Cotton inlay and epoxy - strength and failure?

Hello Reader,

What is gained and lost in strength, flex, impact proof, etc. using cotton or other cloth inlay with epoxy resin?

Please share your experience.

Here is mine:

25kg/m3 EPS - 200g(6oz) fiberglass - cotton (thai sarong) - 200g(6oz) glass. The result is super strong, I can punch it and.. it hurts!

For this 5'3" mini simmons 950g of epoxy has been used to glass bottom and rails! 

Now the same model on 5'6" is on the stands without glass between EPS and cotton, using 850g epoxy, it still feels strong but can see some flex when press hard. 

[img_assist|nid=1063399|title=sarong inlay|desc=|link=none|align=left|width=640|height=192][img_assist|nid=1063385|title=Minos Baan Baan 5 3 Bamboo deck - sarong inlay on bottom|desc=|link=none|align=left|width=640|height=235][img_assist|nid=1063384|title=Minos 5'3 mini simmons|desc=|link=none|align=left|width=640|height=640][img_assist|nid=1063386|title=Minos Baan Baan 5 3 Bamboo deck - sarong inlay on bottom|desc=|link=none|align=left|width=640|height=640]

What’s a buckler?

You cotton between two layer of glass is a buckler, it’s a micro sandwich, it increase thickness of laminate so it’s stiffer. Polymer fiber as polyester are ofen use as buckler because they are lighter and have better toughness.

950g of resin is a lot, it’s what i use for all laminate and seal coat for a shortboard !

Sorry for my frenglish

Sorry its’ not “buckler” but “bulker”.  Like this nonwoven polyester:

http://www.lantor.nl/index.php/id_structuur/10598/coremat.html

There is many others materials for same application: aeromat, skinz…

Sorry for my frenglish

I am planning on doing my first fabric inlay in the next few weeks and this made me pause: I have been planning on putting the cotton fabric down first, straight on the foam (EPS and RR build) then glassing over.

Is it much better to get a layer of glass down first and sandwich the fabric? The idea of the cotton being a bulker and adding space between layers therefore making it structurally stronger makes total sense… but is one way or the other ‘better’ or is it entirely down to preference? …in terms of durability etc…

Thanks for any insight… Mousset I dig the tablecloth board, it got me looking at some plaids and things in the fabric store. 

Salut Lemat,

Si 950g ont été absorbés c’est parce que le sarong utlisé est de basse qualité avec des mailles très grossières je crois. J’ai tellement pressé avec le squegee pour essayer de distibuer la résine, et en utiliser moins, que j’ai crée des micros poches d’air (pas joli au ponçage…). On peut utiliser du polyester comme inlay avec de l’epoxy?

Merci beaucoup pour les infos :slight_smile:

david (le suisse en Thailande :slight_smile:

Hi Bckyle,

Yeah when you start thinking with cloth inlay the range of possibilies is almost too vast. I’m not using table cloth but sarong for men and soon for ladies :wink:

[img_assist|nid=1063457|title=men sarongs|desc=|link=none|align=left|width=640|height=529]For a next one (probably a longer board) I think that I may use a layer of 120g (4oz) under the cloth to get thi mini sandwich strength… Will see…will post.

 

 

Les tissus polymères sont plus resistants à la dechirure pour un poids moindre, ils donnent de bien meilleurs résultats comme bukler car pour le même poids qu’un tissus en coton, ils seront beaucoup plus épais et auront une meilleure résilience (il faudrait theoriquement les stratifier avec une résine à fort allongement). Leur limite étant l’accroche avec les résines qui peut être problematique pour les fibres polymères les plus performantes comme le polyetylène HD et le polypropylène, moins de problèmes avec les polyamides (nylon) et encore moins avec les bonne vieilles fibre polyester. Ces fibres existent avec des tissages spécifiques pour les composites sous des noms de marques: diolen, spectra,kevlar,dyneema,innegra etc… Mais elle sont aussi utilisées en intissé dans le bâtiment, l’industrie la décoration et tissées dans la couture. Reste à trouver les imprimés qui te plaisent…

Bonne année.

Mat

Merci Mat,

Bonne année à toi aussi :slight_smile:

Merci pour ces informations précises! On entend le pro. Donc si je comprends bien, nimporte quel polyester farait l’affaire?! Et j’ai une résine que j’utilise normalement pour “coater” (10-12 heures to cure) très flexible, un test sur polyster vaudrait la peine?!

Je m’étais intéressé aux tec d’infusion et il me semble que le nylon était utilisé en surface pour la teture finale, il était litéralement pelé laissant une surface prète à être peinte ou coatée… Pas le genre de truc que tu veux voir arriver à ton inlay!

Sorry for our frog talk guys…

m

OK, you got me curious - thanks Google translate, maybe not the most accurate, but at least we get the gist of it!

Thank you Matt,

Happy New Year to you too:)

Thank you for this information accurate? Refers to the pro. So if I understand what nimporte polyester farait the case?! And I have a resin that I use normally for "coat" (10-12 hours to cure) very flexible polyster a test would be worthwhile?!

I was interested in brewing tec and it seems that nylon was used for the surface Teturi final, he was literally peeled leaving a surface ready for painting or Coated ... Not the kind of thing you want to see happen to your inlay!

Hi Huckelberry,

Sorry for the french touch…

a retouch on the translation for you :slight_smile:

 

Thank you for this informations.  Refers to the pro. So if I understand whatever polyester would be alright?! And I have a resin that I usually use for coating (10-12 hours to cure) very flexible. To test it with polyster would be worthwhile?!

I was interested in the infusion technic once and think I remember that nylon cloth was used for the surface texture, it has to be literally peeled off leaving a surface ready for painting or coating ... Not the kind of thing you want to see happen to your inlay!

Inlays or deck patches of cloth made from organic fibres work a treat! My experience is similar to yours. I’ve got a fish with the following glassing schedule (on the deck): EPS - one layer of 6oz. e-glass(actually glass offcuts) - deck patch of 7 oz. linen (flax cloth) - one layer of 6 oz. e-glass. The deck is rock solid. However, I advise to always use glass as the final layer. This does not only create a micro-sandwich as mentionned by lemat, it also makes sanding easier, as the natural fibres tend to fray when sanded.

In English… (it’s a bit difficult for me)

Yes whatever polyester cloth will be good, but tighter waves are difficult to lam.

Nylon peel ply are coated with a realease agent to not bond to resin.