Hersan Rubber Industry Technical Information

General Properties of Rubber

General Name Natural Rubber SBR EPDM Neoprene CSM Nitrile  HNBR Butyl Silicone Florocarbon Florosilikone Acrylic Vamak Epiclorhydrine 
Chemical Polyisoprene Styrene Butadiene Rubber Ethylene Propilene Rubber Chloroprene Rubber Hypalon Rubber Acrylonitrile Butadien Rubber Hidrogenated Nitrile Rubber Butyl Rubber Silicone Rubber Florocarbon Rubber Florosilicone Rubber Polyacrylic Rubber Ethylene Acrylic Rubber Epiclorohydrine Rubber
Abbreviation NR SBR EPDM CR CSM NBR HNBR IIR VMQ FKM FQ ACM AEM ECO
Hardness Range ( IRHD ) 30 – 95 40 – 95 30 – 85 30 – 90 40 – 85 40 – 100 50 – 95 40 – 85 40 – 80 50 – 95 40 – 80 50 – 85 45 – 90 40 – 85
Service Temperature Range                        
Max. 75 C 80 C 130 C 95 C 130 C 100 C 150 C 120 C 205 C 205 C 180 C 150 C 150 c 140 C
Max. Intermittent 105 C 115 C 150 C 125 C 160 C 130 C 180 C 135 C 300 C 250 C 200 C 180 C 180 C 160 C
Min. – 60 C – 55 C – 50 C – 40 C – 25 C – 50 C .. – 10 C – 30 C – 50 C – 50 C – 20 – 60 C – 20 C – 40 C – 30 C
                  * special types  – 80 C          

Enviromental Resistance Properties of Rubber

Polymer NR IR SBR IIR BR EPDM CR NBR HNBR VMQ FVMQ ACM FKM ECO
Oxidation Resistance 3-2 3-2 3-2 1 3-2 2-1 2-1 3-2 1 1 1 1 1 2-1
Ozone Resistance 4 4 4 2-1 4 1 2 4 2-1 1 1 2-1 1 1
Weathering Resistance 4 4 4 1 4 1 2 3-2 2-1 1 1 1 1 2-1
Sunlight Resistance 4-3 4-3 4 1 4 1 2-1 4-3 2-1 1 1 1 1 2-1
Water Resistance 1 1 2-1 1 1 1 2 2-1 1 2 1 4-3 2-1 2
Flame Resistance 4 4 4 4 4 4 2 4 4 3-2 1 4 2-1 3-2
Heat Resistance 4 4-3 3-2 2 4-3 2-1 3-2 2 3-2 1 1 1 1 2-1
Low Temperature Flexibility 2-1 2 2 3-2 2-1 2-1 4 3-2 3-2 1 1 4-3 3-2 3-2
1 = Excellent     2 = Good     3 = Fair     4 = Poor

Chemical Resistance Properties of Rubber

Polymer NR IR SBR IIR BR EPDM CR NBR HNBR VMQ FVMQ ACM FKM ECO
Oil and Gasoline 4 4 4 4 4 4 3-2 1-2 2-1 4-3 2 2 1 1-2
Animal and Vegetable Oils 3 3 3 1-2 3 2 2 1-2 2-1 3-2 1 1-2 1 1-2
Alcohols 2 2 2 2 2 3-2 1-2 3-2 2-1 2 2-1 4 3-2 2
Alkalies 3 3 3 1 3 1-2 1 1-2 1 4 1 4 3-2 3-2
Acids 3-2 3-2 3-2 1-2 3-2 2 2 2 2 3 1 3 2 4-3
Aliphatic Hydrocarbon Solvents 4 4 4 4 4 4 2 1 1 4-3 1 1 1 1-2
Aromatic Hydrocarbon Solvents 4 4 4 4 4 4 4-3 3-2 3-2 4-3 2-1 4-3 1 2
Oxygenated Solvents 2 2 2 1-2 2 1-2 4-3 4 2-1 3 2 4 4 4-3
1 = Excellent     2 = Good     3 = Fair     4 = Poor

For different environmental regions in the world, you may need different temperature resistance gaskets in your transformers. Figures 1 & 2 below could be helpful in your determinations.

Rubber and Cork Rubber Sheets

Rubber sheets can be manufactured from any type of rubber according to your need of performance. All our NBR, FKM, VMQ, FMVQ, HNBR, CR and Corkrubber sheets are designed as formulation for high performance in transformer industry with our experience of more than 50 years.

HERSAN STANDARD SHEET SIZES 
Width ( mm ) x Length ( mm ) Thickness ( mm )
540 mm * 540 mm 2 – 3 – 4 – 5 – 6 – 8 – 10 – 12
700 mm * 1000 mm 2 – 3 – 4 – 5 – 6 – 8 – 10 – 12
1000 mm * 1000 mm 2 – 3 – 4 – 5 – 6 – 8 – 10 – 12
1000 mm * 2000 mm 2 – 3 – 4 – 5 – 6 – 8 – 10 – 12
1000 mm * 10.000 mm *** 2 – 3 – 4 – 5 – 6 – 8 – 10 – 12
*** for only rubber sheets    
  HERSAN 101 HERSAN 102 HERSAN 103 HERSAN 104 HERSAN 105 HERSAN 106 HERSAN 107 HERSAN 108
MAX. TEMPERATURE  oC 125 125 125 125 125 180 130 130
MİN. TEMPERATURE oC -30 -45 -30 -35 -40 -30 -60 -60
HARDNESS Shore A 70 – 80 65 – 75 70 – 80 70 – 80 70 – 80 70 – 80 70 – 80 65 – 70
DENSITY – kg / m3 950 850 1100 950 1100 1100 1000 1050
RESISTANCE TO MINERAL OILS 1 1 1 1 2 1 2 3
RESISTANCE TO FUEL – GASOLINE  2 2 2 1 2 1 2 3
RESISTANCE TO ALKALI  2 2 2 2 1 1 2 2
RESISTANCE TO UV –  OZONE 2 2 2 2 1 1 1 1
*** Density may differ % 5, + or –
1 = good     2 = medium     3 = poor

Metric Ropes & Rubber and Corkrubber Strips

Transformer lid rubbers can be manufactured with all types of rubbers as per technical specifications.
Each item can be manufactured with different dimentions on customer request.

Standart Metrik O-Ringler
STANDARD METRIC O-RINGS 
Φ mm Roll Length ( mt )
6 mm 50
8 mm 50
10 mm 50
12 mm 50
14 mm 50
16 mm 50
20 mm 25
22 mm 25
24 mm 25
30 mm 25
Kare Kesitli Şeritler
MOST MANUFACTURED SIZES
Φ mm Roll Length ( mt )
8 x 12 50
10 x 20 25
12 x 20 25
10 x 25 25
10 x 30 25
20 x 30 25
12 x 40 25
10 x 100 10
Standart Mantarlı Kauçuk Şeritler
STANDARD RUBBERCORK STRIP SIZES 
Width ( mm )  Thickness ( mm ) Roll Length ( mt )
30 mm  4 –  6  10
40 mm  4 –  6  10
50 mm  4 –  6  10
60 mm  4 –  6  10
65 mm 4 10
70 mm 6 10
80 mm  6 – 8 – 10 10
100 mm  6 – 8 – 10 10

Bushing Gaskets NBR, FKM, VMQ, FVMQ, HNBR

O-Rings

Gaskets for Power Transformers

Rubber Cork Gaskets