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Join Date: Sep 2006
Posts: 2

plastic material

09/15/2006 12:39 AM

I need to select a thermoformable plastic available in sheet form.

It's to be used for lamp cover(housing) & withstand temp of ~130'C emitting from lamps.

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Guru
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#1

Re: plastic material

09/15/2006 11:10 PM

You say the operating temp is 130C. One would hope that this 130C is far from the forming temperature of this thermoplastic material, or it will creep and sag over time at 130C. And it must be transparent or translucent.

I suggest you survey the properties, via online search, of the common thermoplastics, such as polystyrene, ABS and acrylic.

Possibly a clear thermoset plastc would serve, if one can be found that fits your price?.

Then you need to look at the UL specs for lamps and see if they allow a lamp shade to operate at 130C, which will burn anyone who touches it.

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#2
In reply to #1

Re: plastic material

09/18/2006 5:32 AM

Actualy the lamp housing will have sufficient vents which will keep the cover heated up to or less than 60'c.But the insde environment of the housing is abt 80'c & lamp temp is abt 100'c.with a factor of safty of 20-30% its 130'c inside temp.

but this unit is completly coverd with this plastic on three sides & a transparent PC slide in other side so no scope for lamp exposure to touch. But the surface temp of these plastics will be maitained laess than 60'c.

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Guru
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#3
In reply to #2

Re: plastic material

09/18/2006 8:41 AM

A lamp which depends on vents to stay safe will be tested with the vents blocked to see if it will stay safe in the worst case. This is because in a residential setting a curtain or blanket may block these vents and a fire may start. They do the same with heaters etc, just in case.

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Associate

Join Date: Aug 2007
Location: Belgium, Europe
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#4

Re: plastic material

09/19/2007 9:05 AM

PETG has an ops temp of 66C

PC.............................130C

PMMA, PS, SAN, PVC: no option

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