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GB/T 39691-2020 English PDF

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US$249.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 39691-2020: Plastics - Determination of refractive index
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 39691-2020	249	Add to Cart	3 days	Plastics - Determination of refractive index	Valid

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Basic data

Standard ID: GB/T 39691-2020 (GB/T39691-2020)
Description (Translated English): Plastics - Determination of refractive index
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G31
Classification of International Standard: 83.080.01
Word Count Estimation: 13,192
Date of Issue: 2020-12-14
Date of Implementation: 2021-11-01
Quoted Standard: GB/T 2918-2018
Adopted Standard: ISO 489-1999, MOD
Regulation (derived from): National Standard Announcement No. 28 of 2020
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration
Summary: This standard specifies two test methods for determining the refractive index of plastics. Method A: Refractometer method. The refractometer is used to measure the refractive index of molded parts, die-cast or extruded plates or films. Suitable for isotropic, transparent, translucent, colored or opaque materials, and also suitable for anisotropic materials. When high-precision testing is required, this method is recommended. This method is not suitable for powder or granular samples. Method B: Microscopic immersion method (using the Baker line phenomenon). This method can be used to determine the refractive index of powdery or granular transparent materials. Generally speaking, monochromatic light should be used to avoid dispersion effects. This method is suitable for isotropic translucent materials and colored materials, but not for opaque materials and anisotropic materials.

GB/T 39691-2020: Plastics - Determination of refractive index

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Determination of plastic refractive index) ICS 83:080:01 G31 National Standards of People's Republic of China Determination of the refractive index of plastics (ISO 489:1999, MOD) 2020-12-14 release 2021-11-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee

Foreword

This standard was drafted in accordance with the rules given in GB/T 1:1-2009: This standard uses the redrafting method to modify and adopt ISO 489:1999 "Determination of Plastic Refractive Index": Compared with ISO 489:1999, this standard has more structural adjustments: Appendix A lists the chapters of this standard and ISO 489:1999: Article number comparison list: The technical differences between this standard and ISO 489:1999 and the reasons are as follows: --- Regarding normative reference documents, this standard has made adjustments with technical differences to adapt to my country's technical conditions and adjustments: The situation is collectively reflected in Chapter 2 "Normative Reference Documents", and the specific adjustments are as follows: ● Replace ISO 291:2008 with GB/T 2918-2018 which is modified to adopt international standards: This standard was proposed by the China Petroleum and Chemical Industry Federation: This standard is under the jurisdiction of the National Plastics Standardization Technical Committee (SAC/TC15): The main drafting units of this standard: China Blue Chenguang Chengdu Testing Technology Co:, Ltd:, Guangzhou Quality Supervision and Testing Research Institute, Anhui Huaiyuan Kanghua Plastic Products Co:, Ltd:, Shenzhen Zhongan Testing Standard Technology Co:, Ltd:, Qingdao Product Quality Supervision and Inspection Institute, People's Republic of China Qingdao Dagang Customs, Lianxing New Material Technology (Guangzhou) Co:, Ltd: The main drafters of this standard: Xie Peng, He Guoshan, Yang Lu, Zheng Ning, Zhao Yufen, Wang Zhi, Gao Jianguo, Wang Wanjuan, Shi Xinbo, Wang Xiaobin: Determination of the refractive index of plastics

1 Scope

This standard specifies two test methods for determining the refractive index of plastics: Method A: Refractometer method: The refractometer is used to measure the refractive index of molded parts, die-cast or extruded plates or films: Apply to each Isotropic, transparent, translucent, colored or opaque materials are also suitable for anisotropic materials: When high precision test is required, it is recommended to use this method: This method is not suitable for powder or granular samples: Method B: Microscopic immersion method (using the Baker line phenomenon): This method can be used to determine the refractive index of powdery or granular transparent materials: Generally speaking, monochromatic light should be used to avoid dispersion effects: This method is suitable for isotropic translucent materials and colored materials, but not Transparent materials and anisotropic materials:

2 Normative references

The following documents are indispensable for the application of this document: For dated reference documents, only the dated version applies to this article Pieces: For undated references, the latest version (including all amendments) applies to this document: GB/T 2918-2018 Standard environment for condition adjustment and testing of plastic specimens (ISO 291:2008, MOD)

3 Significance and use

3:1 The refractive index is a basic attribute that can be used to check the purity and composition of materials, and can be used to identify materials and design optical components: fold The change of light rate with temperature can indicate the transition point of the material: 3:2 When method B is used cautiously by experienced operators, the precision of method B is roughly the same as that of method A (see section Chapter 8):

4 Apparatus and materials

4:1 Method A 4:1:1 Abbe refractometer or any other refractometer that can give the same result, accurate to 0:001, and the measurement range of refractive index is from 1:300 To 1:700: Temperature control devices (4:1:3) shall be provided for the samples and prisms: 4:1:2 White light or sodium lamp as light source: 4:1:3 The temperature control of the water bath can keep the temperature of the main prism, sub-prism and sample at (23:0±0:5)℃: The circulating water should be distilled water: 4:1:4 Contact liquid: Warning---In the process of handling, storage and disposal, contact with liquid may harm the environment: Should comply with national and local safety management and disposal Regulations: The refractive index of the contact liquid should be higher than the refractive index of the tested material, and the plastic material must not be softened, corroded or dissolved: Liquids listed in Table 1 It can be used for corresponding plastic materials, but other liquids that meet these requirements can also be used: ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 39691-2020_English be delivered?

Answer: Upon your order, we will start to translate GB/T 39691-2020_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 39691-2020_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 39691-2020_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.