When testing textile formaldehyde content, what should pay attention to

There are three main points for attention in the formaldehyde content test of textiles:

 

1. Selection of sample test quantity

2. Sample storage

3. Color rendering

 

Details of textile testing precautions:

 

1. Selection of the number of samples tested

If the formaldehyde content in the sample is too low, the number of samples should be increased from 1g to 2.5g to ensure the accuracy of the test results. This method complies with the provisions of GB/T2912.1 "Determination of Formaldehyde in Textiles Part 1: Free Hydrolyzed Formaldehyde (Water Extraction Method)".

 

Using different sample quantities and using the same test method will lead to different conclusions. Because according to GB/T2912.1 "Determination of Formaldehyde in Textiles Part 1: Free Hydrolyzed Formaldehyde (Water Extraction)", the measurement range is between 20-3500mg/kg, considering that the formaldehyde content is too low The linear relationship between absorbance and formaldehyde content may deviate from the factor of Beer's law, and the test conclusion of selecting a 2.5g sample is reasonable.


2. Sealing of samples

In the process of taking representative samples, the samples should be sealed up in a timely manner, otherwise the accuracy of the test results will be affected.

 

Samples should be randomly selected from each batch of products and sealed immediately, otherwise the test data will drop due to the volatilization of formaldehyde, which will affect the representativeness of the determination of formaldehyde content.

 

3. Color rendering

It is advisable to suck the extract into the test tube before the acetylacetone (Nessler's reagent) to prevent the oily acetylacetone from adhering to the test tube wall and affecting the absorbance reading.

 

The validity period of acetylacetone and the preparation process have an impact on the formaldehyde test, so strict management must be carried out to ensure that it is used within the validity period.

 

It should be noted that after completing the preparation of the acetylacetone reagent, it must be stored for 12 hours before use, otherwise it will affect the accuracy of the test. This is because the chemical properties of the Nessler reagent used for color development just after the preparation is completed It is not stable enough, and it usually takes 12 hours to reach stability. The glass bottles used for storage should be brown to prevent chemical reactions between light and reagents and affect the color rendering effect.

 

The test of formaldehyde content is a test with relatively high operational and technical requirements. There are also: calibration of the formaldehyde stock solution before the test, determination of the standard curve, control of the temperature and time during extraction of the extract, selection of spectrophotometer and colorimetry Matching selection of dishes; etc. These factors will have a direct impact on the test results, so necessary attention must be paid to improve the accuracy of the test results.


Gester instruments is a global leading textile testing instruments manufacturer with 20+ years experience.Expertly specialized in providing integrated laboratory testing solutions for children's products, textile, footwear and furniture. It has passed ISO 9001 certificate, "AAA Enterprise in Quality, Service and Credit" and was audited as SGS audited supplier.So far, GESTER owns two production factories and four sales teams for textile tester, footwear tester, Mask Tester and Protective Clothing Tester, Lab Incubator, Biological Safety Cabinet, Lab Oven etc. We have applied for dozens of patents from the State Intellectual Property Office.More about textile testing machines pls leave message to us,we will contact you by 24 hourse!

Comments

Post a Comment

Popular posts from this blog

Guide to Making Custom Dust Bags, Drawstring Bags

Guide to Making Custom Dust Bags, Drawstring Bags - Pouches or Drawstring Bags, Dust Bags, Drawstring Bags. Drawstring bags go by many names, and we've used them in this guide. They include custom drawstring bags, custom drawstring bags, custom dust bags, pouches or produce bags. Creating a simple custom dust bag or drawstring bag can lead to various decisions. To give it its own identity, you can choose fabrics, different drawstrings to close it, stoppers or "ends" on the drawstring, and embellish it with prints, embroidery, labels, and emblems. The list of finishing options is vast, so this guide is designed to help you navigate those choices. What is the purpose of your drawstring bag? Knowing what you need your custom bag for will help guide the answers to the questions you need to determine before pricing your own drawstring bag. E.g: Is it for leather products, so you might need a fancy dust bag for leather handbags? Or are you a gift shop and need gift wrap? Are yo
Read more

7 Eco-Friendly Tote Bags for Shopping

What Does the Plastic Bag Ban Mean? Some of the most adaptable people in the world, so the plastic bag ban will certainly not disrupt their daily lives for long. While the bag waste reduction law comes with a particular financial burden for shoppers，someone took a stand against plastic pollution. Reusable Tote Bags All Should Try This Year 1. Heavy Canvas Shopping Bag for Solo Shopping This heavy canvas shopping bag is large enough to hold the one-week worth of groceries, toiletries, and some New York spring flowers with no effort. Enjoy the full side and bottom gusset that gives your bag shape and support at all times. The side pocket allows you to store your keys, phone, or other accessories safely and with easy access. While the solid canvas natural nuance matches any outfit you can think of, the colored trims offer an elegant, simple, yet stylish look. 2. Foldable Cotton Tote with Pouch for Spur-of-the-Moment Shopping Do you know those days when you have no intention to go shoppin
Read more

Washing methods of various functional fabrics

Nowadays, clothes are getting more and more beautiful, and there are more and more types of functional fabrics, but the wrong cleaning method can easily make the clothes fade and deform! Don't wait for a good piece of clothing to be ruined and regret it. Xinbimei Textile will give you some cleaning techniques to extend the service life of the clothes! silk clothes Although silk clothes are comfortable to wear and look noble, they are easy to jump and need to be handled carefully. Washing: Use neutral soap flakes, neutral detergent or special silk detergent. First dissolve the detergent in warm water, soak the silk clothing for 5 minutes after cooling, rub it with your hands, and rinse with water. When washing bright-colored silk clothes, put a little white vinegar to fix the color. After washing, it should not be exposed to the sun, and should be hung in a ventilated place to dry. When drying in the shade, the fabric should be unfolded without overlapping. Ironing: If ironing is re
Read more