GB/T 33832-2017Determination of water resistance of glass fiber (English PDF)

Foreword

This Standard was drafted as per the rules specified in GB/T 1.1-2009.

1 Scope

This Standard specifies two methods for determination of water resistance of glass fiber.

--- Method A: mass loss method;

--- Method B: monofilament tensile breaking strength retention rate method. This method is not applicable to the chopped tows with length less than 3cm.

This Standard is applicable to the determination of water resistance of glass fiber in tow shape.

2 Normative References

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.

GB/T 1033.1 Plastics - Methods for Determining the Density of Non-Cellular Plastics - Part 1: Immersion Method, Liquid Pycnometer Method and Titration Method

GB/T 6682 Water for Analytical Laboratory use - Specification and Test Methods

GB/T 7690.5 Reinforcements - Test Method for Yarns - Part 5: Determination of Fiber Diameter for Glass Fiber

GB/T 11415 Laboratory Sintered (Fritted) Filters - Porosity, Grading, Classification and Designation

GB/T 31290 Carbon Fiber - Determination of the Tensile properties of Single-Filament Specimens

3 Specimen Pre-Treatment

3.1 For the continuous fiber tow, cut it into 250mm long section; take about 20g; one end shall be bounded by the fine nylon; then place it into the dryer (diameter of 180mm) containing 700mL acetone (analytically pure) or other soluble organic solvent of impregnant; the fiber with free end shall be spread as much as possible; sealing and soaking for at least 24h till the residual amount of impregnant is no greater than 0.1%.

Take out, use anhydrous ethanol (analytically pure) to wash for 3 ~ 4 times; and stroke the fiber sot that it becomes neat yarn bundle. Cut 100mm long section fiber from the free end, place into 105°C±2°C constant temperature drying oven to dry to the constant weight; take out; place into the dryer (with silicone) to cool off to the room temperature for backup.

3.2 Take 10g of chopped tow; place into the dryer (diameter of 180mm) containing 700mL acetone (analytically pure) or other soluble organic solvent of impregnant; sealing and soaking for at least 24h till the residual amount of impregnant is no greater than 0.1%. Take out, use anhydrous ethanol (analytically pure) to wash for 3 ~ 4 times; place into 105°C±2°C constant temperature drying oven to dry to the constant weight; take out; place into the dryer (with silicone) to cool off to the room temperature for backup.

3.3 When it is required to determine the water resistance of fiber glass containing impregnant, acetone or other organic solvent is unnecessary to be used to soak; directly dry it for backup.

4 Method A: Mass Loss Method

5 Method B: Monofilament Tensile Breaking Strength Retention Rate Method

5.2.3 Constant temperature drying oven, the temperature shall be controlled at 105°C±2°C.

5.2.4 Tensile tester shall conform to the provisions of GB/T 31290.

6 Precision

The repeatability limit of mass loss method can refer to Table 1. […]