What is the R value of the 1.18"?

This is a good question that unfortunately I cannot readily answer looking at the description of the item which states: Good thermal insulation Rubber insulation pipe adopts closed cell structure, low thermal conductivity, stable temperature, and has the function of thermal insulation.....if we take the verbiage they elect to use indicates it "adopts" closed cell structure. Really !? it adopts ? So is it or isn't it ? It goes on to say it "has the function of thermal insulation", well I would think so !! Proclaiming it has the function as opposed to stating that it has the function....perhaps something is getting lost in translation... If I take what they say literally, i.e. that the material is in fact "closed cell rubber" then the following would apply to your question: This is closed-cell foam rubber, on the other hand, becomes rigid upon application and has an R-value range of 6 to 7.

Can this be used on underground sewage lines?

I suppose it depends how far underground and what kind of material (rocks / aggregate / sand etc.) it would be exposed to, it would eventually break down over time and or get crushed from the weight / force around it... it's not designed to be buried under ground , if you do, you do so at your own risk...

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🛠️ Wrap it right, save energy tight!

SIZE PERFECT FIT - Comprehensive size range ensures a snug fit for diverse pipe diameters, maximizing insulation performance.
ALL WEATHER ARMOR - Industrial-grade flame retardant and waterproof design protects pipes from snow, rain, wind, and heat.
VERSATILE PROTECTION - Perfect for insulating water pipes, hoses, and even fitness equipment handles for everyday durability.
EFFORTLESS INSTALLATION - No extra layers needed—just cut, glue, and secure for a hassle-free setup.
ULTIMATE THERMAL SHIELD - Closed-cell foam structure locks in temperature, reducing energy loss and boosting efficiency.

This 0.79" thick, closed-cell foam pipe insulation tubing with a 3-1/2" inner diameter offers superior thermal insulation and weather resistance. Engineered for easy cut-and-glue installation, it provides flame retardant, waterproof protection ideal for residential and commercial pipe lagging, ensuring energy efficiency and durability across diverse applications.

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Manufacturer	SYSMG
Part Number	SYSMG
Item Weight	3.53 ounces
Product Dimensions	1 x 1 x 0.1 inches
Item model number	SYSMG
Size	ID 3-1/2"
Color	0.79"
Item Package Quantity	1
Number Of Pieces	1
Included Components	NO

Water Pipe Insulation Tubing 3/4" 1" 1-1/4" 1-1/2" 2" 2-1/2" 3" 3-1/2" 4" Inner Diameter Foam Tube Insulation for 0.79"/1.18" Thick Wall Insulation Lagging Wrap (0.79", ID 3-1/2")

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