Lesson 1
If a man therefore purge himself from these, he shall be a vessel unto honour, sanctified, and meet for the master's use, and prepared unto every good work.
2 Timothy 2:21
What Actually Stops the Heat: Choosing Batting for the Kitchen
A potholder is one of the few things you will sew that can hurt someone if you build it wrong. That is not a reason to be nervous about it. It is a reason to understand, before you cut anything, which part of the stack is actually doing the work.
Paul writes of a vessel "meet for the master's use, and prepared unto every good work." A kitchen textile is exactly that kind of vessel: a plain object whose whole worth is whether it holds up under real use. Pretty is welcome. Fit for use comes first.
The outer fabric is not the insulation
Beginners often go looking for a special heat-proof cloth and are surprised to learn there is no such thing on the quilting-cotton shelf. Ordinary good-quality woven cotton is the right outer fabric for potholders, mitts, and pads. What protects your hand is the middle of the sandwich, not the face of it.
Choose a firm, tightly woven cotton with a little body — quilting cotton, cotton duck, or a heavy cotton-linen blend. Avoid loose weaves that will fray at the binding, and avoid anything with a synthetic content you cannot identify. A poly-blend outer fabric sitting against a hot pan can scorch or glaze where a cotton would only mark.
Natural fiber loft batting, and nothing else
Here is the rule that governs the bulk of the stack. Loft batting — the ordinary fluffy kind sold off the bolt for quilts — must be 100 percent natural fiber, cotton or wool, for anything that touches a hot pan. Polyester quilt batting is made to loft and insulate a bed, and under kitchen heat it can soften, melt, and fuse. Melted synthetic sticks to skin, and a burn from it is far worse than the burn you were trying to prevent. Read the label on the bolt end or the package. If it says polyester, or "poly blend," or you cannot tell, set it aside for a quilt and buy cotton.
The same caution belongs on scrap batting from a friend's bin. Unlabeled loft is not worth the risk on a mitt. Cotton batting is inexpensive, widely stocked, and quilts down flat, which is exactly the behavior you want here.
Insul-Bright and how to stack it
Insul-Bright is a heat-reflective batting made for this purpose: a needled fiber layer carrying a reflective metallized film that turns radiant heat back rather than passing it through. It is the one engineered exception to the rule above. Its fiber and its film are both synthetic, but they are manufactured for this job and behave nothing like the loose synthetic quilt loft that melts. The rule governs the loft layers; Insul-Bright is not one of them. For a flat potholder it is adequate on its own. For anything you will grip — a mitt, a handle cover, a pad you lift a Dutch oven with — sandwich the Insul-Bright between two layers of cotton batting. The cotton gives you thickness and dead air; the reflective layer handles radiant heat. Together they outperform either one alone.
A dependable potholder stack, from the outside in, is: cotton face, cotton batting, Insul-Bright, cotton batting, cotton back. That is five layers at the seam allowance and it drives everything that follows in this unit — needle size, stitch length, presser foot pressure, and how you bind the edge.
I am not going to give you a temperature rating for Insul-Bright, because the manufacturer's own published claims are about reflection rather than a stated limit, and a number I cannot verify is worse than no number. Treat every potholder as something that slows heat, not something that stops it. Set the pan down; do not stand holding it.
Test it before your family uses it
Wet fabric conducts heat fast, so a damp potholder is not a potholder. Keep a dry one at hand and hang the wet one to dry.
When a new potholder comes off the machine, test it yourself. Heat the oven, take out a hot pan, and pay attention to how many seconds pass before you feel warmth coming through. If heat arrives almost at once, the stack is too thin or the batting is wrong. Add a layer of cotton batting and rebuild. Do this test on your own hand before you hand the finished piece to a child or a guest, and before you give it away.
Buying for a first batch
For four 8-inch potholders you will need about a half yard of cotton for the faces and backs together, a quarter yard of Insul-Bright, and a half yard of cotton batting. Buy a little extra of each. Off-cuts of cotton batting become the practice sandwiches you will use in the next several sessions, and you will want them.
Check yourself
Which layer of a potholder actually provides the heat protection?
- The outer fabric, if it is heavy enough
- The batting in the middle
- The thread used at the seams
- The bias binding at the edge
Answer
B. The batting in the middle
Which fiber content is required for the loft batting layers in a potholder?
- Polyester, for its loft
- 100 percent natural fiber, cotton or wool
- A polyester and cotton blend
- Any batting, as long as it is thick
Answer
B. 100 percent natural fiber, cotton or wool
Why is ordinary polyester quilt batting dangerous in a potholder?
- It absorbs water and steams
- It frays badly at the binding
- It can soften, melt, and fuse, and melted synthetic sticks to skin
- It shrinks more than cotton does
Answer
C. It can soften, melt, and fuse, and melted synthetic sticks to skin
How should Insul-Bright be used in an oven mitt you will grip?
- Alone, directly against the outer fabric
- Sandwiched between two layers of cotton batting
- Doubled, with no cotton batting at all
- On the outside, so the reflective side faces the pan
Answer
B. Sandwiched between two layers of cotton batting
What is the recommended potholder stack, from the outside in?
- Cotton face, Insul-Bright, cotton back
- Cotton face, polyester batting, cotton back
- Cotton face, two layers of Insul-Bright, cotton back
- Cotton face, cotton batting, Insul-Bright, cotton batting, cotton back
Answer
D. Cotton face, cotton batting, Insul-Bright, cotton batting, cotton back
The verse describes a vessel "meet for the master's use, and prepared unto every good work." How does that shape the way this unit approaches kitchen sewing?
- Fitness for real use comes before appearance
- Plain objects are not worth sewing carefully
- Only ornate work honors God
- Kitchen items should be saved and never used
Answer
A. Fitness for real use comes before appearance
Why should a damp potholder be set aside and dried?
- Wet fabric conducts heat quickly
- Wet cotton batting will melt
- The binding stitches loosen when wet
- Water dissolves the reflective layer
Answer
A. Wet fabric conducts heat quickly
What outer fabric is appropriate for potholders?
- Only fabric sold as heat-resistant
- A loose, open weave so it breathes
- A firm, tightly woven cotton such as quilting cotton or cotton duck
- A poly-blend sheeting
Answer
C. A firm, tightly woven cotton such as quilting cotton or cotton duck
How should a newly finished potholder be tested?
- Hand it to a family member and ask how it feels
- Hold it over a burner flame
- Wash it and check for shrinkage
- Use it yourself on a hot pan and notice how long before warmth comes through
Answer
D. Use it yourself on a hot pan and notice how long before warmth comes through
How many layers does that recommended stack put under the needle at the seam?
- Three
- Four
- Five
- Ten
Answer
C. Five