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How To Measure and Cut-To-Size Policy | Close it

Cut-To-Size Items are Non-Returnable!

As per our Shipping and Returns Policy, custom cuts and fabricated parts are non-returnable. If you need an over- or undersized item, note it under \"Comments\" during Checkout. Cut-to-size orders have an acceptable cut tolerance of 1/8" (0.125"), so clarify if the adjustment is to be made on the (+) or (-) side of the saw blade. Please review our full return and shipping policy here.

Measure Twice, Cut Once

Since custom cuts and fabricated parts are non-refundable, be very careful while measuring your dimensions. As each cut is nominal, even the slightest miscalculation could be costly.

How to Use a Measuring Tape

Extend your tape measure several inches to find the 1 and 2 inch markers. In between the inch markers you’ll find 16 equally spaced tick marks.

Measure by counting the increments beyond the nearest inch. As the increments decrease, so does the length of the mark. For example, 1/2\" has a bigger mark than 1/4\" which has a bigger mark than 1/8\". The smallest mark follows at 1/16\". Please be aware that some measuring tapes may have even smaller increments.

Features of a Measuring Tape: Sliding End Hook

The sliding end hook is designed for two different types of measurements. An outside measurement (where the hook of the tape hangs over an edge), requires the hook to slide out a bit to account for the thickness of the material. When making an inside measurement (where the hook will push up against a surface), the clip slides in, again, accounting for its thickness. The measuring tape self-adjusts to guarantee an accurate measurement (as far as the tape is concerned).

King Starboard<sup>®</sup> XL HDPE Sheet | White

King Starboard® XL HDPE Sheet | White

Marine-grade High Density Polyethylene


Price for .375" X 60" X 96" Qty: 1


* Prices are subject to change every 6 days
Login or Create an Account to Get As low as $67/month with


King StarBoard® XL is a lighter and more economical version of King StarBoard® with a closed-cellular inner core and many of its properties, including UV stability, great weatherability, and salt water and chemical resistance. King StarBoard® XL is up to 30% lighter than King StarBoard®. It is best used for high-visibility applications where structural strength and a finished edge are not critical.

Warm colors, rot resistance, UV inhibitors, and ease of fabrication make King Starboard® XL the material of choice for cabinetry. It can be machined and worked just like wood with woodworking tools.

King Starboard Specs, Grades & Applications -

  • Easy to fabricate and machine
  • Extremely durable
  • Unique (closed-cell) cellular marine-grade sheet
  • Weighs 30% less than traditional King Starboard
  • Resistant to rotting, swelling, splintering and delaminate
  • Environmentally stabilized for harsh sun and marine environments
  • Resistant to odor, acid, alcohol and bases
  • Easy to clean
  • Matte-textured finish on both sides

Product Reviews


Water Absorption: 0.10% @ 24H
Density: .77 g/cc
Tensile Strength: >3300 psi
Tensile Modulus: 165 ksi
Flexural Modulus: 130 ksi
Flexural Strength: 3000 psi
Elongation: 9.6% @ Yield
Izod Impact Strength: 1.4 ft.-lb/in.
Hardness: 64.9 (Shore D)
Heat Deflection Temp: 188°F

Frequently Asked Questions

Why should I buy from Interstate Advanced Materials?
We've been in the Plastic business for decades and maintain a quality stock of all types of plastics and accessories, shipped quickly to you.

What is Interstate Advanced Materials's Shipping Policy?
Our shipping policy can be found here and orders placed for non-cut-to-size stock items typically ship within 3 working days.

Is Interstate Advanced Materials site secure?
Absolutely. Your information is passed through our https site when you make a purchase. Your Credit Card is never stored on file.

WARNING: This product can expose you to chemicals including Bisphenol A, CAS 80-05-7, which are known to the State of California to cause birth defects or other reproductive harm. For more information go to
Disclaimer: Interstate Advanced Materials makes no representations about any of its products that are modified in any way after they leave its possession, nor do its representations apply when any of its products are improperly used or stored. Each customer of Interstate Plastics bears full responsibility for making its own determination as to the suitability of each material, product, recommendation or advice provided by Interstate Plastics. Each customer of Interstate Plastics must identify and perform all tests and analyses necessary to assure that its finished parts incorporating materials from Interstate Plastics will be safe and suitable for use under end-use conditions.