JB/T 7984.1-1999 This standard is a revision of JB/T 7984.1-95 "Determination of pH value of common abrasives". During the revision, only editorial changes were made according to relevant regulations, and the main technical content remained unchanged. This standard specifies the determination method of pH value of corundum and silicon carbide abrasives. This standard is applicable to corundum and silicon carbide abrasives used in the manufacture of bonded abrasives and coated abrasives. This standard was first issued on April 15, 1983 as GB 3620-83 and was adjusted to JB/T 7984.1-95 in April 1996. JB/T 7984.1-1999 Determination of pH value of common abrasives JB/T7984.1-1999 Standard download decompression password: www.bzxz.net

JB/T 7984.1-1999
This standard is a revision of JB/T7984.1-95 (original GB3602-83) <Method for determination of pH value of general abrasives>.
This standard has no technical changes compared with JB/T7984.1-95, and has only been re-edited according to relevant provisions. This standard replaces JB/T7984.1-95 from the date of implementation (1). This standard is proposed and managed by the National Technical Committee for Standardization of Abrasives and Grinding Tools. The originating unit of this standard is: China Institute of Abrasives and Grinding Tools, the main drafter of this standard is: Cheng Ruida,
Machinery Industry Standard of the People's Republic of China
Ordinary Abrasives
pH Value Determination Method
This standard specifies the pH value determination method of pressed and silicon carbide abrasives. This standard is applicable to the manufacture of bonded abrasives and coated tools and other purposes. 2 Reference Standards
JB/T7984.1--1999
Replaces JB/T 7984.1--96
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was issued, the versions shown were valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T4676-1984 General Abrasive Sampling Method 3 Complete Text
This standard adopts the following definitions. bZxz.net
PH is the concentration of hydrogen ions in the solution obtained after the abrasive is treated with neutral water, that is, the acidity (or carbon content). 4. Sample preparation
According to GB/T4576, take samples and reduce them to 100~150g, put them into the test slurry, dry them in a supply box at 105℃±5℃ for 1h, then take them out and put them in a dryer. Cool to room temperature and set aside. Tools, instruments and test specifications
5.1 pH meter.
Male flask
GG type flask. Volume is 250mL. The bottom of the new flask is immersed in the precipitated water and boiled for 20 minutes. It can be used after inspection without dissolution characteristics that affect the pH value.
The surface of the flask is damaged or has a lot of damage, so it should be replaced in time. 5.3 Beaker
Volume 50mL
5.4 Distilled water
Newly prepared distilled water is allowed to be used within 48 hours, and the pH value should be 7±0.2.5.5. The simplest
200g5 weight 0.2g.
Approved by the State Machinery Industry Bureau on May 20, 1999 and implemented on January 1, 2000
Determination method
JB/T 7984. 11999
Weigh 25g of the sample into a flask, add 100mL of boiling distilled water, place it on a 1000W electric heater and continue to heat and boil for 6.1
3min, remove it, and quickly cool it with running water to 25℃±2℃. Within 20min, transfer the upper layer to a dry beaker and measure its pH value with a pH meter. The reading is taken to two decimal places. 6.2 For the same test, at least 10 ...
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