Resin Technical Specifications

[SGT]

Over the years I have posted my feelings on the importance of knowing the specifications/ physical properties of cured and uncured resin. In recent threads there has been some posting about this subject and I thought it might be interesting for us to share with each other the brand we use and specifications and put it on the table for all to compare in an open setting. If you don't have them try to get them if they will supply them. Lets see at least on paper how our resin preference's stand up to each other.

I use Delta Resins:

144-8 Windshield Repair Resin Specifications (Magna Bond)
144-8 MagniBond Resin is a very low viscosity general purpose windshield repair adhesive.
Viscosity: 15-20 CPS
Refractive Index (Uncured adhesive): 1.519
Film Tensile Strength: 2000 PSI
Adhesive tensile on Glass: 1800 PSI
Shore Hardness: D75

144-1 Windshield Repair Resin Specifications
144-1 is a very low viscosity general purpose windshield repair adhesive.
Viscosity: 14-15 CPS
Refractive Index (Uncured adhesive): 1.4682
Adhesive Sheer Strength: 4300 PSI
Strength after 2 Hr. Boiling Water: 1900 PSI (50% Loss)
Tensile Strength: 1300 PSI
Modulus of Elasticity: 434,000 PSI
Elongation: 0.5%
Linear Shrinkage: 2.5%
Shore Hardness: D60-D80

144-2 Windshield Repair Resin Specifications (Pit Filler)
144-2 is a medium viscosity windshield repair adhesive used for pit filling.
Viscosity: 1600-2200 CPS
Refractive Index (Uncured adhesive): 1.51
Film Tensile Strength: 4200 PSI
Adhesive tensile on Glass: 3200 PSI[/FONT]
Shore Hardness: D75


144-6 Plate Glass Repair Resin Specifications (I use this as pit filler)
144-6 is a high viscosity plate glass repair adhesive.
Viscosity: 3600 CPS
Refractive Index (Uncured adhesive): 1.5064
Film Tensile Strength: 5200 PSI
Adhesive tensile on Glass: 2500 PSI
Shore Hardness: D75

[Brent Deines]

I understand what you mean Blind Squirrel. Heck, I had to take motorcycle safety to get my high school diploma and I almost failed that. Apparently they were not as impressed by my wheelies as I was. Some people have no sense of humor!

Seriously though, I do think the specs matter, but can also be misleading. For instance, many companies report their resins have a very high tensile strength, but fail to specify if that is adhesive tensile on glass, film tensile strength, or some other form of tensile strength. Even the lab that we use for testing fails to provide exactly the same information for every product tested, which is very confusing to say the least. It is also easy to put too much emphasis on one test and ignore all the others. I have said it many times, it's the combination that is important.

Even more to the point, who is to stop a supplier from mis-reporting the specs? The only way to know if we are telling the truth is to send our products to an independent lab and have them tested for yourself. We sometimes do that with competitors products, but then what? Do we sue our competitors for not telling the truth? Even if we did and won, what would we gain from it?

That's why even though the BSI standards are not perfect, they do set a benchmark that is equal and fair to everyone who is willing to foot the bill to be tested. Of course a supplier could lie about that too, which is why we posted our BSI results on line and encouraged other suppliers to do the same. Proof is proof.

I'm not accusing anyone of misrepresenting their products, just pointing out that there are always ways to do so if that is the intent. SGT just about drove me nuts when we first started selling to him, but I certainly respect his attention to detail. I think he is an educated consumer and therefore avoids many of the mistakes that cause others to struggle unnecessarily.

[splitpit]

I agree wit da squirrel! It either works well or it don't.

But I do know about Shore Hardness. When I scrape off the pit, that shore is some hard stuff!

[harrellbenjamin]

I think some techs may have a lot of time on their hands by the length of some of these posts.I am to busy to worry about the "micromanagment"aspect of this very simple process.If it works I use it.If it dont I wont.................K.I.S.S. (KEEP IT SIMPLE STUPID LOL)

[SGT]

Please understand Brian, I appreciate and respect you conscientious approach to this subject. I just posted on another thread how this sort of technical data makes my eyes glaze over.

I have nothing but absolute respect and admiration for aircraft maintenance technicians and the extreme dedication and focus it takes to keep an airplane flying safely.

I'm just at the other end of the spectrum, I failed high school chemistry. All I need to know is that the stuff works consistently where I can sell my windshield repair service with confidence that it won't let me or my customers down.

I truly envy those that can understand this data, and perhaps it would be a good idea to have access to it should a customer inquire about it. I would certainly make it available but would never pretend to understand it.

I guess the fairest question to ask now, how many of you'se guys think it is important to include this information, AND AN UNDERSTANDING OF IT, that is, to be able to communicate coherently about it, in the technical training of windshield repair?

Gary,

Thank you for the kind words but truth be told I certainly am not the sharpest knife in the drawer!!! I barely made it out of high school. I think they pushed me out!!! It certainly was not my intention by creating this thread to have an educated discussion about the chemistry involved with resins as I am not capable of that myself. I thought we could compare all published physical properties to get the big picture from one brand to another. At least on paper.

I certainly agree with you as long as a resin works that is all you should care about but only after you have had real world results with that product. If anyone chooses a big name supplier I am sure they cant go wrong. For myself when I was just looking into the biz and clueless (maybe to some degree I still am clueless about things) about what company to choose with all the hype I felt that the resin performance specs was a good place to start. I felt it was my right to know what I was buying and if they would not provide this data it just made me think why don't they want me to know? Perhaps other potential technicians might be pulling there hair out with what resin to choose and may care about what they are purchasing so there is some benifit to know about what resin you select to start your business.

Just becuase Delta Kits freely supplies that information does not mean that there resins are the best but it does suggest that they want the consumer to be educated and know what they are getting rather than relying on just marketing hype and hersey. That speaks volumes to me at least that they are very confident in there products.

This post was certainly not intended to promote DK but rather promote making an educated choice in whatever brand you choose and leave personal opinion aside. Just so happens I use DK and have had tremendous success and they freely supply this data and it is a DK forum.

[chips1144]

You guys are Great. I appreciate your curiosity, honesty and common sense thinking, its what makes this forum worth reading.