Definition
Fusible describes any sewing material coated on one side with heat-activated glue, such as interfacing, hemming web or stay tape, which bonds to fabric when pressed with an iron.
Fusible products save time and give consistent results. The main ones:
- Fusible interfacing, the most common, adds structure to collars, facings, waistbands and plackets (see interfacing).
- Fusible web, double-sided and sold in sheets or narrow tapes, glues two fabrics together: used for appliqué, quick hems and repairs.
- Fusible stay tape, a narrow strip that stops edges stretching, on shoulder seams, necklines and zip openings in knits.
- Fusible fleece and foam, for padded bags, pouches and placemats.
How to fuse well:
- Find the glue side: slightly shiny, rough or dotted.
- Place it against the wrong side of the fabric, cover with a pressing cloth, and set the iron to the temperature the product requires, usually between wool and cotton.
- Press without sliding, with firm pressure and usually steam, for about 10 to 15 seconds per spot, overlapping as you go.
- Let it cool completely before moving the piece, since the bond sets as the glue cools.
If fused interfacing bubbles after washing, the heat, pressure or time was too low, or the fabric shrank: prewash the fabric first. Some synthetics, velvets and sequined or heat-sensitive fabrics need sew-in interfacing instead. More under pressing.