glasswool in bangalore

[soundnovice]

hi all
i am looking for glasswool availability in bangalore. please let me know if anybody is aware of any shops that sell glasswool (or better damping material) for loose.

 

[GeorgeO]

JC Road should be your source I think.

 

[quad]

hi all
i am looking for glasswool availability in bangalore. please let me know if anybody is aware of any shops that sell glasswool (or better damping material) for loose.

Check with a airconditioning parts shop or a AC mechanic.

 

[GeorgeO]

Of course, Quad is right-I didnt think correctly-A/c guys are your first stop!

 

[soundnovice]

one stop shop for acoustic material
index

 

[gopib]

Good one. Thanks. Do they retail also???

 

[Hari Iyer]

hi all
i am looking for glasswool availability in bangalore. please let me know if anybody is aware of any shops that sell glasswool (or better damping material) for loose.

If you are looking for acoustics damping, will not polyester cotton (Dacron / Recron from Reliance Industries) be more suitable than glass wool? They are easily available at gaddiwalas and are available in varying density. Added advantage is they are not toxic and easy to handle and store. Cost wise also they are available from Rs.100/Kg to Rs.200/Kg depending upon the density of the fiber.

 

[cmsajith]

If you are looking for acoustics damping, will not polyester cotton (Dacron / Recron from Reliance Industries) be more suitable than glass wool? They are easily available at gaddiwalas and are available in varying density. Added advantage is they are not toxic and easy to handle and store. Cost wise also they are available from Rs.100/Kg to Rs.200/Kg depending upon the density of the fiber.

Using them alone will not give any desirable results (same kinda material with ~600GSM density is being used by many reputed acoustic companies), it should be used along with the woodwool board, together will give an absorption coefficient near to .9, else it is somewhere near to .4

 

[npalesha]

hi all
i am looking for glasswool availability in bangalore. please let me know if anybody is aware of any shops that sell glasswool (or better damping material) for loose.

why not use egg foam. easy to apply. available in mumbai. will check if the same is available in bangalore. size available 1 meter x 2 metre. also used by genset manufacturers as sound damping material.

 

[gobble]

Using them alone will not give any desirable results (same kinda material with ~600GSM density is being used by many reputed acoustic companies), it should be used along with the woodwool board, together will give an absorption ratio near to .9, else it is somewhere near to .4

What is woodwool board? Does is come from shearing wooden sheep? Baaaa...! :lol:

Where can I get it in Blore?

-G

 

[Hari Iyer]

Using them alone will not give any desirable results (same kinda material with ~600GSM density is being used by many reputed acoustic companies), it should be used along with the woodwool board, together will give an absorption ratio near to .9, else it is somewhere near to .4

What is absorption ratio? I have heard that the speed of sound varies based on different damping used (glasswool, polyester fiber, wool etc.) and is also directly proportional to the density of the material. I have also heard a term called damping coefficient which usually is expressed in pouds/cubic feet and is usually in fractions from 0 to 3 depending upon the above factors and the other parameters of the enclosures. Is the absorption ratio and the damping coefficient one and the same?

 

[santhosh]

For Fiberglass in Bangalore, contact the Twiga dealership at:

http://www.google.co.in/search?q=twiga+Bangalore&ie=UTF-8&oe=UTF-8&hl=en&client=safari

@Gobble: Woodwool board are manufactured by:

1) Anutone
2) Vinardax

Both are Bangalore based companies. Quality of Anutone is superb while Vinardax can be had for much lesser price for ~70% of Anutone's quality IMO.






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[santhosh]

Few things as I understand it. Please correct me if I am wrong.

IMO the material to be used depends on the application. All these materials discussed ^ are good sound absorption products and are differentiated by their absorbent coefficients as below:

0.00 = no absorption
0.50 = 50% absorption
1.00 = 100% absorption

Now, depending on the application one has to choose the material as the co-efficient of a material differs across frequency ranges. Also lesser the density of the same material increases the absorption coefficient of Highs & Mids and reduces the absorption coefficient of Low Frequencies. The opposite is also true.

Difference between Absorption and damping the way I understand is:

Absorption, we all know. Damping is used to make a surface inert (reduce resonance). For Eg: Speaker Cabinet can be coated with tar sheet or damping products like dynamat to damp it.

So absorption helps the damping cause but damping does not necessarily need to be done using absorptive material.





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[cmsajith]

What is absorption ratio? I have heard that the speed of sound varies based on different damping used (glasswool, polyester fiber, wool etc.) and is also directly proportional to the density of the material. I have also heard a term called damping coefficient which usually is expressed in pouds/cubic feet and is usually in fractions from 0 to 3 depending upon the above factors and the other parameters of the enclosures. Is the absorption ratio and the damping coefficient one and the same?

Its Absorption coefficient, not Absorption ratio.

Damping coefficient and Absorption coefficients are different.The Damping is effective with mass and hence measured in pounds/cubic feet as you had mentioned. Absorption is effective with the density of the material and the ability of the material to convert from one form of energy to another. In case of fibreglass it converts the sound energy to heat and hence reducing the amount of the sound energy goes out of it, effectively absorbing the sound.

 

[soundnovice]

Good one. Thanks. Do they retail also???

have not checked them yet. i found them with bit of googling!
on their website they have advertised that they sell 'loose' wool. so i guess they
retail...

 

[soundnovice]

If you are looking for acoustics damping, will not polyester cotton (Dacron / Recron from Reliance Industries) be more suitable than glass wool? They are easily available at gaddiwalas and are available in varying density. Added advantage is they are not toxic and easy to handle and store. Cost wise also they are available from Rs.100/Kg to Rs.200/Kg depending upon the density of the fiber.

i tried dacron (bought from local gaddiwalas only). got them for Rs.150/kg. but i am still experiencing booming sound (no matter how much densely i stuff them).

 

[Hari Iyer]

i tried dacron (bought from local gaddiwalas only). got them for Rs.150/kg. but i am still experiencing booming sound (no matter how much densely i stuff them).

If you overdamp your enclosure it will too be booming. The booming bass is a common phenomena in vented and sealed enclosures. If you are using a vented enclosure you should not obstruct the waves between the speaker and the vent and the air mass inside is required for their proper operatiion. The damping will only be for the panels and not to damp the air inside the cabinet. Also the computation of the volume of the enclosure, the vend dia and length depends upon the TS parameters of your mid-woofer / woofer. If the enclsoure is not properly tuned to the resonant frequency of the woofer then it can cause booming due to the Q of the enclosure.

 

[soundnovice]

If you overdamp your enclosure it will too be booming. The booming bass is a common phenomena in vented and sealed enclosures. If you are using a vented enclosure you should not obstruct the waves between the speaker and the vent and the air mass inside is required for their proper operatiion. The damping will only be for the panels and not to damp the air inside the cabinet. Also the computation of the volume of the enclosure, the vend dia and length depends upon the TS parameters of your mid-woofer / woofer. If the enclsoure is not properly tuned to the resonant frequency of the woofer then it can cause booming due to the Q of the enclosure.

the box for the woofer is sealed one. how do i find out if i am overdamping or underdamping?

 

[Hari Iyer]

the box for the woofer is sealed one. how do i find out if i am overdamping or underdamping?

Ideally enclosures are damped around 1 pounds/ cubic feet with polyfill (dacron/ recron). Calculate the cubic feet volume of your enclosure and damp it accordingly around 1 to 1.5 pounds / cubic feet. It should be more or less that weight. Also give importance to the damping material and its density. The more dense the material then it will choke the cabinets internal volume. The damping density should give the cabinet an illusion of more volume rather than consume the internal volume.

 

[soundnovice]

have not checked them yet. i found them with bit of googling!
on their website they have advertised that they sell 'loose' wool. so i guess they
retail...

i think they are not retail dealers.