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What is Shore hardness in EVA foam(Rubble and plastic)?

Views: 117     Author: Site Editor     Publish Time: 2022-07-12      Origin: Site

What is Shore hardness in EVA foam(Rubble and plastic)?


  • What is shore hardness?

Shore hardness is the measure of a particular material’s resistance to penetration or indentation. Basically, it tells you how hard a material is and how much force it can take.


The Shore hardness scale was invented by Albert Ferdinand Shore in around 1920 and has been used ever since.


  • How is shore hardness tested?

Shore hardness is tested using a durometer, which is a needle-like instrument that measures the depth of an indentation in the seal created by a standard amount of force. Durometer hardenss tester an instrument used to characterize the hardenss of elastomers or other rubber - like materials EVA foam sheet we are making for our customer. Normally, we use the durometer(Model: GS-701N) made by TECLOCK in Japan.



Durometer -Teclock

Durometer  -Teclock

Hardness tester-Teclock

Hardness tester-Teclock


  • How do you measure the hardness of EVA foam sheet?

The Teclock durometer can be used in EVA foam sheet and this hardness tester is placed on the sample and its own weight exerts constant pressure to move the indentor. The depth of the indentor is measured which provides a measure of the EVA foam material's hardness, see beow table for reference.



DurometerRubber/Plastic

Model

Pattern

According   to standard

Is   suitable the material quality

Marking pin shape (mm)

Standard load   capacity value (0-100)

GS-701N

SRIS C

SRIS
  Japanese rubber association standard

Soft rubber, sea   rubber, for example: The eraser, degree of hardness is smaller than A TYPE20

Diameter   5.08
  Hemisphere

539-8379mN
  (55-855gf)

GS-701G

GS-702N

ASTM D

JISK   7215,ISO868
  ASTM D 2240

For   example: Rigidified rubber, revertex
  Degree of hardness is bigger than A TYPE 90

Sharp   diameter R0.1
  30° circle

04-44483mN
  (0-4536gf)

GS-702G



Thinkness Gauger

Model

Slightly reads the value
  (mm)

Determination scope
  (mm)

Determines the throat to be deep
  (mm)

Determination pressure

On measures

a style
  (mm)

Next measures a style
  mm

Weight (g)

SM-112


0.01

10

26

2.5(250)

∮10

∮10

160

SM-112LS

0.01

10

planes∮3.2(1/8)

Planes ∮10


  • The types of shore hardness scales



  • Shore 00 Hardness Scale measures materials such as EVA foams, gels, sponges and very soft rubber.

  • Shore 0 Hardness Scale measures soft to medium rubbers and also soft plastics

  • Shore A Hardness Scale measures the hardness of mold rubbers. These are softer and more flexible materials in general, but the scale gives an indication of whether they are extremely soft or if they are more rigid. In addition to soft rubbers, semi-rigid plastics can also be tested on the Shore A scale, but at the higher level.

  • Shore B Hardness Scale measures mid range rubbers and plastics, this can be a good choice to measure if you deal with a variety of materials.

  • Shore C Hardness Scale measures medium rubbers up to hard plastics.

  • Shore D Hardness Scale measures hard rubbers, semi-rigid plastics and hard plastics. Generally, the rubbers are on the low end of the scale, while the hardest plastics receive the highest Shore D ratings.


  • Levels of shore A hardness


  • 10A Shore Hardness: Extremely  soft material that can catch throughout the grooves, creating a ‘snake skin’ style that can push excess material out of the application. While it doesn’t impact the functionality, it does wear out quickly.

  • 20A Shore Hardness: Similar to that of a rubber band, it extrudes smoothly and is able to seal rough  areas and grooved, uneven applications.

  • 40A Shore Hardness: A  flexible and slightly more durable material that has the hardness of a  pencil eraser, the EVA foams can be used in applications that are rough  and do not undergo too much pressure.

  • 70A Shore Hardness: The combination of malleability, hardness and durability makes this the  standard for most EVA foams.

  • 90A  Shore Hardness: This kind of EVA foam is harder which able to withstand more pressure and extrusion. These materials are longer-lasting and can be used in dynamic applications.



EVA cutting workshop

EVA cutting workshop




CNC machining wrokshop for EVA foam

CNC machining wrokshop for EVA foam

CNC machining process for EVA foam

CNC machining process for EVA foam



EVA for Sports insoles

EVA for Sports insoles 

EVA for Sports insoles

EVA for Sports insoles



EVA for packaging of electronic products

EVA for packaging of electronic products

EVA for packaging

EVA for packaging




EVA inside tray for packaging of electronic products made by CNC machining process -2

EVA inside tray for packaging of electronic products made by CNC machining process 

EVA inside tray for packaging of electronic products made by CNC machining process

EVA inside tray for packaging of electronic products made by CNC machining process 




  • How to find the right shore hardness for you?


No matter what type of application you have or the style of EVA foam required, our expert team will help you find the perfect material based on shore hardness. Please contact us at sales@shunhogroup.com.hk



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guan Avenue, Dongcheng District , 
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