Woodwind.OrgThe Clarinet BBoardThe C4 standard

 
  BBoard Equipment Study Resources Music General    
 
 New Topic  |  Go to Top  |  Go to Topic  |  Search  |  Help/Rules  |  Smileys/Notes  |  Log In   Previous Message  |  Next Message 
 Re: Oxidized hard rubber
Author: L. Omar Henderson 
Date:   2006-08-14 02:24

Unfortunately rubber formulations over 20-30 years ago were not very well standardized and sulfur concentrations (used as a catalyst) in vulcanization as well as curing regimes were also variable. I have seen old mouthpieces and clarinets from the same maker that have not turned colors while others appear in many shades of brown, green, yellow, etc. The colorant in all cases that I have tested is sulfur compounds. The coloration is usually less than 03 mm deep and abrasion to remove the colored compounds is one answer but the specimen will eventually again turn color (depending on environmental conditions) because of the excess sulfur in the material and its ability to migrate to the surface. Analysis of the polymerization patterns in these colored items also indicates a less crosslinked pattern than those that have not turned colors. Environmental conditions no doubt contribute to the speed and severity of coloration.

All vulcanized rubber will deteriorate - meaning loosing the original number and degree of crosslinking bridges - over time. If excess sulfur was present as a catalyst it can migrate to areas of less crosslinking more easily - usually the surface. The formation of colored sulphur compounds is complex and they are relatively stable. Reversing the chemistry to form different compounds - i.e. black - is also complex and takes strong reagents, heat, and proper timing. A good professional epoxy black paint job may be a reasonable alternative if you do not like the colored patina.
L. Omar Henderson
 Reply To Message  |  Avail. Forums  |  Flat View   Newer Topic  |  Older Topic 

 Topics Author  Date
 Oxidized hard rubber  new
EuGeneSee 2006-08-12 19:58 
 Re: Oxidized hard rubber  new
L. Omar Henderson 2006-08-13 21:30 
 Re: Oxidized hard rubber  new
bwilber 2006-08-13 21:55 
 Re: Oxidized hard rubber  new
LaBelleEpoque 2018-09-11 05:01 
 Re: Oxidized hard rubber  new
LaBelleEpoque 2014-05-30 18:58 
 Re: Oxidized hard rubber cleaning !  new
Don Berger 2006-08-13 23:19 
 Re: Oxidized hard rubber  new
EuGeneSee 2006-08-13 23:48 
 Re: Oxidized hard rubber  new
bwilber 2006-08-14 01:29 
 Re: Oxidized hard rubber  new
Gordon (NZ) 2006-08-14 01:20 
 Re: Oxidized hard rubber  new
LaBelleEpoque 2018-09-11 05:02 
 Re: Oxidized hard rubber  new
L. Omar Henderson 2006-08-14 02:24 
 Re: Oxidized hard rubber  new
Vytas 2006-08-14 03:06 
 Re: Oxidized hard rubber  new
EuGeneSee 2006-08-14 12:17 
 Re: Oxidized hard rubber  new
L. Omar Henderson 2006-08-14 12:23 
 Re: Oxidized hard rubber  new
LaBelleEpoque 2018-09-11 05:06 
 Re: Oxidized hard rubber  new
Tony F 2018-09-11 09:33 
 Re: Oxidized hard rubber  new
EuGeneSee 2006-08-14 12:33 
 Re: Oxidised hard rubber  new
Gordon (NZ) 2006-08-14 12:47 
 Re: Oxidized hard rubber  new
Don Berger 2006-08-14 13:28 
 Re: Oxidized hard rubber  new
Vytas 2006-08-14 19:39 
 Re: Oxidized hard rubber  new
Mark Charette 2006-08-14 19:48 
 Re: Oxidized hard rubber  new
LaBelleEpoque 2018-09-11 05:44 
 Re: Oxidized hard rubber  new
Vytas 2006-08-14 21:58 
 Re: Oxidised hard rubber  new
Gordon (NZ) 2006-08-14 22:50 
 Re: Oxidized hard rubber  new
Vytas 2006-08-14 23:54 
 Re: Oxidized hard rubber  new
Mark Charette 2006-08-15 01:13 
 Re: Oxidized hard rubber  new
Mark Charette 2006-08-15 01:25 
 Re: Oxidized hard rubber  new
Vytas 2006-08-15 00:42 
 Re: Oxidized hard rubber  new
Vytas 2006-08-15 02:37 
 Re: Oxidised hard rubber  new
Gordon (NZ) 2006-08-15 12:24 
 Re: Oxidized hard rubber  new
BobD 2006-08-15 14:04 
 Re: Oxidized hard rubber  new
EuGeneSee 2006-08-15 14:45 
 Re: Oxidized hard rubber  new
Mark Charette 2006-08-15 14:59 
 Re: Oxidized hard rubber  new
Anonymous666 2010-09-13 11:45 
 Re: Oxidized hard rubber  new
L. Omar Henderson 2010-09-13 13:02 
 Re: Oxidized hard rubber  new
Lelia Loban 2010-09-13 13:35 
 Re: Oxidized hard rubber  new
Anonymous666 2010-09-17 06:34 
 Re: Oxidized hard rubber  new
Jack Kissinger 2010-09-13 16:31 
 Re: Oxidized hard rubber  new
L. Omar Henderson 2010-09-13 17:51 
 Re: Oxidized hard rubber  new
Tom Ridenour 2014-05-30 20:39 
 Re: Oxidized hard rubber  new
The Doctor 2014-05-30 21:48 
 Re: Oxidized hard rubber  new
Ken Shaw 2014-05-30 23:51 
 Re: Oxidized hard rubber  new
Tony F 2014-05-31 06:08 
 Re: Oxidized hard rubber  new
Paul Aviles 2014-05-31 14:04 
 Re: Oxidized hard rubber  new
Tony F 2014-05-31 14:16 
 Re: Oxidized hard rubber  new
Ursa 2014-05-31 18:20 
 Re: Oxidized hard rubber  new
NoradBob 2018-09-07 21:24 
 Re: Oxidized hard rubber  new
Dan Shusta 2018-09-07 22:20 
 Re: Oxidized hard rubber  new
shmuelyosef 2018-09-11 03:12 
 Re: Oxidized hard rubber  new
NBeaty 2018-09-14 22:06 
 Re: Oxidized hard rubber  new
clarimad 2018-09-15 01:50 
 Re: Oxidized hard rubber  new
donald 2018-09-15 02:25 


 Avail. Forums  |  Need a Login? Register Here 
 User Login
 User Name:
 Password:
 Remember my login:
   
 Forgot Your Password?
Enter your email address or user name below and a new password will be sent to the email address associated with your profile.
Search Woodwind.Org

Sheet Music Plus Featured Sale

The Clarinet Pages
For Sale
Put your ads for items you'd like to sell here. Free! Please, no more than two at a time - ads removed after two weeks.

 
     Copyright © Woodwind.Org, Inc. All Rights Reserved    Privacy Policy    Contact charette@woodwind.org