Understanding the Dimensions (6 mm x 6 mm)

The dimensions dictate exactly which window profile tracking systems this model will fit:

• 6mm Base Width: This is the width of the rigid, flat plastic (polypropylene) backing plate. While standard residential uPVC profiles often use a narrower 4.8 mm base, heavy-duty commercial series, multi-track sliding systems, and specialized aluminum/uPVC hybrid systems feature a wider groove engineered specifically for a $6\text{ mm}$ base plate.

• 6mm Pile Height: This is the vertical length of the soft yarn brush fibers. A 6 mm height is ideal for sealing air gaps measuring between 4 mm x 5mm. It provides a tight, compressed seal when the window is latched without creating excessive friction that makes the window hard to slide open.

Premium Performance Variations

When purchasing a 6 mm x 6 mm woolpile spool, ensure you select the correct type based on your environmental needs:

• Siliconized Weather Stripping (Waterproof): The brush fibers are treated with a silicone coating. This ensures the yarn completely repels water rather than soaking it up like a sponge, preventing mold growth and protecting the internal tracking from water logs during heavy rain.

• Fin-Seal Woolpile (Heavy Wind Resistance): Features a solid, flexible PVC plastic fin built right down the center of the brush fibers. While the brush stops dust and dampens sound, the central fin acts as a total physical block against driving wind and drafts—essential for high-rise apartment windows.