GB/T 2410-2008Determination of the Luminous Transmittance and Haze of Transparent Plastics (English PDF)

Foreword

The modification of this Standard adopts ASTM D 1003.2007 Standard Test Method

for Haze and Luminous Transmittance of Transparent Plastics. Its technical content is

basically equivalent to this Standard. There are merely editorial modifications in the

text. Its compiling method is completely corresponding with this Standard.

This Standard serves as a replacement of GB/T 2410-1980 Transparent Plastics -

Transmissivity and Haze Test. In comparison with GB/T 2410-1980, there are several

main changes as follows.

---State conditioning is added;

---The tolerance of test temperature is modified from ± 5 °C into ± 2 °C;

---The tolerance of relative humidity is modified from ± 20% into ± 10%;

---Light source A is added;

---Sample thickness measurement accuracy is modified;

---Spectrophotometry is added;

---Appendix A "Derivation of Haze Calculation Formula" is added.

In this Standard, Appendix A is informative.

This Standard was proposed by China Petroleum and Chemical Industry Federation.

This Standard shall be under the jurisdiction of National Technical Committee 15 on

Plastic of Standardization Administration of China (SAC/TC 15).

The responsible drafting organization of this Standard. National Chemical Building

Materials Testing Center of SINOPEC Beijing Research Institute of Chemical Industry

(Material Testing Department).

The participating drafting organizations of this Standard. National Synthetic Resin

Quality Supervision and Inspection Center; China National Center for Quality

Supervision & Test of Plastic Products (Fuzhou); Guangzhou KINGFA Science &

Technology Co., Ltd.

1 Scope

This Standard stipulates two methods for the determination of luminous transmittance

and haze of transparent plastics. Method A is haze meter method. Method B is

spectrophotometry.

This Standard is applicable to the determination of luminous transmittance and haze

of transparent plastics in plate, sheet and thin-film state.

2 Normative References

Through the reference in this Standard, clauses of the following documents become

clauses of this Standard. In terms of references with a specific date, all the subsequent

modification sheets (excluding the corrected content) or the revised editions are not

applicable to this Standard. However, all parties that reach an agreement in

accordance with this Standard are encouraged to explore the possibility of adopting

the latest version of these documents. In terms of references without a specific date,

the latest version is applicable to this Standard.

GB/T 2918-1998 Plastics - Standard Atmospheres for Conditioning and Testing (idt

ISO 291.1997)

3 Terms and Definitions

The following terms and definitions are applicable to this Standard.

4 Samples

5 State Conditioning

Under the temperature of 23 °C ± 2 °C and the relative humidity of 50% ± 10%, in

accordance with GB/T 2918-1989, conduct state conditioning for not less than 40 h,

then, proceed with the test.

6 Test Environment

Test shall be conducted in the same environment as sample state conditioning.

7 Test Methods

8 Test Report

Test report shall include the following content.

Appendix A

(informative)

Derivation of Haze Calculation Formula

A.1 Haze formula shall be derived through the following two steps.

A.1.1 Luminous transmittance

Luminous transmittance, which is expressed in percentage, shall be calculated in

accordance with Formula (A.1).

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