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There are several standards that collect test methods for haze measurement
.
In the following subsections we will discuss UNE-EN 2155-9, ASMT D 1003 and ISO 1782
.
The UNE EN 2155-9 standard refers to "Aerospace materials" under its own title
.
Test methods for transparent materials for glazing in aerospace construction
.
Turbidity determination
.
The purpose of this standard is to describe a method for the determination of turbidity in flat parts of transparent plastic materials using an integrating sphere-based device
.
The integrating sphere is used to collect the transmitted light flux
.
However, according to the standard, this method is not recommended to determine turbidity when values greater than 30% are obtained
.
The UNE EN 2155-9 standard states that the percentage of haze is obtained from the following formula: According to the standard, the percentage must be expressed in an approximate value of 0.
1%, while the thickness of the specimen must be measured in millimeters, approximately 0.
02 mm
.
ASTM D 1003ASTM D1003, "Standard Test Method for Haze and Light Transmission of Transparent Plastics," provides two procedures for light transmission and haze measurements
.
This method covers the evaluation of the specific light transmission and wide-angle light scattering properties of planar cross-sections of materials such as substantially transparent plastics
.
Regarding the two procedures indicated by the standard, procedure A uses a hazemeter and procedure B uses a spectrophotometer
.
International Organization for Standardization ISO 14782 Certification on ISO 14782, "Plastics
.
"Determination of the haze of transparent materials", specifies a method suitable for measuring haze values of less than 40%
.
In this method, the haze is determined by an integrating sphere, which is compensated to keep the efficiency constant
.
The method shows that it is necessary to Perform the four measurements given in the table below: Like UNE-EN 2155-9, the ISO 14782 standard specifies the following formula to calculate haze: τ1 is the intensity of the incident light
.
τ2 is the intensity of the light transmitted by the sample
.
τ3 is the intensity of light scattered by the instrument.
τ4 is the intensity of light
scattered
by the instrument and the sample
.
.
In the following subsections we will discuss UNE-EN 2155-9, ASMT D 1003 and ISO 1782
.
The UNE EN 2155-9 standard refers to "Aerospace materials" under its own title
.
Test methods for transparent materials for glazing in aerospace construction
.
Turbidity determination
.
The purpose of this standard is to describe a method for the determination of turbidity in flat parts of transparent plastic materials using an integrating sphere-based device
.
The integrating sphere is used to collect the transmitted light flux
.
However, according to the standard, this method is not recommended to determine turbidity when values greater than 30% are obtained
.
The UNE EN 2155-9 standard states that the percentage of haze is obtained from the following formula: According to the standard, the percentage must be expressed in an approximate value of 0.
1%, while the thickness of the specimen must be measured in millimeters, approximately 0.
02 mm
.
ASTM D 1003ASTM D1003, "Standard Test Method for Haze and Light Transmission of Transparent Plastics," provides two procedures for light transmission and haze measurements
.
This method covers the evaluation of the specific light transmission and wide-angle light scattering properties of planar cross-sections of materials such as substantially transparent plastics
.
Regarding the two procedures indicated by the standard, procedure A uses a hazemeter and procedure B uses a spectrophotometer
.
International Organization for Standardization ISO 14782 Certification on ISO 14782, "Plastics
.
"Determination of the haze of transparent materials", specifies a method suitable for measuring haze values of less than 40%
.
In this method, the haze is determined by an integrating sphere, which is compensated to keep the efficiency constant
.
The method shows that it is necessary to Perform the four measurements given in the table below: Like UNE-EN 2155-9, the ISO 14782 standard specifies the following formula to calculate haze: τ1 is the intensity of the incident light
.
τ2 is the intensity of the light transmitted by the sample
.
τ3 is the intensity of light scattered by the instrument.
τ4 is the intensity of light
scattered
by the instrument and the sample
.
