Secondary Glazing UK Secondary Double Glazing UK by Protech Direct

This is an an architectural aluminium secondary glazing system anchored into a hardwood subframe for maximum sound insulation and should not be confused with upvc or aluminium diy kits, it is fitted in St Paul's Cathedral and Teesside airport to name a tiny few of the architectural projects that this system has been used.

Test for Watertightness

Test in accordance with BS6375. Part 1: Water temperature 17ºc classified for watertightness.

Test pressure class (Pa): 300

Occurrence of Leakage		Position of Leakage
Pressure (Pa)	Time (min)
400	41	Leakage through fixed joint at X
500	47	Upwards spray at Y
600	50	Leakage through beading applied to cill at Z
Limit of Watertightness (Pa)		300Pa

Air Permeability

Test in accordance with BS5368 Part 1: Air temperature 19.5ºc, total window area 2.01m², this window is classified for air permeability as follows:

Test Pressure class (Pa):600

Acoustic Performance

Sound Reduction Index measurements were conducted at the AIRO Acoustics Laboratory in accordance with BS2750: Part 3: 1980 and BS5821: Part 3: 1984, using a purpose built transmission suite. AIRO is accredited as a NAMAS TESTING Laboratory NO.0483.

The weighted sound reduction index, Rw = 45dB (BS5821: Part 3: 1984)

Frequency Hz	R dB	Frequency Hz	R dB
100	23.2	800	49.8
125	26.9	1000	51.9
160	30.1	1250	51.0
200	36.8	1600	50.5
250	37.8	2000	50.0
315	37.1	2500	48.9
400	34.6	3150	43.3
500	43.1	4000	41.0
600	45.7	5000	44.5

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