Detailing World

Detailing World (http://www.detailingworld.co.uk/forum/index.php)
-   Waxes, Sealants & Paint Protection (http://www.detailingworld.co.uk/forum/forumdisplay.php?f=13)
-   -   Pencil hardness - is it relevant? (http://www.detailingworld.co.uk/forum/showthread.php?t=401428)

TOGWT 19-12-2017 11:53 AM

Pencil hardness - is it relevant?
 
Pencil hardness
http://togwt1980.blogspot.co.uk/2017...materials.html

Hardness: [In materials science, hardness is the characteristic of a solid material expressing its resistance to permanent deformation. There are three principal operational definitions of hardness: Scratch hardness, Indentation hardness, Rebound or dynamic hardness]

Modern clear coat urethane even though they are harder than lacquer paints, they still scratch more easily. And because they tend to be harder it's more difficult and time consumer to remove swirls and scratches. This is the main reason to take vendor claims of ‘provides 9H hardness ‘for what it is – totally irrelevant.

SBM 19-12-2017 12:08 PM

To add to this it is worth noting that there is no defined "standard" for both hardness and blackness of pencils. So one manufacturers 9H or HB pencil will not necessarily be the same as another's. ;)

TOGWT 20-12-2017 11:26 AM

Quote:

Originally Posted by SBM (Post 5415006)
To add to this it is worth noting that there is no defined "standard" for both hardness and blackness of pencils. So one manufacturers 9H or HB pencil will not necessarily be the same as another's. ;)

Use a Pencil set designed for pencil hardness testing – common brands include Mitsubishi UNI

kingswood 20-12-2017 01:05 PM

am i the only one who laughed like a school kid when i saw the title :lol:

surely its not just the hardness but length of the pencil too?! longer the better for value :lol:

TOGWT 21-12-2017 11:37 AM

Quote:

Originally Posted by kingswood (Post 5415323)
am i the only one who laughed like a school kid when i saw the title :lol:

surely its not just the hardness but length of the pencil too?! longer the better for value :lol:

YES

It's not the size that matters as long as there's lead in it ;)

matt525d 02-01-2018 05:46 PM

Feynlab done a great peice on hardness. Substrate is tr most important factor, when coatings are tested it’s done on a solid metal plate which is how they get the famous 9h from but as above, in the real world it don’t mean jack


All times are GMT +1. The time now is 04:33 PM.

Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.

DTO Garage vBulletin Plugins by Drive Thru Online, Inc.

vB.Sponsors