Home Cart Quotation About-Us
www.ChineseStandard.net
SEARCH

GB/T 15904-2018 English PDF

Q: How long will the true-PDF of English version of GB/T 15904-2018 be delivered?

Upon your order, we will start to translate GB/T 15904-2018_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.

Q: Can I share the purchased PDF of GB/T 15904-2018_English with my colleagues?

Yes. The purchased PDF of GB/T 15904-2018_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Q: Does the price include tax/VAT?

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). Avoidance of Double Taxation Agreements (DTAs) between Singapore and 100+ Countries: https://www.iras.gov.sg/taxes/international-tax

Q: Do you accept my currency other than USD?

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.

Q: Should I purchase the latest version GB/T 15904-2018?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 15904-2018 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.

US$199.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 15904-2018: Rubber -- Determination of polyisoprene content
Status: Valid

GB/T 15904: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 15904-2018	199	Add to Cart	3 days	Rubber -- Determination of polyisoprene content	Valid
GB/T 15904-1995	194	Add to Cart	3 days	Rubber. Determination of polyisoprene content	Obsolete

Similar standards

GB/T 15254 GB/T 15252 GB/T 15256 GB/T 15340 GB/T 15906

Basic data

Standard ID: GB/T 15904-2018 (GB/T15904-2018)
Description (Translated English): Rubber -- Determination of polyisoprene content
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G40
Classification of International Standard: 83.060
Word Count Estimation: 10,127
Date of Issue: 2018-03-15
Date of Implementation: 2018-10-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 15904-2018: Rubber -- Determination of polyisoprene content

---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.
Rubber--Determination of polyisoprene content ICS 83.060 G40 National Standards of People's Republic of China Replacing GB/T 15904-1995 Rubber polyisoprene content determination Published by.2018-03-15 2018-10-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Administration released

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 15904-1995 Determination of Polyisoprene in Rubber. Compared with GB/T 15904-1995, the main The technical changes are as follows. ---Modified the standard name; --- Added warnings; --- Modified normative references (see Chapter 2, Chapter 2 of the.1995 edition); --- Removed the reagent "Trichloromethane (GB/T 682)" (1995 version 4.2); --- Modify "100mL single-mouth digestion flask" to "100mL three digestion flask" (see Figure 1,.1995 version of Figure 1); --- Increased analytical balance (see 5.4); --- Increased recommended temperature for distillation (see note in 6.4.2); --- Increased titration endpoint determination method (see 6.6.1); --- Modify the "acetone-trichloromethane (32.68) mixed solvent" as "acetone solvent" (see 7.2,.1995 version 7.2). This standard is proposed by China Petroleum and Chemical Industry Federation. This standard is sub-committee of the General Test Method for National Rubber and Rubber Products Standardization Technical Committee (SAC/TC35/SC2) In the mouth. Drafters of this standard. Fushun Yi Kesi New Materials Co., Ltd., Xishuangbanna Comprehensive Quality and Technical Supervision Center, Beijing Municipal physical and chemical analysis and testing center, Beijing Rubber Industry Research and Design Institute, Shenyang City Chemical School. The main drafters of this standard. Lin Qingju, Wang Longqing, Li Baowei, Bi Xuerui, Fan Yijing, Zhao Jianye, Cang Feifei, Zhang Cuicui, Niu Huafeng, Xiao Rui, Ding Xiaoying, Wang Chunlong. The previous versions of the standard replaced by this standard are. --- GB/T 15904-1995. Rubber polyisoprene content determination Warning—People using this standard should be familiar with regular laboratory practices. This standard does not indicate all safety issues related to it question. It is the user's responsibility to take appropriate safety and health measures and to ensure compliance with the relevant provisions of national laws and regulations. Note. Some of the steps specified in this standard may generate some substances or waste, which may bring danger to the local environment harm. After use, these substances should be handled safely and disposed of with reference to appropriate documents.

1 Scope

1.1 This standard specifies the determination method for the content of polyisoprene in rubber, ie natural rubber, isoprene, balata, and gutta-percha. Including natural, isoprene latex solids, solid rubber and vulcanized rubber or unvulcanized rubber. 1.2 The complexing agents in soft glue, such as carbon black, mineral oil and sulfur, have no interference effect (see Tables 1 and 7.2). If there is vinyl acetate polymerization This method does not apply. 1.3 This method is applicable to the combination of rubber and butylbenzene, butadiene and nitrile rubber described in 1.1. If halogenated rubber is available, the measurement procedure must be corrected according to 6.6.3. Because the halogenated rubber can also react with chromic acid and cause some interference, if It is the main body of the combined glue that may hinder the reaction of polyisoprene with chromic acid. Therefore, check and eliminate with a known mixture containing interfering rubber Is it complete? 1.4 This method is also suitable for the determination of polyisoprene content in reclaimed rubber, but the measured value is always lower than the estimated value. 1.5 In addition to the various rubbers described in 1.3, if there are other rubbers (eg. chlorosulfonated polyethylene rubber, ethylene propylene diene rubber, butyl rubber, chlorine Butyl rubber and brominated butyl rubber), the digestion time needs to be adjusted. The measured value needs to be similar and corrected by comparison with the results obtained by using glue, otherwise Method does not apply. The difference in the polysulfide rubber used in the rubber composition was greatest (see Table 2).

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. Preparation of GB/T 601 Chemical Reagent Standard Titration Solution GB/T 3516 Determination of Rubber Solvent Extracts GB/T 4497.1 Determination of total sulfur content of rubber - Part 1. Oxygen cylinder combustion method GB/T 6682 Analysis Laboratory Water Specifications and Test Methods GB/T 8290 concentrated natural rubber latex sampling GB/T 15340 Natural and synthetic raw rubber sampling and sample preparation method

3 Principle

The polyisoprene in the sample is digested with a mixture of sulfuric acid and chromic acid, and the formed acetic acid is distilled off with steam, and the gas is distilled to remove the distillate. Carbon dioxide. Then acetic acid was titrated with sodium hydroxide solution. Under the specified test conditions, the yield of acetic acid from isoprene units was 75%, and the results were calculated accordingly. ......

Image

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 15904-2018_English be delivered?

Answer: Upon your order, we will start to translate GB/T 15904-2018_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 15904-2018_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 15904-2018_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.

Question 5: Should I purchase the latest version GB/T 15904-2018?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 15904-2018 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.