Paint chemicals

Polyvinyl butyral interlayer is a thin film of uniform thickness that has been processed and extruded from PVB resin mixed with plasticizer and additives. Its unique characteristics are: impact resistance, penetration resistance, sound insulating, and UV-proof. Moreover, PVB film can hold the debris from shattered glasses to protect the end users. Currently, most automotive windshields are required to adopt PVB laminated glass. PVB films are also used for the glass on high-rises and landmark architectures.

Polyvinyl Butyral Interlayer (PVB Film): Properties and Applications

Table 1: Key Properties of PVB Interlayer Film

Property	Typical Value	Importance
Thickness Range	0.38-1.52 mm	Determines impact resistance and optical clarity
Light Transmittance	>90%	Critical for architectural and automotive glass
Tensile Strength	20-30 MPa	Ensures structural integrity under stress
Elastic Modulus	1-2 GPa	Provides flexibility for impact absorption
Adhesion Strength	10-20 N/cm	Maintains glass bonding during breakage
Operating Temperature	-20°C to 60°C	Suitable for most environmental conditions

Table 2: Primary Applications of PVB Film

Industry	Application	Key Benefit
Automotive	Windshields and windows	Safety glass that holds fragments when broken
Construction	Architectural glass	UV protection and sound insulation
Photovoltaic	Solar panel encapsulation	Durability and optical clarity
Defense	Bullet-resistant glass	Multiple layers provide ballistic protection
Display	Touch screen protection	Scratch resistance and impact absorption

Table 3: Comparison with Alternative Interlayer Materials

Material	Advantages	Disadvantages
PVB	Excellent adhesion, proven safety record	Moisture sensitive, requires careful storage
EVA (Ethylene Vinyl Acetate)	Lower processing temperature	Lower impact resistance
TPU (Thermoplastic Polyurethane)	High flexibility and tear strength	Higher cost, optical clarity issues
Ionoplast	Better moisture resistance	Less flexible, higher processing temperature

Table 4: Manufacturing Parameters for PVB Film

Parameter	Typical Value	Importance
Extrusion Temperature	180-220°C	Ensures proper flow and homogeneity
Plasticizer Content	25-30%	Controls flexibility and adhesion
Drying Conditions	60°C, <1% RH	Prevents moisture absorption
Lamination Pressure	10-15 bar	Ensures bubble-free bonding
Lamination Temperature	120-150°C	Activates adhesion properties

Table 5: Safety and Performance Standards

Standard	Application	Requirement
ANSI Z97.1	Architectural glass	Impact resistance
FMVSS 205	Automotive glass	Penetration resistance
EN 12600	Building glass	Impact performance
UL 752	Bullet-resistant	Ballistic protection levels
IEC 61215	Solar modules	PV durability requirements

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