What is the heat limit of this cloth. I am thinking of making a insulating cover that can withstand heat up to 400c

Hi, there is nothing on the packaging to give heat limit other than 'Reflects hot or cold energy to its source' and 'not intended for microwave use'. More text on the packaging lists project example for which you can use 'Insul-Bright' like pot holders, oven mitts and casserole covers... if you want to be sure you can look on the website of the manufacturer which is www.warmcompany.com . Hope this helps!

I'm planning on getting this to attach to my motorcycle soft panniers to protect them against the exhaust silencer burning them, does it need covering

I used this for lining oven gloves that I made so I'm unsure whether this is what you need for outdoor use on a motorbike. Sorry.

Would this keep food cold or warm if used as a lining for a lunch bag?

It works to insulate the contents, so, if you put hot food into the lunch bag I would expect the insulated lining to keep the contents warm. If the food was cold and with an ice pack I would expect it to keep cold. I hope that answers you question. A good tip for a cool lunch bag is to freeze a small carton of juice which then acts as an ice pack without taking up any extra room. It has usually melted by mid day.

Could I used this to cover up an air vent to prevent drafts coming in?

No it is meant for sewing projects like oven gloves or cool bags

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Warm Company 36 x 45-inch Insul-Bright Insulated Lining

Warm Company 36 x 45-inch Insul-Bright Insulated Lining

Product ID: 48589255

Details

Material
Cotton
Brand
Warm Company
Item thickness
0.25 Inches
Recommended uses for product
home
Product dimensions
114.3L x 91.4W

🔥Reflective metalized poly film for radiant heat resistance

🧵36x45 inch versatile size

♻️Machine washable & durable needle-punched polyester

Description

🧶 Insulate your creativity—because your projects deserve the best!

CRAFT WITH CONFIDENCE - Needle-punched hollow polyester fibers ensure breathable, long-lasting insulation that won’t break down after washing.
SEW SMART GIFT SMARTER - Loved by both new and experienced sewers for creating practical, stylish home essentials and thoughtful handmade gifts.
MADE IN THE USA WITH QUALITY - Proudly crafted to meet high standards, combining durability and performance for your creative lifestyle.
PERFECT FIT FOR EVERY PROJECT - Generous 36 x 45-inch size ideal for pot holders, oven mitts, lunch bags, and more—turn everyday items into functional art.
REFLECT THE HEAT NOT THE STRESS - Innovative reflective metalized poly film bounces radiant energy back to its source, keeping your projects safer and more effective.

Warm Company’s Insul-Bright is a 36x45-inch needle-punched insulated lining made from hollow polyester fibers and a reflective metalized poly film. Designed for home sewers and crafters, it offers breathable, washable, and durable heat-resistant insulation perfect for practical sewing projects like pot holders and oven mitts. Made in the USA, it reflects radiant heat back to its source, enhancing safety and functionality in your handmade creations.

Specifications

ASIN	B000YZ7CQG
Best Sellers Rank	741,890 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 72 in Sewing Baskets
Brand	The Warm Company
Colour	Original Version
Customer Reviews	4.6 4.6 out of 5 stars (3,253)
Date First Available	10 Nov. 2010
Guaranteed software updates until	unknown
Item Weight	181 g
Material	Cotton
Model Number	6345
Product Dimensions	33.02 x 21.59 x 7.62 cm; 181.44 g

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