Detailed Methodology for Chemical Resistance Testing of Synthetic PP Thermal Paper
In today’s realm of printing materials, synthetic PP thermal paper is gradually capturing attention due to its unique properties and extensive applications. This article delves into the characteristics, manufacturing principles, and the rationale behind testing the chemical resistance of synthetic PP thermal paper.

I. What is Synthetic PP Thermal Paper?

Synthetic PP thermal paper is a paperless thermal recording material made by coating a thermal color-developing layer onto a polypropylene (PP) film substrate. Compared with ordinary thermal paper, it has several significant advantages. Ordinary thermal paper is made by coating micro-powders on regular paper, with components such as colorless dyes, phenols, or other acidic substances separated by a film. In contrast, synthetic PP thermal paper leverages the excellent properties of PP film, such as light resistance, moisture resistance, and corrosion resistance, to maintain stable performance in complex environments.

II. Features of Synthetic PP Thermal Paper

•  High strength and toughness
•  Excellent water and moisture resistance
•  Resistance to high and low temperatures (typically -40℃ to +100℃)
•  Good chemical stability
•  Among these, 75μm (i.e., 0.075 millimeters) is one of the most common thickness specifications in industrial applications, balancing flexibility and mechanical strength.

III. Why Test Chemical Resistance?

Thermal paper may come into contact with chemicals in the following scenarios:
•  Medical environments: Exposure to disinfecting alcohol, iodine tincture, saline solution, etc.
•  Logistics and warehousing: Contact with cleaning agents, rust preventive oil, packaging glue
•  Industrial manufacturing: Interaction with lubricating oils, cooling liquids, weak acid and weak base cleaning agents
•  Retail labeling: Contact with food oils, hand sweat, cosmetics
If the thermal coating or substrate is chemically corroded, it may lead to image fading, blurring, bubbling, peeling, or discoloration, directly affecting the readability of information and product compliance.

IV. Application Fields

The application scope of synthetic PP thermal paper is very extensive, covering several important industries:
•  Retail and logistics: In these sectors, synthetic PP thermal paper is commonly used for label printing, such as barcodes and QR codes. Its efficient printing performance and wear resistance ensure that labels remain clear after long-term use.
•  Medical industry: In the medical field, synthetic PP thermal paper is used for drug labels, medical records, and medical device identification. It can withstand disinfection and high temperatures, reducing the risk of medical errors caused by label damage.
•  Food packaging: Clear ingredient labels and expiration dates on food packaging are crucial for consumers. Synthetic PP thermal paper, with its environmentally friendly and corrosion-resistant properties, has become an ideal choice for food packaging.
•  Home appliance industry: In this industry, synthetic PP thermal paper is used for control panels and display screens, providing good tactile and visual effects while being wear-resistant and extending the product’s service life.

In summary, synthetic PP thermal paper plays an important role in many fields due to its excellent chemical resistance. Through rigorous chemical resistance testing, its stability and reliability in various complex environments can be ensured, meeting the needs of different industries.