out of the applicator nozzle (so that I can reuse the nozzle for the next use), this rtv is so soft that the bead will just fall out of the nozzle.

Yes, I verified that both tubes were not expired.

I am not used to working with RTV that displays these properties. Is this normal for Euro RTV’s?

https://dm.henkel-dam.com/is/content/henkel/12990_Henkel-SellSheet-Loctite-5970-EN-28_9_15pdf

(Note about the picture: When I ordered Loctite 5970 from SSF, they sent a tube that was sold under the MB label.)

B7A3E90D-990C-46E3-9EC4-590256B4B989.jpeg099EDDC6-EB0B-44F2-9FFD-C6878CFDA013.jpeg
Last edited by The Critic; 09/03/19 09:37 AM.

2011 Toyota Prius 1.8L - 198K - Pennzoil Platinum 0W-20
2007 Honda Accord 2.4L - 139K - Valvoline Premium Blue Restore 10W-30
Re: Loctite 5970 RTV [Re: The Critic] #5203616 09/03/19 12:34 PM
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The_Eric Offline
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I've seen a similar product in powersports engines - usually 3 Bond of some kind and it always seems to work okay. As long as the surfaces are rigid and clean, you'll be fine.


2005 Lincoln Aviator 4.6 DOHC
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2001 Hyundai Elantra 2.0
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Re: Loctite 5970 RTV [Re: The Critic] #5204078 09/03/19 10:06 PM
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clinebarger Offline
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You need a stick of dynamite to get parts separated when using Toyota FIPG Black....Assuming everything is cleaned & prepped well.

Sounds like a softer "Packing".....Which is fine if it works well at it's intended usage. Some of these parts expand & contract with heat cycles thus the need for packing to be more pliable.


2001 Chevy Camaro L92/4L80E
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Re: Loctite 5970 RTV [Re: The Critic] #5204091 09/03/19 10:27 PM
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red7404 Offline
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i like permatex # 2. i found RTV wants to slide around be for it sets.

Re: Loctite 5970 RTV [Re: The Critic] #5204127 09/04/19 12:10 AM
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Mad_Hatter Offline
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Originally Posted by The Critic

However, I found this RTV to be “weaker” than Toyota FIPG Black or HondaBond HT. After curing, it is more easily removable from surfaces than I expected. If I leave a bead of 5970 squeezed out of the applicator nozzle (so that I can reuse the nozzle for the next use), this rtv is so soft that the bead will just fall out of the nozzle.

The applicator plastic used is designed to resist adhesion for starters and Loctite 5970 uses a unique type of silicone designed to provide better flexing performance (where movmt, even micro movmt, between the two parts is of particular concern) over traditional silicone RTV's, so it doesn't cure as rigid as something like a Permatex blk/gry.

Re: Loctite 5970 RTV [Re: clinebarger] #5204143 09/04/19 01:38 AM
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The Critic Offline OP
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Originally Posted by Mad_Hatter
Originally Posted by The Critic

However, I found this RTV to be “weaker” than Toyota FIPG Black or HondaBond HT. After curing, it is more easily removable from surfaces than I expected. If I leave a bead of 5970 squeezed out of the applicator nozzle (so that I can reuse the nozzle for the next use), this rtv is so soft that the bead will just fall out of the nozzle.

The applicator plastic used is designed to resist adhesion for starters and Loctite 5970 uses a unique type of silicone designed to provide better flexing performance (where movmt, even micro movmt, between the two parts is of particular concern) over traditional silicone RTV's, so it doesn't cure as rigid as something like a Permatex blk/gry.

Originally Posted by clinebarger
You need a stick of dynamite to get parts separated when using Toyota FIPG Black....Assuming everything is cleaned & prepped well.

Sounds like a softer "Packing".....Which is fine if it works well at it's intended usage. Some of these parts expand & contract with heat cycles thus the need for packing to be more pliable.

Interesting - thanks guys.


2011 Toyota Prius 1.8L - 198K - Pennzoil Platinum 0W-20
2007 Honda Accord 2.4L - 139K - Valvoline Premium Blue Restore 10W-30
Re: Loctite 5970 RTV [Re: The Critic] #5204199 09/04/19 05:28 AM
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Mad_Hatter Offline
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Originally Posted by The Critic

Interesting - thanks guys.

NP... that 5970 is good stuff. I'll have to keep it in mind the next time I need an rtv.

Re: Loctite 5970 RTV [Re: The Critic] #5232934 10/07/19 12:50 PM
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The Critic Offline OP
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I have an extra tube of this stuff that is brand new. Does anyone want it?


2011 Toyota Prius 1.8L - 198K - Pennzoil Platinum 0W-20
2007 Honda Accord 2.4L - 139K - Valvoline Premium Blue Restore 10W-30
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