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Post Time: 04/06/2009 21:09:50 |
Jayne Papworth
Total Forum Posts: 23 |
Hi
Two further queries if I may please.
1. We are planning to replace our children's bedrooms windows with Pilkington K glass and reinforced frames to prevent RF entry. Please can you advise this is still the most effective glazing for this purpose and if so the precentage reduction we can expect (I have contacted the company diectly who were non commital).
2. If Pilkington K is the most suitable product then given that we also have a condensation problem would you advise the aluminiun spacer bar or the black super spacer bar (which I believe is rubber).
3. We are also planning to paint the external parts of the childrens bedrooms walls with the HSF54 paint and planned to earth it too. However, I have just read some comment regarding it is not recommended to earth foil in bedrooms, would the same therefore apply to the paint?
Thanks for all you help and asdvice once again.
Jayne |
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Post Time: 08/06/2009 11:44:06 |
Sarahp
Total Forum Posts: 48 |
Hi Jayne
Pilkington K works because of the thermal coating - it's not specifically designed for screening, and we are not glazing specialists, so I'm not sure I can point to any other type of window glass.
Another very good alternative is to use window film on existing windows - EMFields are going to be selling three varieties that are very good at screening - we're in the process of sorting out the web pages at the moment.
The same issue applies to earthing paint as well as foil - it's only worth earthing if you are getting high electric fields in the first place. If you have the equipment, do a "before and after" test and see if you should be earthing. Take a measurement BEFORE the paint is applied. record it. Take a measurement AFTER the paint is applied. Compare the two. If the electric field is high, try earthing the paint and then taking the measurements again. Go with the lowest choice - earthed or non earthed :)
The paint will stop stop radiofrequency fields whether earthed or not. |
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Post Time: 08/06/2009 17:06:51 |
Jayne Papworth
Total Forum Posts: 23 |
Hi Sarah
Thanks for your advice, may I just check a couple of things with you though.
1. As regards the Pilkington K, I am sure I have read on the Powerwatch site somewhere that 99% plus microwaves are eliminated by the Pilkington K glass and wondered if this was a result of some tests your selves have undertaken given that the manufacturers themselves will not commit on this matter.ie am I right in thinking it will reduce the levels that significantly?
2. We have been given the option of two types of spacer bar - either aluminium/ metal OR black plastic or rubber I believe and wondered in terms of reducing microwaves if there was one which you think would be better or would it make no difference providing we have the reinforced metal frames?
Sorry for all the questions but it is a big investment for us so we want to make sure we make the right choice in this regard!
Thanks ever so much with your patience and advice/ support!
Jayne |
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Post Time: 23/06/2009 09:51:13 |
Sarahp
Total Forum Posts: 48 |
1) We havent measured the pilkington k glass so we dont know the full screening effects. If you find that 99% reference, please let me know as I am unaware of it. We know its fairly effective, but I dont know whether its that effective!
2) aluminium will block RF fields, plastic/rubber will not. Go with the aluminium.
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Post Time: 23/06/2009 23:20:21 |
Jayne Papworth
Total Forum Posts: 23 |
Hi Sarah
Thanks for that. I found the reference to the 99% effectiveness on the document Radiofrequency Protection and your family, page 43, from your website. If you do have any further clarification/ comments then they would be gratefully received.
Thanks again |
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Post Time: 30/06/2009 23:32:34 |
alasdairP
Total Forum Posts: 173 |
Sorry about the delays. I did some relatively informal measurements of Pilkington-K windows about 3 or 4 years ago and found about a 99% power reduction from GSM900 and GSM1800 signals. This sounds a lot, but it isnt enough if you have strong signals right outside. I was not able to test it for 3G/UMTS.
Pilkington have always been most unhelpful about supplying details of the microwave reduction properties of their glass. They designed the glass coating for thermal reflection properties and the microwave ones were a useful addition, but they have never featured them (as far as I know).
I wonder where the "spacer bars" actually are? are they just round the edge to separate the glass panes, or are they area dividers to make the appearance of smaller panes within the window?
Microwaves leak through the frame, so that is best if it has a good aluminium core within any PVC covering.
If your existing windows are generally OK as windows, EMFields is about to launch a very good, very screening, film to go on existing glass (much better than K-glass at stopping microwaves). The clear one is expensive and is best put on professionally. There is also a fairly dark film which is about as good at keeping out microwaves but is significantly cheaper.
The paint probably does not need earthing. The problem is that if you dont effectively earth the floor (earthed foil under the carpet or similar), then earthing the wall can increase the power-frequency electric fields on the bed. You either need to earth almost every surface (best), or none of them (not usually as good, but better than just earthing the wall). It sounds a bit complicated, but electric fields look for an earthed surface to return to and the bed can end up as the pathway they take between the floor and the wall.
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Post Time: 02/07/2009 21:16:52 |
Jayne Papworth
Total Forum Posts: 23 |
Thanks for this Alasdair
As regards this new film, do you know:
1. when it will be available,
2. how much and how easy it is to then clean the window (presumably it is fitted inside?)
3.effects on condensation issues (which we have).
4. presumably it fits onto glass only, so what to do to stop microwaves coming through the frame?
5. Finally you say about professional fitting being best. Can you recommend anyone who would fit such a product?
Many Thanks
Jayne |
