6440(DMD-P) prepreg material

It is suitable for use as interlayer insulation and end‑turn insulation in low‑voltage windings of Class F dry‑type transformers and reactors, as turn‑to‑turn insulation, slot‑to‑slot insulation, and liner insulation in Class F motors, and can also be wound into laminated tubes or molded into other custom‑shaped insulating components.

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Product Description:

6440(DMD-P) prepreg material It is a prepreg material formed by laminating a polyester film coated on both sides with a high‑temperature‑resistant resin to a polyester fiber nonwoven fabric, followed by impregnation with B‑stage high‑temperature‑resistant resin and partial curing through heat baking.

6440(DMD-P) prepreg material It exhibits excellent heat resistance, superior dielectric properties, and robust mechanical performance, with easy impregnation and strong adhesion. It is rated for Class F thermal endurance and complies with the EU RoHS environmental standards.

6440(DMD-P) prepreg material It is suitable for use as interlayer insulation and end‑turn insulation in low‑voltage windings of Class F dry‑type transformers and reactors, as turn‑to‑turn insulation, slot‑to‑slot insulation, and liner insulation in Class F motors, and can also be wound into laminated tubes or molded into other custom‑shaped insulating components.

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Technical Requirements for 6440 (DMD-P) Prepreg Material

Serial number	Indicator Name		Unit	Indicator value
1	Nominal thickness		mm	0.15	0.18	0.20	0.25	0.30	0.40
2	6630 (DMD) substrate structure		thousand	1.5-2-1.5	2-2-2	2-3-2	2-5-2	2-6-2	2-10-2
3	Thickness tolerance		mm	±0.020	±0.020	±0.020	±0.025	±0.030	±0.040
4	Quantitative (reference value)		g/m ²	165±30	180±30	210±30	270±30	320±35	450±40
5	Tensile strength	No longitudinal bending	N/mm	≥70		≥80		≥100
6	Soluble resin content		g/m ²	≥45
7	Volatile content		%	≤1.5
8	Breakdown voltage		Kv	≥7		≥8		≥10
9	Tensile shear strength		Mpa	≥3.0
10	Long-term hot-state temperature index		°C	≥155

Note: 1. For products with special thickness specifications, the technical specifications and specific requirements may be determined through mutual agreement.

　　2. If the customer has specific requirements regarding the product structure, such requirements shall be followed.

　　3. Recommended curing conditions: 100°C for 8–10 hours, 130°C for 6 hours, and 150°C for 5 hours.

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