The solder mask layer, as the name suggests, is a layer that prevents welding. Generally green or other colors, the film covering the copper wire is used for insulation and to prevent solder from adhering to some copper wires that do not need to be soldered. It also protects the wiring layer to a certain extent. Solder resist requires a certain thickness and hardness, solvent resistance test and adhesion test to meet the standards, and the surface of printed circuit boards should be free of garbage and excess marks. 1.1 The types of solder resist involved in the 1.1 type are divided into: UV curing solder resist, thermal curing solder resist, liquid photosensitive solder resist, and dry film solder resist according to the processing characteristics of the process. Excluding peelable solder resist (ink). The 1.2 grade solder resist is divided into the following three grades for different usage requirements or instrument equipment selection. Level 1: High reliability product. The solder resist on the printed circuit board of this level has excellent performance and long service life. Its inspection and acceptance level is high, and its standards are mandatory. It is suitable for machines and equipment that work continuously and do not allow downtime. Level 2: For general industrial products, the solder resist on this level of printed boards has good performance and a longer lifespan, allowing for some surface defects, and not allowing shutdown is not a critical requirement. Suitable for general industrial instruments and equipment, such as computers, communication machines, advanced commercial and industrial machines, and general military equipment. Level 3: Consumer products. The surface defects of the solder resist on the printed circuit board of this level are not important, but there are requirements for the functionality of the entire circuit. These boards have low costs and can be subjected to limited inspection and testing on their processing graphics. They are suitable for television sets, electronic equipment for entertainment activities, toys, and non critical industrial control equipment, or other consumer goods
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China