FF77 vs FF78F1 vs FF79F2: which Flex-Foam do I need?

They are the same 400 gsm tricot-covered foam; the difference is the adhesive. FF77 has none and is sewn or basted in. FF78F1 is fusible on one side, so it irons to the back of your outer fabric and the lining goes on loose. FF79F2 is fusible on both sides and bonds outer fabric and lining into one panel. Most bag makers use one-sided; two-sided is for fully fused panels; sew-in is for heat-sensitive fabric or when you want to quilt the layers anyway.

Flex-Foam vs ByAnnie Soft and Stable?

Both are tricot-faced foam stabilizers that give bags soft, padded structure and quilt beautifully. Soft and Stable comes as sew-in sheets (18" x 58" and larger). Flex-Foam comes on a 20" x 10-yard bolt and in sew-in, one-sided and two-sided fusible versions, so you can skip basting. If your pattern calls for Soft and Stable, Flex-Foam FF77 is the direct equivalent and FF78F1 is the same thing with an iron-on side.

Which side is the fusible side, and how do I fuse it?

One face carries the adhesive; it feels slightly tacky or textured compared with the plain tricot side. Lay that side against the wrong side of your outer fabric, cover with a press cloth and press from the fabric side with firm pressure, moving the iron in sections and letting each section cool before handling. Never put a hot iron directly on the foam. Test on a scrap first.

One-sided fusible vs In-R-Form single-sided fusible?

Both are one-sided fusible tricot-covered foams and work the same way in a bag. In-R-Form comes as 18" x 58" and 36" x 58" sheets in off-white or black; Flex-Foam comes on a 20" x 10-yard bolt, which is the cheaper way to buy foam if you make bags regularly.

Is a 20" width enough for a bag?

For most. Bag panels are usually under 20" in one direction and you cut the other dimension along the 10-yard length, so a bolt yields many bags. If you need a piece wider than 20", such as a large duffle or box lid, piece two cuts with a zigzag or use the 60" Uncovered Flex-Foam roll.

How does it sew on a home machine?

Well. The tricot facing keeps the foam from grabbing the presser foot. Use a walking foot, a 90/14 needle and a slightly longer stitch, and trim foam from seam allowances at bulky corners. Quilting lines every 2" to 3" give a bag the look of a professionally made piece.

Can I use Flex-Foam in a bowl cozy or hot pad?

No. Polyurethane foam is not microwave safe and does not insulate against heat. For microwave projects use Pellon Wrap-N-Zap cotton batting with all-cotton fabric and thread.

Pellon FF78F1 One-Sided Fusible Flex-Foam Stabilizer 20" x 10 yards Bolt

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Pellon® FF78F1 One-Sided Fusible Flex-Foam Stabilizer 20" x 10 yards Bolt.

Name: Pellon® FF78F1 One-Sided Fusible Flex-Foam Stabilizer 20" x 10 yards Bolt.
Brand: Pellon
SKU: PDS-DSFF78F1-2010
Price: 85.24 USD
Availability: InStock

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SKU: PDS-DSFF78F1-2010

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$85.24 $154.99

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Shipping & Fulfillment Details

Sold by: Linda’s Electric Quilters
Shipped by: Pellon

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Processing time is 1-3 business days.

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Pellon FF78F1 One-Sided Fusible Flex-Foam is the Flex-Foam most of our bag makers buy. It is a lightweight, easy-to-handle foam stabilizer with polyester tricot facing on both sides and fusible adhesive on one, sold on a 20" x 10-yard bolt. Fuse it to the wrong side of your outer fabric and the two behave as one layer through cutting, quilting and assembly, so there is no basting and no shifting.

The result is a bag that stands up on its own with soft, padded structure and a professional finish, and the foam recovers its shape after it is squashed. If you want both outer fabric and lining bonded, use FF79F2 two-sided fusible; for heat-sensitive fabrics use FF77 sew-in.

Specifications

Type	Foam stabilizer, tricot-covered, one-sided fusible
Fiber content	100% Polyurethane foam core with 100% Polyester tricot facing
Weight	400 gsm
Fusible	Yes, one side
Width x length	20" x 10 yards (bolt)
Color	Natural
Best for	Bags, totes, purses, baskets, boxes and any project that needs stable, lasting body with a professional finish
Also available as	FF77 sew-in · FF79F2 two-sided fusible · 2.25" one-sided fusible strip · FF76 uncovered 20" bolt
SKU	PDS-DSFF78F1-2010 (Pellon FF78F1)

FF77 vs FF78F1 vs FF79F2: which Flex-Foam do I need?: They are the same 400 gsm tricot-covered foam; the difference is the adhesive. FF77 has none and is sewn or basted in. FF78F1 is fusible on one side, so it irons to the back of your outer fabric and the lining goes on loose. FF79F2 is fusible on both sides and bonds outer fabric and lining into one panel. Most bag makers use one-sided; two-sided is for fully fused panels; sew-in is for heat-sensitive fabric or when you want to quilt the layers anyway.
Flex-Foam vs ByAnnie Soft and Stable?: Both are tricot-faced foam stabilizers that give bags soft, padded structure and quilt beautifully. Soft and Stable comes as sew-in sheets (18" x 58" and larger). Flex-Foam comes on a 20" x 10-yard bolt and in sew-in, one-sided and two-sided fusible versions, so you can skip basting. If your pattern calls for Soft and Stable, Flex-Foam FF77 is the direct equivalent and FF78F1 is the same thing with an iron-on side. ByAnnie Soft and Stable 36" x 58", white
Which side is the fusible side, and how do I fuse it?: One face carries the adhesive; it feels slightly tacky or textured compared with the plain tricot side. Lay that side against the wrong side of your outer fabric, cover with a press cloth and press from the fabric side with firm pressure, moving the iron in sections and letting each section cool before handling. Never put a hot iron directly on the foam. Test on a scrap first.
One-sided fusible vs In-R-Form single-sided fusible?: Both are one-sided fusible tricot-covered foams and work the same way in a bag. In-R-Form comes as 18" x 58" and 36" x 58" sheets in off-white or black; Flex-Foam comes on a 20" x 10-yard bolt, which is the cheaper way to buy foam if you make bags regularly. In-R-Form single-sided fusible 58" x 36", off-white
Is a 20" width enough for a bag?: For most. Bag panels are usually under 20" in one direction and you cut the other dimension along the 10-yard length, so a bolt yields many bags. If you need a piece wider than 20", such as a large duffle or box lid, piece two cuts with a zigzag or use the 60" Uncovered Flex-Foam roll. Pellon FF76 Uncovered Flex-Foam 60" x 10 yd roll
How does it sew on a home machine?: Well. The tricot facing keeps the foam from grabbing the presser foot. Use a walking foot, a 90/14 needle and a slightly longer stitch, and trim foam from seam allowances at bulky corners. Quilting lines every 2" to 3" give a bag the look of a professionally made piece.
Can I use Flex-Foam in a bowl cozy or hot pad?: No. Polyurethane foam is not microwave safe and does not insulate against heat. For microwave projects use Pellon Wrap-N-Zap cotton batting with all-cotton fabric and thread. Pellon Wrap-N-Zap 45" x 1 yd package