The light fastness refers to the degree of lightfastness of the dyed fabric, that is, the degree of discoloration and discoloration of the dyed fabric under the illumination of sunlight or artificial light sources.Sunlight fading is a relatively complicated process. Under the illumination of light, the dye absorbs light energy, and the molecules are decomposed or rearranged to cause discoloration and discoloration. The fading mechanism is different, such as the fading of azo dyes on cellulose fibers, mainly due to the oxidation of dyes by air under the illumination of light, and its fading on protein fibers is often the result of reduction. According to international standards, the light fastness is divided into 8 grades, the lowest grade 1 is equivalent to fading after exposure to sunlight for 3 hours; the highest grade 8 is equivalent to fading at 384 h after exposure to sunlight. The evaluation method is based on the comparison of the blue wool standard. The standard is a wool fabric dyed with 8 different light fastness blue dyes, and the degree of solarization between them is geometrically spaced. That is, level 2 sun 57 h, level 3 sun 112 h, level 4 sun 166 h, level 5 sun 220 h, level 6 sun 275 h, 7 level sun 329 h. Under normal circumstances, the light fastness can reach 4, and the special requirements for high light fastness can reach 5 levels. However, in the actual test, since the intensity of the sunlight is unstable, the test results are also different, so the artificial light source (the xenon arc lamp, the carbon arc lamp) is used to test the light fastness. The general methods are now GB/T8427-1998 "Test Method for Xenon Arc Lamps"; ISO 105-B01-1994 "Textile Fastness Test Part B01: Light Fastness", ISO 105-B02-1994 "Textile Colors" Fastness test Part B02: Resistance to artificial light fastness Xenon arc lamp fading test, ISO 105-B05-1993 "Texture fastness test of textiles Part B05: Detection and evaluation of photochromism"; AATCC139-2000 "Lightfastness" Color fastness: detection of photochromism, AATCC 169-2003 "Textile weatherability: Xenon arc lamp irradiation"; JIS L 0841-2004 "Sunlight fastness test method", JIS L 0842-2004 Test method for dyeing fastness of ultraviolet carbon arc light, JIS L 0842-1998 "Test method for dyeing fastness of xenon arc resistance". Recommended test equipment： GT-3000 Light Weather Fastness Tester GT-D01 Suntest & Xenon Arc Testers GT-D01B Colorfastness to Ozone GT-D02A-1 Light Fastness Tester-RT GT-D02C Carbon Arc Lamp Colorfastness to Weathering Tester

Respecting and loving the elders are the traditional virtues of the Chinese nation. September 29, 2019, GESTER organized a group to go to several community sites in Licheng District, this activity aimed to help the special elders--who are lonely, childless and even without family. Our volunteers took milk, edible oil, rice, quilt and so on to visit them in an orderly manner and carry out services. They were very delighted and moved by our arrival. We chatted with them, checked healthy situation for them, and spent a brief while pleasant time with them. When we were ready to leave, they were very reluctant to let us go. We sincerely hope that they will be healthy and enjoy their old age. We GESTER practiced public good with practical actions, meanwhile, hereby we call on everyone to pay more attention to this special lonely elderly group and try yourself  can to help them. We will continue to carry forward the spirit of GESTER and carry out more charity activities to deliver warmth, give back to society.

The year is the annual National Day on October 1, the birthday of our great motherland. Along with ups and downs, it's been 70 years of our mothers, this day, this nation will celebrate the festival at the venue. GESTER will be closed from 01st to 07th Oct.2019 for Chinese National Day.If any urgent issue, please contact: info@gester-instruments.com Happy National Day!

The Luggage zipper reciprocating fatigue tester is a special instrument for detecting the fatigue strength of various zippers. Under the action of lateral and longitudinal tension, the instrument can withstand the reciprocating pull operation of a specified number of times. The machine drives the zipper at a constant speed during the test. Pull the head and do the reciprocating movement 30 times per minute until the specified number of times. The applicable standards are summarized as follows: China QB/T 2171-2014 metal zipper QB/T 2172-2014 injection zipper QB/T 2173-2014 nylon zipper Japan JIS S 3015-2007 Japanese zipper standard United Kingdom BS 3084-2006 British zipper standard Australia AS 2332-2003 Australian zipper standard United States ASTM D2061-2007 zipper strength standard test ASTM D2062-03 (2009) Standard Test Method for Zipper Performance ASTM D2051-03 (2009) Standard Test Method for Washing Life of Zipper Coatings ASTM D2052-2005 Standard Test Method for Color Fastness of Zipper Dry Cleaning ASTM D2053-2004 Standard Test Method for Color Fastness of Zipper Light ASTM D2054-2004 Standard Test Method for Testing Color Fastness of Zipper Bands Using Friction Decolorization ASTM D2057-2004 Standard Test Method for Color Fastness to Wash of Zippers ASTM D2058-03 (2009) Standard Test Method for Wear Resistance of Dry Cleaning Coatings ASTM D2059-2003 Standard Test Method for Resistance to Salt Spray Corrosion of Zippers GESTER luggage zipper testing machine: Zipper Fatigue Tester GT-C39A, Zipper Rotation Testing Machine GT-C39B

Toys Testing Equipment Nail Bed Flammable Tester is suitable for the burning performance test of cloth toys and filling materials. Perform flammability tests on solid and soft toys and fix samples. The sample to be tested is placed on the nail bed, the sample is ignited by a fire source, the combustion state of the sample is observed, and the combustion performance of the sample is evaluated. Standard: ASTM F963 Nail Bed Flammable Testing Equipment Test Method: 1.Put the specimen on the flammability testing nailed fixture according to the standard. 2.Hold the burning paraffin candle whose flame height is 16mm, maintain the contact of candle with the specimen for 5s or until ignition occurs. 3.If the specimen melts away from the flame, remove the candle and maintain contact for the full 5s or until the specimen ignites. 4.If the ignitions occurs immediately, hold the candle steady and allow the ignited flame to move away. 5.Check the burning statue according to standard ASTM F963 Annex 5. Calculate the burning speed.

The Mid-Autumn Festival falls on the 15th day of the 8th lunar month， usually in early September to early October of the Gregorian calendar with full moon at night. It is a time for family members and loved ones to congregate and enjoy the full moon - an auspicious symbol of abundance，harmony and luck. Adults will usually indulge in fragrant mooncakes of many varieties with a good cup of piping hot Chinese tea， while the little ones run around with their brightly-lit lanterns. The Mid-Autumn Festival probably began as a harvest festival. The festival was later given a mythological flavour with legends of Chang-E， the beautiful lady in the moon. To celebrate the Mid-Autumn Festival, GESTER will report a Mid-Autumn Festival cake every year. After the gathering, everyone will have a dinner together. Our company will have a holiday on September 13(Friday) to September 15 (Sunday) holiday, a total of 3 days off. GESTER wish you a happy Mid-Autumn festival.

Abrasion testing is one of the item that many materials must be tested at present. It is also an important index to determine the physical properties of materials, so as leather abrasion resistance test.The main testing methods for leather abrasion resistance are the Gakushin Abrasion Method, the TABER Abrasion Method and the Martindale Abrasion Method. Gakushin Abrasion Testing Method To testing the degree of damage and decolorization of dyed leather used in shoe upper and lining leather after friction. The test method is to wrap the dry or wet white abrasion fabric on the friction head, then repeated friction on the test piece clamped on the test bench of Gakushin Abrasion Tester. Martindale Abrasion Method This method mainly used wear resistance of textile fabric and leather materials. It specifies Martindale Abrasion Tester for testing. A circular specimen, mounted in a specimen holder and subjected a defined load, is rubbed against an standard fabric in a translation movement tracing a LIssajous figure. The evaluation of the abrasion resistance of the textile fabric or leather is determined from the inspection interval to breakdown of the specimens. Taber Abrasion Method This method is complied with ASTM D3884.The principle:A specimen is placed on a rotating platform and rubbed by the sliding rotation of two abrading wheels. One abrading wheel rubs the specimen outward the periphery and the other, inward toward the center. Thus forming a circular wear mark. After the specified number of frictions, the resistance of abrasion of the sample is evaluated by appearance. Taber Abrasion Tester can simulate the real working conditions or meet the test conditions prescribed by the standard. Also can use different abrasive medium and accessories to do the different test.

Do you have any embarrassing situation in your clothing that has been broken by a sharp object? In real life, our clothes will be broken and torn when worn, which involves the problem of strong tearing of the fabric. Then what is the tear strength? Fabric tear Fabric tearing also referred to as tearing,fabric partial yarn is subjected to a concentrated load to tear the fabric apart. During the use of the fabric, the clothes are hooked by the object, partial yarn is pulled apart by force, so that the fabric forms a strip or a triangular crack, which is also a phenomenon of breakage. Tear Strength It can reflect the degree of catalysis of the finished fabric, so the tearing strength test is performed on the resin-finished cotton fabric and the wool-formed pure or blended combed fabric. Knitted fabrics are generally not subjected to tear test except for special requirements. How to judge if the tear strength of your clothes is qualified or not? There are many methods for the tear strength test: 1. Pendulum method 2. Pants type method (including single tongue method and double tongue method) 3. Trapezoid method 4. Wing method. The most common test method is the pant-shaped single tongue tear test. And how to test it? Cut the sample as belows picture shown according the standard required. Standard require each sample cut into two test sample. One is lengthways. The other one is crosswise. Each test sample should be included at least 5 pieces. Then on test. When the stressed yarn in the sample is separated up and down gradually, the yarn that is not directly stressed begins to have some relative sliding with the stressed yarn., and gradually draws closer to form an approximate triangular area, which is usually called the stressed triangle. Due to the effect of friction resistance between the yarns, the sliding is finite, that is, the number of yarn roots under stress in the triangle is limited.In the stress triangle area, the stress on the bottom edge of the first yarn is the largest, and decreases successively. When it is sliding, the tension of the yarn increases rapidly,  the elongation of the yarn also increases sharply. When the first yarn constituting the bottom edge of the force-triangle triangle is deformed to the elongation at break, the yarn breaks. Thereby a maximum value of a certain tear load is obtained. The next yarn then begins to become the bottom edge of the force triangle, so that the yarn of the non-pull system breaks one at a time to tear the fabric. Lastly, the calculating.the electronic calculation devices divides the first peak and the last peak into four regions,exclude the first region, and records all the peaks in the rest of three region. The average value was calculated and the tear strength of this sample was recorded. (The unit is indicated by N) Testing Equipment: GT-C01-1 Universal Tensile Strength Tester (Dual Column)