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.

How do I fuse a two-sided foam without gluing it to my ironing board?

Build the sandwich before you press: outer fabric wrong side down on the foam, lining wrong side down on the other face, then press from one side through a press cloth, flip and press the other. Keep a Teflon or silicone sheet under the work so stray adhesive does not reach the board, and let the panel cool flat.

Two-sided Flex-Foam vs Bosal In-R-Form Plus double-sided fusible?

Both are double-sided fusible tricot-covered foams and are interchangeable in most bag and basket patterns. In-R-Form Plus comes as 18", 36" and 54" x 58" sheets; Flex-Foam FF79F2 comes on a 20" x 10-yard bolt, which is the lower cost per project if you make these 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® FF79F2 Two-Sided Fusible Flex-Foam Stabilizer 20" x 10 yards Bolt.

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Pellon® FF79F2 Two-Sided Fusible Flex-Foam Stabilizer 20" x 10 yards Bolt.

Name: Pellon® FF79F2 Two-Sided Fusible Flex-Foam Stabilizer 20" x 10 yards Bolt.
Brand: Pellon
SKU: PDS-DSFF79F2-2010
Price: 89.64 USD
Availability: InStock

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SKU: PDS-DSFF79F2-2010

Price:

$89.64 $162.99

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In stock

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

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Pellon FF79F2 Two-Sided Fusible Flex-Foam is the Flex-Foam with adhesive on both faces. It is a lightweight, easy-to-handle foam stabilizer with polyester tricot facing on both sides, sold on a 20" x 10-yard bolt. Fuse your outer fabric to one side and your lining to the other and the three layers become a single firm panel with stability and lasting body, ready to quilt or sew.

That makes it the choice for fully fused bag bodies, placemats, fabric boxes, bowls and anywhere you want both fabrics locked to the foam without basting. If you only need the outer fabric bonded, FF78F1 one-sided is the usual pick; for heat-sensitive fabrics use FF77 sew-in.

Specifications

Type	Foam stabilizer, tricot-covered, two-sided fusible
Fiber content	100% Polyurethane foam core with 100% Polyester tricot facing
Weight	400 gsm
Fusible	Yes, both sides
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	FF78F1 one-sided fusible · FF77 sew-in · FF76 uncovered 20" bolt · FF76 uncovered 60" roll
SKU	PDS-DSFF79F2-2010 (Pellon FF79F2)

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
How do I fuse a two-sided foam without gluing it to my ironing board?: Build the sandwich before you press: outer fabric wrong side down on the foam, lining wrong side down on the other face, then press from one side through a press cloth, flip and press the other. Keep a Teflon or silicone sheet under the work so stray adhesive does not reach the board, and let the panel cool flat.
Two-sided Flex-Foam vs Bosal In-R-Form Plus double-sided fusible?: Both are double-sided fusible tricot-covered foams and are interchangeable in most bag and basket patterns. In-R-Form Plus comes as 18", 36" and 54" x 58" sheets; Flex-Foam FF79F2 comes on a 20" x 10-yard bolt, which is the lower cost per project if you make these regularly. In-R-Form Plus double-sided fusible 36" x 58"
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