Packing Ring Performance Test Report

Product Name

Flexible Graphite Packing Ring

Sample Numbers

18010633-2 (Ordinary Graphite)

18010632-4 (Nuclear Grade Graphite)

18010994-6 (High-Temperature Resistant Graphite)

Product Batch Numbers

18010632, 18010633, 18010994

Quantity

3 sets (2 pieces per set)

Manufacturer

Zhejiang Magpie Sealing Co., Ltd

Product Specification

φ30*φ46*8

Date of Submission for Inspection

2017-01-11

Inspection Dates

From 2017-01-11 to 2017-01-12

From 2017-01-15 to 2017-01-19

From 2018-01-22 to 2018-01-26

Test Item

Under the same temperature and humidity conditions, corrosion of metal materials when equipped with different grades of graphite packing rings

Test Basis

JB/T 9143-1999 Method for Corrosion Test of Anti-corrosive Asbestos Packing

Test Equipment

Equipment Name: High and Low Temperature Chamber

Note

Valve Stem Material: 45# Steel

Graphite materials: 9104 is ordinary graphite; 9204 is nuclear-grade graphite; 9404 is high-temperature resistant graphite.

Item

9104 Ordinary Graphite

9204 Nuclear-Grade Graphite

9404 High-Temperature Resistant Graphite

Total Sulfur Content (mg/kg)

≤1200

＜200

＜200

Total Halogens Content (mg/kg)

--

＜200

＜200

Free Chlorine Content (mg/kg)

≤80

＜30

＜50

Free Fluorine Content (mg/kg)

--

≤50

＜50

Thermal Loss (450℃) (%)

≤1.0

≤0.5

＜0.3

Thermal Loss (600℃) (%)

≤20

≤20

＜3

Thermal Loss (700℃) (%)

--

--

＜12

Tensile Strength (MPa)

≥4

≥4.5

≥4.5

No.

Gasket No.

Size Specifications

Material

Test Parameters

Remarks

Temperature (℃)

Humidity (%)

Time (h)

Axial Clamping Force (MPa)

1

18010633-2

φ30*φ46*8

9104

55±2

95±3

5*24

1.5

Pitting observed at packing contact area

2

18010632-4

φ30*φ46*8

9204

55±2

95±3

5*24

1.5

Maintained original brightness

3

18010994-6

φ30*φ46*8

9404

55±2

95±3

5*24

1.5

Less than 1/3 area of packing contact lost luster

Assessment Standard

Grade 1

Maintained original brightness

Refer to the requirements in JB/T 9143-1999 Corrosion Test Method for Anti-corrosive Asbestos Packing

Grade 2

Less than 1/3 area of packing contact lost luster

Grade 3

Pitting observed at packing contact area

Grade 4

Severe corrosion at packing contact area

Results

□ Qualified      □Unqualified      √Other

Signature

Notes

Based on the comparison of the valve stem before and after testing:

18010632-4 (Grade 9204 Nuclear Graphite) is Grade 1.

18010994-6 (Grade 9404 High-temperature Resistant Graphite) is Grade 2.

18010633-2 (Grade 9104 Ordinary Graphite) is Grade 3.

Tested by

Reviewed by

Approved by

Date

Date

Date