Established in 1997, Histrong focuses on vinyl decorative building materials. Our PVC soffit panels are tailor-made for sunrooms and panoramic window residences with abundant natural light, offering V Slot, U Slot, multi-column profiles and complete supporting accessories. Made of high-density co-extruded PVC with density of 1.35g/cm³ and thermal expansion coefficient as low as 4.2×10⁻⁵/℃, the panels resist warping and discoloration under long-term sunlight and temperature changes. They meet B1 fire rating, show color difference ΔE＜2 after 1250h UV aging test, with water absorption ≤13% to avoid mildew in humid conditions, and cut external noise by 26%-31% via sound absorption. Certified by IAF, CNAS, RoHS and CE, we provide B2B bulk procurement and ODM/OEM customization for patterns & profiles. With natural wood texture, easy installation and low maintenance, they are highly durable for ceilings and interior/exterior walls of well-lit houses.