1. Technical Specifications of Glass Cloth Tape
According to the QC-8618 Technical Data Sheet (TDS), the product consists of a fiberglass cloth backing and silicone adhesive. Its total thickness is 0.18 mm. Each component plays an important role in the overall performance of the tape.
The main technical specifications are as follows:
Total Thickness: 0.18 mm
Thickness is an important consideration in electrical insulation design. It affects the space required for wrapping and the overall thickness of the insulation structure. A suitable thickness helps manufacturers balance insulation requirements and installation convenience.
180° Peel Adhesion: 7 N/25 mm
This value indicates the bonding strength between the tape and the applied surface. Good adhesion helps the tape remain securely attached during installation and use, particularly when it is used to wrap or secure electrical components.
Dielectric Breakdown Voltage: ≤3 kV
This parameter relates to the electrical breakdown performance of the material under specified test conditions. It should be evaluated together with the testing standard, sample thickness, test method and actual laboratory report. It should not be used alone to determine the insulation rating of the product.
Holding Power: ≥24 Hours
Holding power measures the tape's ability to resist movement under continuous shear stress. It is an important reference for applications where the tape needs to maintain its position over time.
Elongation: 3%
The relatively low elongation indicates limited stretching, helping the fiberglass backing maintain dimensional stability during application.
Temperature Resistance: 200°C
According to the TDS, QC-8618 has a temperature resistance rating of 200°C. This indicates good heat resistance, but long-term operating performance should be verified through thermal aging tests and practical application evaluation.
The fiberglass cloth provides mechanical support and an insulation backing, while the silicone adhesive offers bonding performance and heat resistance. Therefore, selecting glass cloth tape requires consideration of electrical properties, adhesion, mechanical strength and long-term thermal stability rather than temperature resistance alone.
2. Applications in Transformer Insulation
Transformers operate under electrical and thermal stress. Internal components such as windings, leads, connection points and other electrical parts require appropriate insulation and mechanical protection to ensure reliable operation.
Glass cloth tape can be used for wrapping, securing and protecting certain high-temperature components in transformers. Its fiberglass backing provides mechanical strength, while the silicone adhesive helps the tape bond to suitable surfaces. These properties make it a useful material for certain insulation and fixing applications.
For Class H (180°C) transformer insulation systems, material selection requires particular attention. Although QC-8618 has a stated temperature resistance of 200°C, this figure alone does not confirm that the product is suitable for continuous long-term use in a Class H transformer.
Long-term thermal stability, adhesion retention after heat aging, electrical performance and compatibility with other insulation materials must also be evaluated. Thermal aging tests and practical application validation are recommended before the product is approved for a specific transformer insulation system.
3. Factory Price Range
The price of glass cloth tape depends on several factors, including fiberglass cloth quality, adhesive type, thickness, width, roll length, coating process and order quantity.
For 0.18 mm thick glass cloth tape, the current factory reference price is approximately RMB 28–30 per square meter.
This is an indicative factory price rather than a fixed market price. The final quotation may vary depending on the required specifications, purchase volume, packaging requirements and delivery terms. For international orders, buyers should also confirm the applicable trade terms, such as EXW or FOB, to understand the total purchasing cost.
4. Frequently Asked Questions
Q1: Is the dielectric breakdown voltage of ≤3 kV stated in the TDS correct?
According to the current QC-8618 TDS, the dielectric breakdown voltage is stated as ≤3 kV. This is the value provided in the product specification. Customers are advised to verify it against the original test report, including the testing standard, sample condition and actual test results. For transformer applications, complete electrical performance data should be reviewed before final product selection.
Q2: Can the tape be used long-term in Class H (180°C) transformers if its temperature resistance is 200°C?
A temperature resistance rating of 200°C does not automatically guarantee continuous long-term performance at 180°C. Short-term heat resistance and long-term thermal aging performance are different considerations. Suitability for Class H insulation systems should be confirmed through thermal aging tests, post-aging adhesion evaluation and electrical performance testing.
Q3: Is the product adhesive-coated? Is the adhesive silicone-based?
Yes. QC-8618 is an adhesive-coated glass cloth tape. According to its TDS, the backing material is fiberglass cloth and the adhesive is silicone-based. Silicone adhesive generally offers good heat resistance and bonding performance, making it suitable for certain high-temperature insulation applications.
5. Conclusion
Glass cloth tape combines mechanical strength, electrical insulation and heat resistance, making it a useful material in electrical equipment and transformer insulation applications. When selecting a suitable product, manufacturers should carefully evaluate its thickness, dielectric breakdown voltage, adhesive type and long-term thermal performance.
Reviewing the TDS and relevant test reports, together with practical application testing, helps ensure that the selected tape meets the actual requirements of the intended transformer insulation system.