Is this ridgid enough to use as crawl space door? I would screw it on about 2 inches from the out side edge.

Yes, I would say it is solid enough for a crawl space door. What I received was used for making large molds and the whole sheet was rigid. It may need a c-channel frame to keep its shape if it is exposed to heat/sunlight to prevent warping, but I am not 100% sure as to how much warping may occur if any with the HDPE. I hope this is helpfull.

What is the strength rating for this material, 1/2" vs 3/8" vs 1/4" ?

I don't know. Look for specs on the internet where the will be if available at all.

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Marine Board HDPE (High Density Polyethylene) Plastic Sheet 1/2" x 24" x 48” White Color Textured

Marine Board HDPE (High Density Polyethylene) Plastic Sheet 1/2" x 24" x 48” White Color Textured

Product ID: 113642816

Details

Brand
Polymersan
Color
White
Item dimensions L x W x H
48 x 24 x 0.5
Material
HDPE Sheet
Shape
Sheet/Plate

💧Ultra low water absorption

⚙️Easy to cut & weld

🛡️Impact resistant HDPE

฿23528

Duties & taxes included

In stock

Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Marine-grade strength meets sleek versatility — don’t get left behind!

EFFORTLESS FABRICATION - Smooth textured finish and easy weldability make cutting, sanding, and drilling a breeze.
SAFE SUSTAINABLE CHOICE - Non-toxic, FDA-compliant material ensures peace of mind for all your applications.
VERSATILE TEMPERATURE RANGE - Performs reliably from -58°F to +194°F, perfect for indoor and outdoor use.
WEATHERPROOF WATER RESISTANT - Virtually zero water absorption keeps your work pristine in any environment.
BUILT TO LAST BUILT FOR IMPACT - High-density polyethylene delivers superior tensile & compressive strength for demanding projects.

Marine Board HDPE is a 1/2" thick, 24" x 48" white textured plastic sheet made from high-density polyethylene. It offers exceptional impact resistance, low moisture absorption, and chemical resistance, making it ideal for marine, industrial, and outdoor applications. Easy to cut, sand, and weld, it operates across a wide temperature range (-58°F to +194°F) and meets FDA safety standards.

Specifications

ASIN	B07N8FJ883
Brand Name	Polymersan
Color	White
Customer Reviews	4.4 4.4 out of 5 stars (64)
Grade Rating	Commercial
Item Dimensions	48 x 24 x 0.5 inches
Item Form	Sheet
Item Shape	Sheet/Plate
Item Thickness	0.5 Inches
Item Weight	20 Pounds
Manufacturer	Polymersan
Material	HDPE Sheet
Number of Items	1
Part Number	HD-B
Specification Met	Fda

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