GB/T 30709-2014Standard test method for compressibility and recovery of laminated composite gasket materials (English PDF)

1 Scope

This standard specifies the laminated composite gasket material (two or more chemically distinct material laminated composite together) at room temperature for a short time

Determination of compression rate and rebound rate.

This standard applies to laminated composite gasket material. This standard does not apply to long-term under pressure laminated composite gasket material compression ratio (usually

Referred to as "creep") or spring rate (the opposite is usually referred to as "compression set") test, also did not consider the situation in a non-room temperature test.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein

Member. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 20671.1-2006 non-metallic materials Classification system and test methods - Part 1 Gasket. non-metallic gasket materials classification system

3 test device

The test device consists of the following components.

a) pressure head. the bottom of hardened and polished steel cylinder, depending on the type of material being measured and the provisions of different diameters (error

Within ± 0.02mm). Various types of laminated composite gasket material applies pressure head diameter shown in Table 1.

b) dial gauge. the test specimen thickness of a display or a few indicator, dividing the value of not more than 0.02mm, the readings should be read accurately estimate

To 0.002mm.

c) First load device. First load should be included in the predetermined value ± 1% or less of the weight of the head and additional weight errors. First load of

22.2N.

d) Main load device. applying a predetermined load to the master device indenter. The counterweight means may be formed, hydraulic cylinder, pneumatic cylinder or other

It provides the main load device component. Its slow loading rate should be uniform, accuracy of ± 1%. Main load shall be applied to a prescribed

First load on. Different types of laminated composite gasket material applicable to the main load as shown in Table 1.

Table 1 test load regulation and laminated composite gasket material

Non-metal layer gasket

Type of material

Six basic classification system

The first two codes Code

Adjustment Program

Head diameter mm

Load

Load

Total load (First, the main load

Sum)

N MPa

Roll asbestos

Asbestos Beater

Flexible graphite

F11

F12

F51, F52

100 °C ± 2 °C under the baking 1h, placed containing chloride anhydrous

Calcium dryer cooled to 21 °C ~ 30 °C

10,901,112 6.4 22.2 34.5 […]