What are the differences ...

[Betty Hiner]

...between E-glass and S-glass blanks/rods?

[Normand]

http://www.wmi.org/bassfish/bassboar...ssage_id=44257

[Betty Hiner]

How would their differences matter in fly fishing blanks? <No, I haven't a clue about crankbaits and bass>

[kbproctor]

What I saw on Wikipedia indicated it is in the formulation of the glass itself. E-Glass is the most common and is found in most things that are fiberglass. S-Glass is a higher tensile strength formulation.

[Normand]

will this explain it better?

from the web


I think you will find that ;_
- the early brown glass blanks were E-glass in a phenolic thermoplastic resin matrix
- the yellow/greenish Fenwicks were E-glass in a polyester thermoplastic resin matrix
- then came E-glass in an epoxy thermoplastic resin matrix.
- much more recently came blanks made from S-glass in an epoxy thermoplastic resin matrix.

S glass has pretty much the same elastic properties as E-glass but significantly higher tensile strength...........ie they make stiffer thinner wall blanks of the same power as E-glass.

Some typical, property numbers are:-

Tensile Strength (Mpa) ............. E-glass 3450 / S-glass 4300
tensile modulus ( Gpa)............... E-glass 72.4 / S-glass 86.9
Strain to failure........................ E-glass 4.8% / S-glass 5.0%

The thing here with C/F and F/G is that C/F has a lower compression strength than tensile strength ...........so it fails in compression on the underside of the curved rod under load , where the fibres are in compression .
F/G on the other hand has higher elasticity than C/F and higher compression strength than tensile strength...........it typically fails on the topside of the curved rod under load, where the fibres are in tension.
ie
F/G can bend to a tighter radius than C/F before failure...........but its not as stiff nor as strong as C/F.......... and for the same power a F/G blank is significantly heavier than a C/F blank .

Hence the attraction to multi-modulus blank designs with S-glass tips transitioning into C/F mid-section & butt........... nice light action tip with the ability to bend into a tighter radius more than C/F and C/F butts which don't need to bend into a tight radius .................giving a hybrid multi-modulus blank which is still very light weight.

This can be achieved with a lighter weight blank using S-glass than using E-glass for the same tip power.

Very recent advances in C/F fibre manufacture that are producing a thinner higher density fibre and post-formation heat treatment modification are able to achieve compression strengths close to tensile strengths & can produce blanks that are very similar to F/G actions, but much lighter in weight ( lighter even than typical C/F blanks )..........but they are horribly expensive.

Someone else can chime in if my memory got the history of glass types wrong.

[Betty Hiner]

Yes, Normand, that did help appreciably! You just gotta remember who is asking!