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JJG 878-2025 English PDF

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Q: Should I purchase the latest version JJG 878-2025?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 878-2025 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$439.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJG 878-2025: Verification Regulation of Extrusion Plastometers
Status: Valid

JJG 878: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 878-2025	439	Add to Cart	4 days	Verification Regulation of Extrusion Plastometers	Valid
JJG 878-1994	349	Add to Cart	3 days	Verification Regulation of Extrusion Plastometer

Basic data

Standard ID: JJG 878-2025 (JJG878-2025)
Description (Translated English): Verification Regulation of Extrusion Plastometers
Sector / Industry: Metrology & Measurement Industry Standard
Word Count Estimation: 21,297
Date of Issue: 2025-02-08
Date of Implementation: 2025-08-08
Issuing agency(ies): State Administration for Market Regulation

JJG 878-2025: Verification Regulation of Extrusion Plastometers

---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.
National Metrology Verification Regulations of the People's Republic of China Melt flow rate meter calibration procedures Released on 2025-02-08 2025-08-08 Implementation The State Administration for Market Regulation issued Melt flow rate meter calibration procedures Replace JJG 878-1994 Responsible unit. National Physical and Chemical Metrology Technical Committee Drafting unit. China Institute of Metrology This regulation is interpreted by the National Physical and Chemical Metrology Technical Committee Drafters of this Regulation. Qi Xin (China National Institute of Metrology) Wang Meiling (China National Institute of Metrology)

Introduction (II) 1 Scope(1) 2 References(1) 3 Terminology and units of measurement (1) 4 Overview(2) 5 Metrological performance requirements (2) 6 General technical requirements (3) 6.1 Appearance inspection (3) 6.2 Power-on inspection (3) 7 Measuring instrument control (3) 7.1 Verification conditions (3) 7.2 Measuring standards and supporting equipment (3) 7.3 Verification items and verification methods (4) 7.4 Processing of test results (7) 7.5 Verification cycle (7) Appendix A Conditions for determining melt flow rate specified in standards for thermoplastic materials (8) Appendix B Melt Flow Rate Meter Calibration Original Record Format (10) Appendix C Verification Certificate/Verification Result Notice Inner Page Format (13)

Introduction

JJF1002-2010 "Rules for the Preparation of National Metrology Verification Procedures", JJF1001-2011 "General Metrology Terms and Definition” and JJF1059.1-2012 “Evaluation and Expression of Uncertainty in Measurement” together constitute the basis for the formulation of this regulation. A series of basic specifications. This regulation mainly refers to GB/T 3682.1-2018 "Mass flow rate of thermoplastic melts" Determination of melt volume flow rate (MFR) and melt volume flow rate (MVR) - Part 1.Standard method. Compared with JJG 878-1994, in addition to editorial modifications, the main technical changes are as follows. ---The metrological performance index of "sampling time interval error" is changed from "no more than ± 0.3%" stipulated in the original regulations "Not exceeding ±1.0%" (see Table 1); --- Added the metrological performance index of "piston rod displacement error" (see Table 1); --- Added the metrological performance index of "piston head diameter" (see Table 1); ---The measurement performance index of "barrel temperature fluctuation" has changed from "no more than 0.5℃ within 4 hours" stipulated in the original regulations to More "not more than 1.0℃ for 4 hours" (see Table 1); --- "Barrel temperature gradient" specifies the measurement performance indicators according to the test temperature range of the melt flow rate meter (see Table 1); ---The measurement error of melt flow rate meter is divided into melt mass flow rate (MFR) and melt volume flow rate There are two types of melt flow rate (MVR). When the melt mass flow rate (MFR) is The indicator was changed from "±10%" in the original specification to "±25.0%"; Melt Volume Flow Rate (MVR) When the instrument measurement error is 25.0%, the metrological performance index is "±25.0%" (see Table 1); --- Deleted the original regulations "Appendix 3 Standard Test Conditions" and "Appendix 4 Standard Substance Addition Amount and Sample Cutting Time" interval"; --- Added "Appendix A Conditions for Determining Melt Flow Rate Specified in the Standards for Thermoplastic Materials" (See Appendix A). The previous releases of this regulation are. ---JJG 878-1994. Melt flow rate meter calibration procedures

1 Scope

This procedure applies to the initial calibration, subsequent calibration and in-use inspection of extrusion type melt flow rate instruments.

2 References

This specification refers to the following documents. GB/T 3682.1-2018 Plastics Thermoplastics Melt Mass Flow Rate (MFR) and Melt Volume Determination of flow rate (MVR) Part 1.Standard method For any referenced document with a date, only the version with the date is applicable to this Regulation; for any referenced document without a date, The latest version (including all amendments) shall apply to this regulation.

3 Terminology and units of measurement

The following terms and definitions apply to this practice. 3.1 Melt mass flow rate (MFR) Under the conditions of specified temperature, load and piston rod position, the molten resin passes through the die of specified length and inner diameter. Extrusion rate. The mass extruded in a specified time is taken as the melt mass flow rate, in grams per ten minutes (g/10min), see formula (1). MFR(T,mnom)= 600×m (1) Where. T --- test temperature, ℃; mnom --- nominal load, kg; m --- average mass of cut segments, g; t --- cutting time interval, s. Note. The International System of Units (SI) allows the use of dg/min and stipulates that 1g/10min=1dg/min. [Source. GB/T 3682.1-2018, 3.1, modified] 3.2 Melt volume flow rate (MVR) Under the conditions of specified temperature, load and piston rod position, the molten resin passes through the die of specified length and inner diameter. Extrusion rate. The volume extruded in a specified time is taken as the melt volume flow rate, in cubic centimeters per ten minutes. (cm3/10min), see formula (2). MVR(T,mnom)= A×600×l (2) Where. T --- test temperature, ℃; mnom --- nominal load, kg; ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJG 878-2025_English be delivered?

Answer: Upon your order, we will start to translate JJG 878-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of JJG 878-2025_English with my colleagues?

Answer: Yes. The purchased PDF of JJG 878-2025_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 JJG 878-2025?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 878-2025 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.