Moisture resistant microbial penetration tester

Five finger scratch tester

1、 Introduction

The tester is widely used in automobile industry. It mainly tests the wear resistance of smooth and striated plastic ornaments in automobile interior and exterior decoration parts. In addition to the development of materials and products, it is also applicable to quality control. Five finger scratch / scratch tester is designed for plastic material evaluation, hard material wear resistance, paint, ink, soft metal, oil carpet, accessories and other materials testing. The instrument meets a variety of test standards, and can customize the movement path, speed and cycle of the test platform according to customer requirements. Five finger scratch tester test: the sample on the test platform contacts five scraping fingers or one plastic scraping finger and the weight applied above. During the test, the test platform moves and scratches are left on the surface of the specimen. The scratch resistance of the specimen was judged according to the depth of the scratch. The sample can be plastic plate, test plate coated with paint and varnish, etc.

2、 Testing principle

Five finger scratch tester test: the sample on the test platform contacts five scraping fingers or one plastic scraping finger and the weight applied above. During the test, the test platform moves and scratches are left on the surface of the specimen. The scratch resistance of the specimen was judged according to the depth of the scratch. The sample can be plastic plate, test plate coated with paint and varnish, etc.

3、 Technical parameters:

1. Travel range: 10-200 mm

2. Speed range: 10-200 mm / S

3. Speed buffer: 10 ± 1mm

4. Metal scraping head diameter: 0.5mm, 0.75mm, 1mm (erichsen318), 3mm, 5mm, 7mm

5. Material of metal scraping head: tungsten carbide uses tungsten carbide as scraping finger to reasonably detect the surface wear damaged by unconventional defined physical forms (such as scraping, scratching, planing, etc.).

6. Total weight of pressure weight and scraping component: 2n, 3N, 5N, 7n, 8N, 10N, 12n, 15N, 20n (optional) mass error shall not exceed 1%. In addition, customized weight can be selected

7. Plastic scraping finger: diameter of PMMA is 16mm, thickness is 1mm, radius of scraping finger edge is 0.5mm, hardness is shore d852

4、 Test standard

5. The following criteria are met:

FORD FLTM BN 108-13

GMW 14698 (method B)

FORD BO-162-01

5、 In the evaluation of scratch test results, the common test methods can be divided into visual evaluation method and instrument evaluation method

The visual rating method is to place the test sample under the illumination of northern sky sunlight or D65 artificial light source, and the test sample is in a horizontal state relative to the evaluator. If necessary, rotate the sample to obtain the most Jia observation angle. For linear scratch, only 80% of the middle part is evaluated in the evaluation process. The evaluation content mainly includes whether there are damage scratches on the surface of the test sample, whether the material is deformed, whether there is cracking and hairiness. According to the different materials, the evaluation standards are also different.

The instrument rating method mainly evaluates the color and gloss changes of test samples according to the optical detection instrument.

a. Color changes. There are different measurement methods and inspection indicators, for example, according to ISO 7724-1 or other similar standards, the CIELab color space is used to measure the scraped part of the test sample under the conditions of 100 observers, D65 lighting source, including the environmental gloss components, integrating sphere measurement method specified in other similar standards, and CIELab color space, under the conditions of 100 observers, D65 lighting source, 450 / 00 or 0 ° / 45 ° measurement geometry, etc The color change of rubbing part is △ L *, △ a *, △ h * and △ e *.

b. Gloss changes. According to the method specified in ISO 2813 or other similar standards, measure the change of 600 or 200 specular gloss between the scratched part and the non scratched part of the test sample.