Don’t see the answer to a question you might have? Ask your question on our Contact Form and an HSPP representative will respond as quickly as possible.

We can provide mill test reports for any order. Please ask our salespeople and they will email you the test report. If you let us know in advance that you require test reports, we can have them sent to you when your order ships. We can also retrieve them after your order has shipped. If you need to know the heat and plate number of individual parts in an order, please let us know at the time of ordering so the individual parts can be marked accordingly.

In an impact test, the test specimen is shaped like a rectangle. The term “longitudinal” or “transverse” refers to whether the grain of the steel in the test specimen runs the length of the rectangle (“longitudinal”) or the width of the rectangle (“transverse”). Please refer to our Understanding Impacts sheet to learn more.

We calculate the weight of a steel plate using the formula: thickness x width x length x 0.2836 (the density of steel).  For example, a plate that is 0.25” x 96” x 288” would be calculated as 0.25 x 96 x 288 x 0.2836 = 1960 lbs.  When calculating the gross weight of a cut part, it is standard in the industry to add 0.5” to the length and width dimensions as a “kerf allowance”.  The kerf allowance captures the weight of the steel (or “kerf”) that is melted away as part of the cutting process.


“Cat 3” is short for Category 3, which refers to a specific category of Charpy V-notch longitudinal impact test temperature in the CSA G40.21 specification.  There are five categories in total:


Standard Test Temperature

















To be specified by purchaser

The minimum longitudinal average absorbed energy level for 50WT for categories 1 through 4 is 27J (20 ft lbs.).  For 100QT for categories 1 through 4 the minimum is 34J (25 ft lbs.).


Please see the following documents for information:

Cleveland-Cliffs (HARDWEAR) (Interplate Zero, datasheet and SDS)

Dillinger (DILLIDUR, DILLIMAX) (Hempel ZS 15890, overview, datasheet, and SDS base \ and SDS curing agent)

Jiangyin Xingcheng (XCHD) (Hempatex Enamel 5636V, datasheet and SDS)

NLMK Clabecq (Quard, Quend) (Hempel ZS 15890, datasheet and SDS base and SDS curing agent; and Jotun Muki Z 2001, datasheet and SDS A and SDS B)

SSAB (Hardox, Strenx) (Tech Support #25)

voestalpine (durostat) (Hempel ZS 15890, datasheet and SDS base and SDS curing agent)

We take customer confidentiality very seriously. In many cases, we have non-disclosure and confidentiality agreements in place. Even where we don’t have formal agreements set up, we understand that our customers trust us with valuable and often proprietary drawings and designs. We have a responsibility to honour that trust, and a reputation for integrity to protect. All of our employees are governed by confidentiality obligations as part of their employment agreements, and only those who need to do so handle customer drawings. Multiple anti-malware and anti-ransomware services protect our servers, which have multi-factor authentication and secured access throughout. Any photos we share online – through this website for example – have been carefully selected to obscure design details and identifying marks. Although we have a limited social media presence, we are not in the habit of posting photos of our work. We will never knowingly identify our customers or their parts in a social media post without their consent.



You can never know too much. Our extensive catalogue of insights, information and tools can help you understand more about the world of high-strength and abrasion-resistant steel.

Learn more about the “how” behind the work that we do.
Get answers to some of our most popular questions.
Online conversion calculators for temperature, weight, volume, energy and more.