I am going to make some table toppers and have some material that I will never use. I was wondering if it would be O.K. for a substitute for low-loft batting? Has anyone done so? Thanks...

I don't have a response for you - I have several I would like to make in the next weeks or so and interested in the responses as well. Thanks for asking,

I have heard of using prewash flannel but not fabric.

I've not done this, but I can't imagine why it wouldn't work. If in doubt, make a little test sandwich using this fabric as batting and see if you like the result.

Many people use sheets....fabric should be okay as long as it does not show thru the top.

I can't see why not...I also use flannel for my batting for table toppers.

I sew alot with donated/garage sale fabric, etc... I freq use low quality or ugly fabric as batting.. if it is VERY low quality I 2 layers in... rights sides togehter.. The trick is to make sure it does not show thru ur quilt top or backing...

I do prewash/preshrink everything.

DITTO....right down to the washing...

However you have to realize that whatever you make with like this will have NO body, and will not be good to use for hot pads/table runners where a hot item might sit on it.

exactly what do you mean by "material" that I will never use"
What kind of material is it.
Without knowing it is difficult to give informed suggestions.

sure you can!!!
you can use flannel, muslin, what ever you want- as long as it's not going to show through

I have table runners and table cloths with wonderful drape/weight/body that simply have a layer of muslin in them instead of batting- a few years ago i made my mom a table runner with a thin batting- she did not like it and asked for one with out batting- i used muslin instead- it turned out so much better= now that's how we do most of them- you can use what you want- i would just be careful of poly blends if anything hot will be put on them---like right off the stove pans