can polyethylene terephthalate be degradable if used to make a woven cord?
Q. can polyethylene terephthalate be degradable if used to make a woven cord?
Asked by Andy W - Tue Sep 11 11:09:53 2007 - - 1 Answers - 0 Comments
A. I'm not quite sure what you are asking. A common form of PET is Terylene, used for clothing etc, but it is also used for plastic mouldings and extrusions from which cord is sometimes made. It is not normally considered to be biodegradable if that's what you mean but if you leave it long enough, particularly if it is exposed to sunlight, rain etc then it will, eventually, degrade.
Answered by tomsp10 - Tue Sep 11 13:09:19 2007
Q. can polyethylene terephthalate be degradable if used to make a woven cord?
Asked by Andy W - Tue Sep 11 11:09:53 2007 - - 1 Answers - 0 Comments
A. I'm not quite sure what you are asking. A common form of PET is Terylene, used for clothing etc, but it is also used for plastic mouldings and extrusions from which cord is sometimes made. It is not normally considered to be biodegradable if that's what you mean but if you leave it long enough, particularly if it is exposed to sunlight, rain etc then it will, eventually, degrade.
Answered by tomsp10 - Tue Sep 11 13:09:19 2007
What is a similar Plastic to Polyethylene terephthalate (PET/PETE)?
Q. What is a similar Plastic to Polyethylene terephthalate (PET/PETE)?
Asked by Dom H - Sun Oct 4 09:49:24 2009 - - 1 Answers - 0 Comments
Q. What is a similar Plastic to Polyethylene terephthalate (PET/PETE)?
Asked by Dom H - Sun Oct 4 09:49:24 2009 - - 1 Answers - 0 Comments
How to calculate reactant in gram if a ratio is given? PET(Polyethylene Terephthalate):Glyceol 1:4, 1:5, 1:6?
Q. PET is192 g/mol Glycerol is 92.09382g/mol
Asked by lcsum - - Thu Aug 28 05:34:06 2008 - - 1 Answers - 0 Comments
Q. PET is192 g/mol Glycerol is 92.09382g/mol
Asked by lcsum - - Thu Aug 28 05:34:06 2008 - - 1 Answers - 0 Comments
U value of polyethylene terephthalate (PET)?
Q. Anyone know the U value of polyethylene terephthalate (PET)? I am reasonably sure it has a better insulating value than glass but I would just like to confirm this.
Asked by marcus_lee1 - Thu Jan 1 16:19:02 2009 - - 1 Answers - 0 Comments
A. U is not strictly a material property. Conductivity is a better measure. Conductivity of PET is about 0.24, while glass is about 1.1. Thus, PET passes 4.6 times less heat (i.e. much better insultator).
Answered by wingstwo - Thu Jan 1 16:34:23 2009
Q. Anyone know the U value of polyethylene terephthalate (PET)? I am reasonably sure it has a better insulating value than glass but I would just like to confirm this.
Asked by marcus_lee1 - Thu Jan 1 16:19:02 2009 - - 1 Answers - 0 Comments
A. U is not strictly a material property. Conductivity is a better measure. Conductivity of PET is about 0.24, while glass is about 1.1. Thus, PET passes 4.6 times less heat (i.e. much better insultator).
Answered by wingstwo - Thu Jan 1 16:34:23 2009
how can I find the chemical make up of Bisphenol A (BPA) and polyethylene terephthalate (PET)?
Q. I know that Bisphenol A (BPA) is found in hard plastic bottles and polyethylene terephthalate (PET or PETE) is found in single use plastic bottles (ie water bottles). I am wondering if there is a chemical way to break these down, so I can better compare or explain them. What chemicals or compounds are within BPA and PET? I am writting an essay about plastic bottles for a chemistry class and I have to deal with the chemical aspect of what I write about. Any ideas or sites would be greately appreciated! I will give 10 pts!! Thanks!
Asked by Smile:) - Wed Apr 30 12:11:59 2008 - - 1 Answers - 0 Comments
A. This looks like something in Wikipedia or the CRC Rubber Handbook.
Answered by FromChelseaAndProud - Wed Apr 30 12:15:40 2008
Q. I know that Bisphenol A (BPA) is found in hard plastic bottles and polyethylene terephthalate (PET or PETE) is found in single use plastic bottles (ie water bottles). I am wondering if there is a chemical way to break these down, so I can better compare or explain them. What chemicals or compounds are within BPA and PET? I am writting an essay about plastic bottles for a chemistry class and I have to deal with the chemical aspect of what I write about. Any ideas or sites would be greately appreciated! I will give 10 pts!! Thanks!
Asked by Smile:) - Wed Apr 30 12:11:59 2008 - - 1 Answers - 0 Comments
A. This looks like something in Wikipedia or the CRC Rubber Handbook.
Answered by FromChelseaAndProud - Wed Apr 30 12:15:40 2008
What is PET (Polyethylene terephthalate)?
Q. Is PET bottles are safe to reuse? In PET bottles there is number - 1 to 10. Have heard that some grade PET bottles can not be reused. But it is found that a good number of people - young & old around the globe reuse PET bottles for multiple times for drinking water. If it is injurious to health then why and what type of injury can happen? Reuse, i wanted to mean using without recycling. When you recycle it will change to something else. I wanted to say that if you buy a coca cola in PET bottle and finish it. After that you started to use it a your water bottle and keep using. Is it harmful to health. I have heard that reusing like this the botle generate some chemicals which is injurious to health.
Asked by dibesic - Thu Aug 9 08:34:11 2007 - - 1 Answers - 0 Comments
A. PET bottles all have the number 1 inside the recycling symbol. The numbers represent the materials out of which the recipients are made, as told here : PET bottles are reused in order to make PET flakes, which will become components of new recipients. However, not too much PET flakes can be used to make new bottles, so they do not significantly alter or diminish the quality of the new bottle. I have never heard that reusing a PET bottle can be hazardous to health, especially if reusing it to drink water. So I say that they are safe to reuse. But it is best to get rid of them, putting them into the special containers, thus helping recycling.
Answered by Alucarda - Thu Aug 9 09:27:00 2007
Q. Is PET bottles are safe to reuse? In PET bottles there is number - 1 to 10. Have heard that some grade PET bottles can not be reused. But it is found that a good number of people - young & old around the globe reuse PET bottles for multiple times for drinking water. If it is injurious to health then why and what type of injury can happen? Reuse, i wanted to mean using without recycling. When you recycle it will change to something else. I wanted to say that if you buy a coca cola in PET bottle and finish it. After that you started to use it a your water bottle and keep using. Is it harmful to health. I have heard that reusing like this the botle generate some chemicals which is injurious to health.
Asked by dibesic - Thu Aug 9 08:34:11 2007 - - 1 Answers - 0 Comments
A. PET bottles all have the number 1 inside the recycling symbol. The numbers represent the materials out of which the recipients are made, as told here : PET bottles are reused in order to make PET flakes, which will become components of new recipients. However, not too much PET flakes can be used to make new bottles, so they do not significantly alter or diminish the quality of the new bottle. I have never heard that reusing a PET bottle can be hazardous to health, especially if reusing it to drink water. So I say that they are safe to reuse. But it is best to get rid of them, putting them into the special containers, thus helping recycling.
Answered by Alucarda - Thu Aug 9 09:27:00 2007
what is polyethylene terephthalate?
Q. what is polyethylene terephthalate?
Asked by Salah A - Fri Nov 24 08:48:59 2006 - - 6 Answers - 0 Comments
A. Polyethylene terephthalate ( PET, PETE or the obsolete PETP or PET-P) is a thermoplastic polymer resin of the polyester family that is used in synthetic fibers; beverage, food and other liquid containers; thermoforming applications; and engineering resins often in combination with glass fiber. It is one of the most important raw materials used in man-made fibers. Depending on its processing and thermal history, it may exist both as an amorphous (transparent) and as a semi-crystalline (opaque and white) material. Density 1370 kg/m3 Young's modulus(E) 2800 3100 MPa Tensile strength( t) 55 75 MPa Elongation @ break 50 150% notch test 3.6 kJ/m2 Glass temperature 75 C melting point 260 C Vicat B 170 C Thermal conductivity 0.24 W/m.K [cont.]
Answered by jdsheth2004 - Fri Nov 24 09:00:58 2006
Q. what is polyethylene terephthalate?
Asked by Salah A - Fri Nov 24 08:48:59 2006 - - 6 Answers - 0 Comments
A. Polyethylene terephthalate ( PET, PETE or the obsolete PETP or PET-P) is a thermoplastic polymer resin of the polyester family that is used in synthetic fibers; beverage, food and other liquid containers; thermoforming applications; and engineering resins often in combination with glass fiber. It is one of the most important raw materials used in man-made fibers. Depending on its processing and thermal history, it may exist both as an amorphous (transparent) and as a semi-crystalline (opaque and white) material. Density 1370 kg/m3 Young's modulus(E) 2800 3100 MPa Tensile strength( t) 55 75 MPa Elongation @ break 50 150% notch test 3.6 kJ/m2 Glass temperature 75 C melting point 260 C Vicat B 170 C Thermal conductivity 0.24 W/m.K [cont.]
Answered by jdsheth2004 - Fri Nov 24 09:00:58 2006
Separation of Polyethylene terephthalate (PET) & Polyvinyl chloride (PVC)?
Q. If both (in granule form) were poured into a water tank and a motor inside the tank rotates at a certain constant speed will either separate with one floating to the top and the other saturating to the lower part of the tank?
Asked by got2b_chris - Thu Feb 8 11:27:54 2007 - - 2 Answers - 0 Comments
A. Published densities are 1.335 and 1.392 g/cc for PET and PVC, respectively. This difference is too small to separate by mixing in water, they both will sink. If you are trying to separate a lot of accidentally mixed granules of these polymers, the only thing I can suggest is to throw the whole lot into MEK (methyl ethyl ketone). The PVC will dissolve, the PET will not.
Answered by Glenguin - Thu Feb 8 12:16:12 2007
Q. If both (in granule form) were poured into a water tank and a motor inside the tank rotates at a certain constant speed will either separate with one floating to the top and the other saturating to the lower part of the tank?
Asked by got2b_chris - Thu Feb 8 11:27:54 2007 - - 2 Answers - 0 Comments
A. Published densities are 1.335 and 1.392 g/cc for PET and PVC, respectively. This difference is too small to separate by mixing in water, they both will sink. If you are trying to separate a lot of accidentally mixed granules of these polymers, the only thing I can suggest is to throw the whole lot into MEK (methyl ethyl ketone). The PVC will dissolve, the PET will not.
Answered by Glenguin - Thu Feb 8 12:16:12 2007
More on plastics.. Polypropylene (PP) vs Polyethylene Terephthalate (PET)?
Q. 1. What is the difference between PP and PET? 2. Which one is required to form a part of a greater composition? 3. Is PP a 'part' of PET or is it vica versa? 4. Are PP and PET different substances?
Asked by asianetix - Thu Apr 12 11:03:56 2007 - - 1 Answers - 0 Comments
A. 1) PP is a polyhydrocarbon and PET is polyester 2) Which one weights the most? PET weights the most. PET is: -(OC(=O)Ph-C(=O)OCH2CH2)n - PP is: -(CH2CH(CH3))n- 3) no 4) yes
Answered by Dr Dave P - Thu Apr 12 11:12:49 2007
Q. 1. What is the difference between PP and PET? 2. Which one is required to form a part of a greater composition? 3. Is PP a 'part' of PET or is it vica versa? 4. Are PP and PET different substances?
Asked by asianetix - Thu Apr 12 11:03:56 2007 - - 1 Answers - 0 Comments
A. 1) PP is a polyhydrocarbon and PET is polyester 2) Which one weights the most? PET weights the most. PET is: -(OC(=O)Ph-C(=O)OCH2CH2)n - PP is: -(CH2CH(CH3))n- 3) no 4) yes
Answered by Dr Dave P - Thu Apr 12 11:12:49 2007
Is this really dangerous to your health?
Q. I've been hearing stuff about plastics in the news lately and that certain water bottles can be carcinogenous. Specifically PETE 1 - Polyethylene Terephthalate which makes most of our water bottles etc. How dangerous would you think this really is?
Asked by Ethan - Sun Aug 27 16:52:06 2006 - - 6 Answers - 0 Comments
A. I am so SORRY but i cannot think about one more thing that MIGHT give me cancer. I'm going to die of something anyway. Sorry!!
Answered by Samm - Sun Aug 27 16:56:36 2006
Q. I've been hearing stuff about plastics in the news lately and that certain water bottles can be carcinogenous. Specifically PETE 1 - Polyethylene Terephthalate which makes most of our water bottles etc. How dangerous would you think this really is?
Asked by Ethan - Sun Aug 27 16:52:06 2006 - - 6 Answers - 0 Comments
A. I am so SORRY but i cannot think about one more thing that MIGHT give me cancer. I'm going to die of something anyway. Sorry!!
Answered by Samm - Sun Aug 27 16:56:36 2006
how is PET made, like what chemicals and stuff is used to make it?
Q. PET is polyethylene terephthalate, i just need how the actual plastic is made, not how it's molded into bottles, and plates. Like, what are the chemicals and proceses used? and how is it destroyed? not recycled, like, the actual plastic material destroyed?
Asked by <3 animal luvaah <3 - Thu Mar 19 18:32:43 2009 - - 1 Answers - 0 Comments
A. PET is a polyester, made up of purified terephthalic acid (PTA) and monoethylene glycol (MEG). Sometimes the dimethyl ester of PTA, dimethyl terephthalate is used. There is also another form of PET called PETG which is modified by the addition of cyclohexanedimethanol. This makes the polymer amorphous but less rigid and easier to process. PET is a semi-crystalline polymer. In synthesis, antimony trioxide (or triacetate) is used as catalyst. The process is a polycondensation reaction in which the acid groups in PTA react with the hydroxyl group in the glycol (diol) to form the ester linkages and water as a byproduct. It doesn't get destroyed, but degrades very slowly. That's why recycling is the best thing to do.
Answered by koyzun - Mon Mar 23 11:57:35 2009
Q. PET is polyethylene terephthalate, i just need how the actual plastic is made, not how it's molded into bottles, and plates. Like, what are the chemicals and proceses used? and how is it destroyed? not recycled, like, the actual plastic material destroyed?
Asked by <3 animal luvaah <3 - Thu Mar 19 18:32:43 2009 - - 1 Answers - 0 Comments
A. PET is a polyester, made up of purified terephthalic acid (PTA) and monoethylene glycol (MEG). Sometimes the dimethyl ester of PTA, dimethyl terephthalate is used. There is also another form of PET called PETG which is modified by the addition of cyclohexanedimethanol. This makes the polymer amorphous but less rigid and easier to process. PET is a semi-crystalline polymer. In synthesis, antimony trioxide (or triacetate) is used as catalyst. The process is a polycondensation reaction in which the acid groups in PTA react with the hydroxyl group in the glycol (diol) to form the ester linkages and water as a byproduct. It doesn't get destroyed, but degrades very slowly. That's why recycling is the best thing to do.
Answered by koyzun - Mon Mar 23 11:57:35 2009
How do the properties of plastic differ and for which processes or applications are they best suited?
Q. Materials: Polyethylene Terephthalate (PET) High-Density Polyethylene (HDPE) Polystyrene Foam (PS)
Asked by Shelby - Fri Mar 12 16:10:59 2010 - - 1 Answers - 0 Comments
A. Polyethylene Terephthalate (PET) - Is a very clean and strong plastic . It is used almost exclusively for plastic beverage bottles because it doesn't impart a plastic taste to the product, plus the plastic is dense enough and strong enought o resist high pressure carbonation without it leaking thru plastic molecules. It is also easy to recycle and is made into carpet fiber (polyester) and clothes because of the high quality of the plastic High-Density Polyethylene (HDPE) - has higher strength than regular plastic, so is good for milk jugs, garbage bags , Plastic chairs and plastic water pipes etc. Polystyrene Foam (PS) - This is the common stryofoam everyone knows. Here a polystyrene plastic , which is cheap and fairly rigid, is treated… [cont.]
Answered by biire2u - Fri Mar 12 16:32:15 2010
Q. Materials: Polyethylene Terephthalate (PET) High-Density Polyethylene (HDPE) Polystyrene Foam (PS)
Asked by Shelby - Fri Mar 12 16:10:59 2010 - - 1 Answers - 0 Comments
A. Polyethylene Terephthalate (PET) - Is a very clean and strong plastic . It is used almost exclusively for plastic beverage bottles because it doesn't impart a plastic taste to the product, plus the plastic is dense enough and strong enought o resist high pressure carbonation without it leaking thru plastic molecules. It is also easy to recycle and is made into carpet fiber (polyester) and clothes because of the high quality of the plastic High-Density Polyethylene (HDPE) - has higher strength than regular plastic, so is good for milk jugs, garbage bags , Plastic chairs and plastic water pipes etc. Polystyrene Foam (PS) - This is the common stryofoam everyone knows. Here a polystyrene plastic , which is cheap and fairly rigid, is treated… [cont.]
Answered by biire2u - Fri Mar 12 16:32:15 2010
What kind of plastic are the RAM packagings made of?
Q. I would like to know, exactly what plastic is/are used at this kind of box: I think the upper part is PET (polyethylene terephthalate) the lower part is PP (polypropylene). Am I right?
Asked by gerriki - Sun Mar 16 12:23:51 2008 - - 1 Answers - 1 Comments
A. SOFT plastic (i)
Answered by ela kolla - Wed Mar 19 14:53:30 2008
Q. I would like to know, exactly what plastic is/are used at this kind of box: I think the upper part is PET (polyethylene terephthalate) the lower part is PP (polypropylene). Am I right?
Asked by gerriki - Sun Mar 16 12:23:51 2008 - - 1 Answers - 1 Comments
A. SOFT plastic (i)
Answered by ela kolla - Wed Mar 19 14:53:30 2008
What year did PET plastic bottles come into existence?
Q. also known as Polyethylene terephthalate
Asked by Hadilf Otler - Tue Jan 12 11:08:54 2010 - - 2 Answers - 0 Comments
A. The patent for the PET bottle was issued in 1973 to Nathaniel Wyeth, who is the brother of the famous American painter Andrew Wyeth.
Answered by curtisports2 - Tue Jan 12 18:45:57 2010
Q. also known as Polyethylene terephthalate
Asked by Hadilf Otler - Tue Jan 12 11:08:54 2010 - - 2 Answers - 0 Comments
A. The patent for the PET bottle was issued in 1973 to Nathaniel Wyeth, who is the brother of the famous American painter Andrew Wyeth.
Answered by curtisports2 - Tue Jan 12 18:45:57 2010
Do water bottles release harmful chemcials after extended use or heat?
Q. My girlfriend mailed this article to me. I dont have the source its from, but is it true or not? any health or chemical specialists out there? Do Not re-use mineral water bottles! Many are unaware of poisoning caused by re-using plastic bottles.Some of you may be in the habit of using and re-using your disposable mineral water bottles, keeping them in your car or at work. not a good idea. It happened in dubai, when a 12 year old girl died after a long usage...16 months of SAFA mineral water bottle, as she used to carry the same fancy bottle to her school daily. In a nutshell, the plastic called polyethylene terephthalate or PET used in these bottles contains a potentially carcinogenic element something call DEHA. The bottle are safe for… [cont.]
Asked by Chyi C - Wed Apr 11 02:23:47 2007 - - 2 Answers - 0 Comments
A. there was a notice out that plastic that was heated in a microwave could cause cancer. there is evidence that the emissions from heating plastic can cause health problems. But as far as drinking from a water bottle. the only health problem you may get is bacteria that has built up from your own mouth. When left in the sun we all know the sun increases the growth of bacteria.
Answered by Shelly t - Wed Apr 11 17:46:28 2007
Q. My girlfriend mailed this article to me. I dont have the source its from, but is it true or not? any health or chemical specialists out there? Do Not re-use mineral water bottles! Many are unaware of poisoning caused by re-using plastic bottles.Some of you may be in the habit of using and re-using your disposable mineral water bottles, keeping them in your car or at work. not a good idea. It happened in dubai, when a 12 year old girl died after a long usage...16 months of SAFA mineral water bottle, as she used to carry the same fancy bottle to her school daily. In a nutshell, the plastic called polyethylene terephthalate or PET used in these bottles contains a potentially carcinogenic element something call DEHA. The bottle are safe for… [cont.]
Asked by Chyi C - Wed Apr 11 02:23:47 2007 - - 2 Answers - 0 Comments
A. there was a notice out that plastic that was heated in a microwave could cause cancer. there is evidence that the emissions from heating plastic can cause health problems. But as far as drinking from a water bottle. the only health problem you may get is bacteria that has built up from your own mouth. When left in the sun we all know the sun increases the growth of bacteria.
Answered by Shelly t - Wed Apr 11 17:46:28 2007
Need Help on this! About My Project. Its all about Polymers.?
Q. can anyone please give me commercial example(s) of each of the polymers stated below? 1.) polytetrafluoroethylene 2.) polyurethane 3.) polyamide 4.) polyacrylamide what i mean about commercial examples are those items that we people use in our daily living. (e.g. water bottles = polyethylene terephthalate) your help will be greatly appreciated.
Asked by 2wickze4 - Tue Jul 27 16:22:23 2010 - - 1 Answers - 0 Comments
Q. can anyone please give me commercial example(s) of each of the polymers stated below? 1.) polytetrafluoroethylene 2.) polyurethane 3.) polyamide 4.) polyacrylamide what i mean about commercial examples are those items that we people use in our daily living. (e.g. water bottles = polyethylene terephthalate) your help will be greatly appreciated.
Asked by 2wickze4 - Tue Jul 27 16:22:23 2010 - - 1 Answers - 0 Comments
monomers plz need help =]?
Q. whats the monomer of polyethylene terephthalate? thx
Asked by Amir - Wed May 26 03:23:40 2010 - - 2 Answers - 0 Comments
A. Remove the "poly", and you got it.
Answered by Jeff - Wed May 26 03:25:29 2010
Q. whats the monomer of polyethylene terephthalate? thx
Asked by Amir - Wed May 26 03:23:40 2010 - - 2 Answers - 0 Comments
A. Remove the "poly", and you got it.
Answered by Jeff - Wed May 26 03:25:29 2010
IR spectrum of PETE polymer..will give you a BEST ANSWER?
Q. Identify the two different carbonyl groups, and explain why they the stretches are different Here is the structure of the PET polymer: And here is the IR spectrum: (it's the first one A. Polyethylene terephthalate (PETE, recycling #1) ..thanks
Asked by lizzie - Wed Nov 26 16:28:55 2008 - - 1 Answers - 0 Comments
A. I am a clowfish and we know nothing of these things. I just wanted to wish you a happy new year in case I die before them.
Answered by Hoplet - Sun Nov 30 12:14:00 2008
Q. Identify the two different carbonyl groups, and explain why they the stretches are different Here is the structure of the PET polymer: And here is the IR spectrum: (it's the first one A. Polyethylene terephthalate (PETE, recycling #1) ..thanks
Asked by lizzie - Wed Nov 26 16:28:55 2008 - - 1 Answers - 0 Comments
A. I am a clowfish and we know nothing of these things. I just wanted to wish you a happy new year in case I die before them.
Answered by Hoplet - Sun Nov 30 12:14:00 2008
Which of these options would be best?
Q. I'm doing a chemistry project on polymer materials which could be used to make wind turbines for renewable energy. I have to pick one and explain why it would be best. My shortlist is 1) Kevlar 2) Polyethylene Terephthalate 3) PVC Which of these would you consider to have the best properties for a wind turbine? If you know of a better polymer which could be used feel free to make a suggestion! Thanks x I have researched it. The purpose of the project is to become familiar with polymer properties not actually come up with a wind turbine plan to save the world! As this is *imaginary* money is no object!
Asked by eljay - Sun Dec 14 06:25:41 2008 - - 2 Answers - 0 Comments
A. "Rotor Blade Materials Most modern rotor blades on large wind turbines are made of glass fibre reinforced plastics, (GRP), i.e. glass fibre reinforced polyester or epoxy.Using carbon fibre or aramid (Kevlar) as reinforcing material is another possibility, but usually such blades are uneconomic for large turbines.Wood, wood-epoxy, or wood-fibre-epoxy composites have not penetrated the market for rotor blades, although there is still development going on in this area. Steel and aluminium alloys have problems of weight and metal fatigue respectively. They are currently only used for very small wind turbines." so i would say kevlar.
Answered by Ja Ma - Sun Dec 14 06:38:22 2008
Q. I'm doing a chemistry project on polymer materials which could be used to make wind turbines for renewable energy. I have to pick one and explain why it would be best. My shortlist is 1) Kevlar 2) Polyethylene Terephthalate 3) PVC Which of these would you consider to have the best properties for a wind turbine? If you know of a better polymer which could be used feel free to make a suggestion! Thanks x I have researched it. The purpose of the project is to become familiar with polymer properties not actually come up with a wind turbine plan to save the world! As this is *imaginary* money is no object!
Asked by eljay - Sun Dec 14 06:25:41 2008 - - 2 Answers - 0 Comments
A. "Rotor Blade Materials Most modern rotor blades on large wind turbines are made of glass fibre reinforced plastics, (GRP), i.e. glass fibre reinforced polyester or epoxy.Using carbon fibre or aramid (Kevlar) as reinforcing material is another possibility, but usually such blades are uneconomic for large turbines.Wood, wood-epoxy, or wood-fibre-epoxy composites have not penetrated the market for rotor blades, although there is still development going on in this area. Steel and aluminium alloys have problems of weight and metal fatigue respectively. They are currently only used for very small wind turbines." so i would say kevlar.
Answered by Ja Ma - Sun Dec 14 06:38:22 2008
Is it safe to drink from PET bottles ?
Q. It has come to my attention that a number of recyclable plastic products are dangerous because certain endocrine disruptor, metabolic disruptor or carcinogenic substances leach out from them. This happens generally with plastic bottles with an SPI recycling code of 7 (marked within the little triangle on bottles). The 7 means it uses "other" resins as material, where "other" can mean some really bad things like BPA. But how safe are soft drink bottles to drink from repeatedly, over time ? These bottles are marked SPI code of 1, which means they are made from PET, or Polyethylene Terephthalate. I've read reports that it is safe, but these reports come from parties directly or indirectly interested in its widespread use. What do you… [cont.]
Asked by RBC - Fri Mar 26 18:35:36 2010 - - 1 Answers - 0 Comments
Q. It has come to my attention that a number of recyclable plastic products are dangerous because certain endocrine disruptor, metabolic disruptor or carcinogenic substances leach out from them. This happens generally with plastic bottles with an SPI recycling code of 7 (marked within the little triangle on bottles). The 7 means it uses "other" resins as material, where "other" can mean some really bad things like BPA. But how safe are soft drink bottles to drink from repeatedly, over time ? These bottles are marked SPI code of 1, which means they are made from PET, or Polyethylene Terephthalate. I've read reports that it is safe, but these reports come from parties directly or indirectly interested in its widespread use. What do you… [cont.]
Asked by RBC - Fri Mar 26 18:35:36 2010 - - 1 Answers - 0 Comments
From Yahoo Answer Search: 'Polyethylene terephthalate'
Fri Jul 30 00:25:09 2010 [ refresh local cache ]
[Hide]▼
news.google.com
Carlisle Sentinel
1, or polyethylene terephthalate , and polycarbonate No. 7 plastic. Polycarbonate bottles leach a substance known as Bisphenol-A, a chemical that has been ...
cmtevents.com
591px x 591px | 53.50kB
[source page]
Mr Vijay Walia Mr Vijay Walia graduated from Delhi University and in addition has passed a specialised course in pharmacy He has vast experience in selling and marketing in FMCG and pharmaceutical
china-clamshell.com
admin
Fri, 26 Mar 2010 03:13:35 GM
Lee said posts have been widely reproduced major websites, the quote also said that the general mineral water bottles with the PET (. polyethylene terephthalate. ) plastic, the bottle is safe to use once, if repeated the use of there ...
[Hide]▲
