Summary for rubber hs 84 Discussion
rubber hs 84 is explained in the thread as a hardness specification, not a rubber type. Tom Gobban asked what “rubber HS 84” meant after seeing it on an engineering drawing. The answer says it refers to rubber with a specific hardness, likely 84 Shore as measured with a durometer, and notes that 84 Shore is fairly hard. The responder also points out that the exact rubber family still matters for the application, such as butyl, nitrile, or silicone, so hardness alone does not identify the material. The practical advice is to ask the designer who signed the drawing for clarification, because that is usually more useful than asking the buyer. No one in the thread suggests that “HS 84” is a standard rubber grade name.
Q. Luckily I have found a placement in an engineering company. On a drawing I have been confronted with the reference “rubber HS 84”. Despite researching the internet I cannot find what kind of rubber it is. Can anybody help me?
Thanks,
Tom
Tom Gobban
Placement – Dublin, Ireland
August 6, 2012
A. Hi Tom
What you have there is a requirement for rubber of a specific hardness. Rubber hardness is usually quoted in Shore units measured with a durometer. 84 Shore is fairly hard.
Depending on the application, you have several other questions to answer about the type of rubber, butyl, nitrile, silicone etc.
The simplest way with any drawing question is to ask the designer who signed the drawing. Avoid asking the buyer – it rarely produces any useful information.
Geoff Smith
Hampshire, England
August 12, 2012
Q. I’m having issues with gasket similar to valve cover gasket (plastic) found on engines. The issue I’m having is that the gaskets hardness would vary from time to time and the workers would be able to tell the difference because they use it all the time. I finally got a batch of gaskets that I was able to tell the difference.
My question are:
How do I measure the rubber hardness of the gasket using a durometer tester? Do I melt the gasket into a shape (cube, cylindrical, etc) before measuring it?
How does the gasket vary from batch to batch if everything (Arburg 420C machine) is pre-set already?
Tou Vang
– Clovis, California, USA
November 20, 2012