Architectural PVB Film
PVB film (Polyvinyl butyral) is a resin mostly used for applications that require strong binding, optical clarity, adhesion to many surfaces, toughness and flexibility. It is prepared from polyvinyl alcohol by reaction with butyraldehyde. The major application is laminated safety glass for building and automobile windshields.
Specification and parameters for PVB applied in architecture .
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Thickness |
Length |
Width |
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0.38mm |
350m |
600-2500mm |
|
0.76mm |
200m |
600~2500mm |
|
1.52mm |
100m |
600~2500mm |
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Items |
0.38mm |
0.76mm |
1.52mm |
|
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appearance and quality |
appearance |
The surface is flat without scratch; wrinkles or adhesion is not allowed. |
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Crystal point, water wave |
The crystal points, dimension is less than 2mm, are not allowed to exist intensively; no water marks are visible. |
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Visible defects (points such as impurities, bubbles, blemishes, oil droplets, teardrops, etc.) |
Dimension is more than 0.5mm, less than 10 each 350 m |
Dimension is more than 0.5mm, less than 6 each 200m
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Dimension is more than 0.55mm, less than 4 each 100m |
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The point of the diameter is 0. 5mm Defects are densely populated (Note 1), and each densely populated area is considered to be a defect with a diameter > 0.5 mm. The type and location of the defect should be stated in the packing list. |
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Thickness and dimension |
Thickness deviation（mm） |
±0.02mm |
±0.04mm |
±0.08mm |
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Horizontal/longitudinal thickness uniformity |
The thickness deviation of any two points in the horizontal/longitudinal direction of 25mm is less than 15 μm; the thickness deviation of any two points in the horizontal/longitudinal direction is less than 25 μm; the thickness deviation of any two points in the horizontal/longitudinal direction is less than 50 μm. |
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length (m) |
≧ normal size |
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width(mm) |
≧normal size |
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Surface roughness （Rz） |
15-70 |
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Moisture (%) |
0.35~0.55 |
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Thermal shrinkage rate ( 60℃/15min)(%) |
≦ 12.0 |
≦ 8.0 |
≦ 5.0 |
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Tap value |
≥7 |
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Visible light transmittance(%) |
≧ 80 |
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Haze(%) |
＜ 0.6 |
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Tensile Strength (MPa ) |
≧20.0 |
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Elongation at break (% ) |
≧ 200 |
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Yellow index(%) |
≦10 |
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Note 1: Dense presence means that within a circle of 300 mm diameter, there are 10 points of point defects, and the adjacent defect spacing is ≦5 mm. |
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