Are these sheets shiny on one side?

Not overly so. They have what I'll call a "semi-matte" finish to them. I use them to make gaskets for my homebrewed beer buckets. They are just the right softness/hardness to compress and make a good seal when you tighten-down the backnut of the transfer valve. They don't squirt out from behind the spigot when cut to 2" x 2" size. A one-inch arch punch cuts a nice hole in them that squeezes around the threaded portion "just right" to preclude any leaks. You get three 6" x 6" x 1/8" sheets from matniks, which will make 27 gaskets. You can also buy a black neoprene "fender washer" from Hillman that is 3" in diameter with a one-inch hole, which also puts a gentle squeeze on the transfer valve. If you're using these things to make homebrew, be sure to sterilize before your wort comes into contact with it...

Is the material really silicone rubber or just a compound that includes a gum rubber and silicon dioxide (silica particles)?

Looks like and feels like silicone rubber, although I've never handled a compound of gum rubber and silicon dioxide (silica particles).

Does the white color fade when exposed to sunlight?

Yes, it is normal to get some coloration when exposed to sunlight.

Can this be used for a gas cap seal?

We are no sure what do you mean with “gas”. Silicone rubber is not recommended to use with gasoline, fuel or oil products.

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MATNIKS Food Grade Silicone Rubber Sheet 6x6-inch by 1/16 White [3-pack] Duro Shore A65 High Temperature Heavy Duty for Gaskets DIY Food Covers Lids Sealing Material Supports Microwave Oven Protection

MATNIKS Food Grade Silicone Rubber Sheet 6x6-inch by 1/16 White [3-pack] Duro Shore A65 High Temperature Heavy Duty for Gaskets DIY Food Covers Lids Sealing Material Supports Microwave Oven Protection

Product ID: 119184743

📏3 sheets, 6x6 inches each

🔥Temp resistant -100ºF to 400ºF

✂️Easy DIY cutting

€ 35.37

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Seal the deal with silicone that works as hard as you do!

FOOD SAFE DURABLE - Certified food-grade silicone with high tensile strength and 400% elongation for lasting reliability.
MULTI PURPOSE MASTERY - Perfect for gaskets, seals, vibration dampening, insulation, and microwave-safe covers.
TRIPLE PACK PRECISION - Three perfectly sized 6x6-inch sheets for versatile projects and replacements.
DIY FRIENDLY FLEXIBILITY - Cut, shape, and customize effortlessly with scissors or knives—your creativity, no limits.
EXTREME TEMPERATURE TOUGHNESS - Withstands from freezing -100ºF to scorching 400ºF, ideal for kitchen and industrial use.

MATNIKS Food Grade Silicone Rubber Sheets come in a convenient 3-pack of 6x6-inch, 1/16-inch thick white sheets. Engineered with Duro Shore A65 hardness, these heavy-duty silicone sheets resist extreme temperatures from -100ºF to 400ºF, making them perfect for food-safe applications, DIY gasket creation, and protective sealing. Their high tensile strength and flexibility ensure durability and easy customization, supporting everything from kitchen covers to industrial insulation.

Specifications

ASIN	B07PVZQK28
Best Sellers Rank	#270,777 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #261 in Rubber Sheets, Rolls & Strips
Color	White
Customer Reviews	4.5 4.5 out of 5 stars (481)
Date First Available	February 14, 2019
Item Package Quantity	3
Item Weight	5.6 ounces
Manufacturer	MATNIKS Rubber
Number Of Pieces	3
Product Dimensions	6 x 6 x 0.06 inches
Size	White 1/16-inch Thick

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