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Go Back   SailNet Community > On Board > Gear & Maintenance > Rebedding in the rain?
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Thread: Rebedding in the rain? Reply to Thread
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Topic Review (Newest First)
10-31-2008 11:39 AM
GBurton Well.... I applied some polysulphide to a piece of plexiglass that I have in my office a week or so ago.

It has not "eaten" or even discolored the plex. So there you have it....
10-09-2008 07:16 AM
catamount
Quote:
Originally Posted by poopdeckpappy View Post
Question, if you used a adhesive/sealant with a 1000psi break point on stanchions or chain plates that where also though bolted, why would the elasticity be a factor
Let's further qualify that by saying a properly designed and fabricated stanchion base or chainplate, through-bolted to a properly reinforced section of deck or hull, with a proper backing plate...
10-09-2008 01:04 AM
poopdeckpappy You bet, thanks for your opinion on that data


Question, if you used a adhesive/sealant with a 1000psi break point on stanchions or chain plates that where also though bolted, why would the elasticity be a factory
10-09-2008 12:41 AM
Maine Sail
Well...

yes and I clearly could not find that data on the site. Polysulfides generally have lower elongation at break than do polyurethanes. 3M 101 Polysulfide is half as flexible as 5200 at 416% but even the best of this stuff is half of 3M 101 Polysulfide. 50% elongation before break is not enough IMHO on boat for bedding stanchions or chain plates. I have seen the stainless steel plate on some stanchions flex as much as 1/16" of an inch. If you have a 1/32" layer of sealant 50% does not satisfy this type of flex and it will likely fail. My bottom number that I'm comfortable with is around 300-350%.

I'd love to find a polysulfide with 600-800% elongation before break but that still had a low 140 PSI adhesion!! The only draw back to polysulfides is their restricted, compared to polyurethanes, elongation before break.

Thanks for that data..!
10-09-2008 12:39 AM
poopdeckpappy Here's a similar/dissimilar substrat chart


http://www.masterbond.com/sg/masterbond_substrat.pdf
10-09-2008 12:06 AM
poopdeckpappy Does any of the above help ??

tensile break is 1000psi, and elongation (%) is 50 for EP21TP-2

tensile break is 250-270psi and elongation(%) is 230 for EP21TPFL-1
10-09-2008 12:02 AM
poopdeckpappy
EP21TPFL-1fficeffice" />>>

> >

> >

> >

Substrate Compatibility >>

CeramicGlass; ConcreteMasonry; Metal; Plastic; Porous Surfaces; Rubber or Elastomer; Wood; Dissimilar Substrates; Metal/Plastic/Glass/Ceramic/Elast.&Wood >>

Industry >>

Aerospace; Automotive; Electronics; Electrical Power or High Voltage; Marine; Military; OEM or Industrial; Semiconductors or IC Packaging; Chemical/Oil Processing/Metal Working >>


Material Properties (Nominal / Typical) >>


>>

Process & Physical >>

> >

Viscosity (cP) >>

> >

Gap Fill (inch) >>

> >

Thermal >>

> >

Use Temperature (F) >>

-65 to 250 >>

Thermal Conductivity (W/m-K) >>

0.2880 to 0.4320 >>

CTE (µin/in-F) >>

39 to 50 >>

Mechanical >>

> >

Tensile (Break) (psi) >>

250 to 270 >>

Elongation (%) >>

230.0 >>

Electrical >>

> >

Resistivity (ohm-cm) >>

1.00E12 >>

Dielectric Strength (kV/in) >>

360 to 450 >>

Dielectric Constant >>

6.80 >>

Optical >>

> >

Index of Refraction >>

> >

Transmission (%) >>

>>

> >
>>
EP21TP-2>>

>>

Substrate Compatibility >>

CeramicGlass; ConcreteMasonry; Metal; Plastic; Porous Surfaces; Rubber or Elastomer; Wood; Dissimilar Substrates; Metal/Plastic/Glass/Ceramic/Elast.&Wood >>

Industry >>

Aerospace; Automotive; Electronics; Electrical Power or High Voltage; Marine; Military; OEM or Industrial; Semiconductors or IC Packaging; Chemical/Oil Processing/Metal Working >>


Material Properties (Nominal / Typical) >>


>>

Process & Physical >>

> >

Viscosity (cP) >>

5000 to 6000 >>

Gap Fill (inch) >>

> >

Thermal >>

> >

Use Temperature (F) >>

-100 to 300 >>

Thermal Conductivity (W/m-K) >>

0.2880 to 0.4320 >>

CTE (µin/in-F) >>

39 to 50 >>

Mechanical >>

> >

Tensile (Break) (psi) >>

> >

Elongation (%) >>

50.0 >>

Electrical >>

> >

Resistivity (ohm-cm) >>

1.00E12 >>

Dielectric Strength (kV/in) >>

360 to 450 >>

Dielectric Constant >>

4.00 >>

Optical >>

> >

Index of Refraction >>

> >

Transmission (%) >>

>>


>>
10-08-2008 09:34 PM
Maine Sail
Now I understand..

Now I understand why they have a 1000 PSI rating. It's not solely a Polysulfide but rather a Polysulfide/epoxy hybrid mix with added epoxy.

The added epoxy is clearly where it gets it's 1000 PSI rating from. I'd like to see some elongation before break numbers but they don't give the data on the site. Have you asked them about elongation before break numbers??

It does seem a little too permanent for bedding and with the epoxy I would not guess it can match the flexibility of a straight Polysulfide but you never know. 3M 101 is roughly 416% elongation before break..
10-08-2008 07:35 PM
poopdeckpappy Master Bond Products by Type


I stumbled across them though my work in the construction industry and goofing with offroad vehicles , not that this means anything, it's just how I found them
10-08-2008 07:31 PM
poopdeckpappy MS, I did not intended to be disrespectful to you or SD, I hold SD & your knowledge of such things in high regard.


Master Bond is manufactured in Hackensack, New Jersey and you buy direct though them.

They have 2 polysulfades adhersive/sealants that I know of ( maybe more ) that are rated for marine use along with auto & aerospace

One is EP21TP-2 and the other is EP21TPFL-1, neither of these could be found at the local chandlery on a Saturday morning but, if your project is planned in advance and you want to use the best possible products, they can be had.

Also, if the consumer does not know what to use, he/she could call them, tell them what you're doing, with what material(s), in what environment and they will tell you the best product to use
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