Yellowing resistance class of TPU tape

Yellowing resistance is one of the important factors that garment accessory purchasers would consider. After all, the clothes must be exposed under the sunlight. If one shirt get yellowing soon, the owner would like to change to a new one. Of course, no one like low quality goods. So when purchasers from famous clothes brands buy TPU tape, yellowing resistance class will be a reference.

Generally, the low quality TPU tape will get yellowing in one year while the high quality TPU tape will get yellowing in three years. Suppliers would offer the yellowing resistance class data. For example, B Series clear tape is in grade 2-3 while D Series and S Series tape is in grade 4-5. How to verify the data from suppliers? If some are interested in, he can collect some pieces of mobilon tape to expose under the sunlight. When times going, he will see the change. But it is impossible absolutely to use such a method if purchasers would like to assess yellowing resistance class.

Actually, yellowing resistance has standard assessment. Yellowing resistance is that one accessory get yellowing slow or don’t get yellowing under sunlight or other circumstances in a period of time. Purchasers can use gray scale to assess yellowing resistance class of TPU tape. Firstly, test TPU tape sample by Suntest, QUV or other yellowing resistance test. Then compare the color of tested sample and gray scale to access the yellowing resistance class.

There are 5 classes on gray scale. The TPU tape in grade 5 nearly won’t get yellowing even suffer long time UV test. This kind of TPU tape is made from aliphatic series TPU raw material. The mobilon tape in grade 4-5 will get yellowing slightly. Yellowing resistance in this class can meet requirement of the most purchasers. And that lower than grade 3 will get yellowing more easily.