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SILICONE RUBBERS

General Characteristics of silicone rubbers

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(VMQ Vinyl MethylSiloxane)

Renowned chemist Frederick Kipping was a pioneer in the study of organic compounds with carbon and silicon molecules and was responsible for the name 'silicone'. Silicone is a combination of quartz rock and carbon at high temperatures, obtaining a silicon-based rubber. From this basic substance other physical states such as gels, oils and solids are formed.

Silicone has a high transparency, is versatile and has an excellent behaviour in different physical and chemical working conditions. It can be transformed by injection, compression moulding, extrusion, autoclave, casting, etc.

Thermal Resistance: Silicone rubberus have an excellent behaviour and stability at temperatures from -55 �ï�¿�½C up to � �ï�¿�½C and our THT silicones can work up to �ï�¿�½C in dry heat. There are silicones which can reach working temperatures of -90 �ï�¿�½C, such as the Phenyl-Vinyl-Methyl-Siloxanes (PVMQ). We have special vapour resistant (wet heat) silicones which are stable up to 힝 �ï�¿�½C constant temperature.

Non toxicity standards:Inert material which can comply the following international standards for medical, pharmaceutical and foodstuff contact:: FDA CFR 177.2600 (US Food and DrugAdministration), BgVVBfR cap.15 (Bundesinstitut f�ï�¿�½r Gesundheitlichen Verbraucherschutz Und Veterin�ï�¿�½rmedizin), USP Clase VI (US Pharmacopoeia), EC 1935/2004 Regulation, Journal officiel de la Republique Fran�ï�¿�½aise brochure 1227.

Non porous Surface: Non adherent to most products and adhesives, silicone is water repellent and water- proof.

Dielectric properties: Silicone rubbers are one of the best electric insulators with the possibility of working from -40 �ï�¿�½C to ퟍ �ï�¿�½C. We can supply special conductive silicone formulations.

Mechanical properties: Compared to other organic elastomers, silicone does not stand out for its mechanical properties, but combined with its high temperature resistance it is unbeaten by other rubbers. We have specific formulations for high mechanical strength, abrasion resistance, high elasticity, high tear strength, etc.

Weather resistance: Offers excellent resistance to all weather conditions, ozone, pyralene and UV radiation.

Chemical resistance: Silicone rubbers have a good response when in contact with most chemical compounds, but are affected by fats, solvents and petrols.
With fluorosilicones we obtain superb anticorrosion results in most conditions.

Colours: Standard silicone is translucent, but can be pigmented with foodstuff contact approved colours to achieve any RAL upon request. We can also supply luminescent, fluorescent and metallic colours. We transform platinum- cured silicones for those items exposed to sun rays, that need a high transparency or to avoid yellowing due to ageing.

Vulcanisation: Silicone rubbers are vulcanised with different catalysts depending on the process used to vulcanise them. The most common catalysts are:
DBPH (2,5-Dimethyl-2,5-di (tert-butylperoxy) hexane), mostly used for moulding.
DCBP (2,4-dichlorobenzoyl peroxide)
and addition catalysts commonly known as platinum curing, being especially suited for medical, pharmaceutical applications and foodstuff contact used in extrusion.

Post-curing: Peroxide- or platinum-cured silicones must be post-cured at �ï�¿�½C for a minimum of ten hours in air recirculating ovens to remove all volatile residues and make them suitable for foodstuff contact, as well as certifiable as medical grade.

Hardness and density: We offer from 25 Shore A to 90 Shore A hardness in compact silicone(our standard being 65 Shore) and 0.25 gr/cm3 to 0.8 gr/cm3 density in sponge silicones (our standard is 0.25 gr/cm3). 20 shore A compact silicones and 0.15 gr/cm3 are in development and approval stages.

Main products and shapes: Tubes, reinforced tubes, hoses, cords, profile, flat die-cut gaskets, moulded seals, inflatable seals, heat-vulcanised seals, encapsulated o-rings, rectangular profiles, square profiles, moulded parts, sheets, rolls, with textile or metal inserts, multicomponent parts, etc.

Main applications: Pharmaceutical, chemical, medical, aeronautics, space industries, laboratories, foodstuff, cosmetics, packaging, fluids, metal carpentry, construction, lighting, electronics, car industry, machinery manufacturing, etc.

Technical Data Sheet

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BASES AVAILABLE FOR EXTRUSION IN STANDARD SERIES COMPACT SILICONE RUBBER
Properties Rules Units 135 160 175 180
General
Characteristics
Appearance Translucent
Density ISO R1183 (g/cm3) 1,11 1,14 1,18 1,21
Thermal Resistance Good stability until 200 °C
Propieties
Mechanical
Post cured
Type Catalyst Peróxido
Catalyst Content (parts) 1,1 1,25 1,25 1,25
Post cured 4 horas a 200 °C
Shore hardness A ASTM D 2240 41 62 75 81
Tensile strength ISO R37 (MPa) 8,2 11 9,3 9
Elongation at break ISO R37 (%) 420 385 260 200
100% elongation module ASTM D 412 (MPa) 1,1 2,2 3,4 5,3
Tear ASTM D 624A (kN/m) 17 21 21 19
Deformation Remaining
(22h/177°C/25%)
ASTM D 395B (%) 39 35 37 49
Resilience ISO 4662 (%) 53 53 45 46
Linear contraction (%) 3,1 2,6
Propiedades
Dieléctricas
Post cured
Dielectric strength (Espesor 1 mm) kV/mm 29
Dielectric strength (Thickness 2 mm) kV/mm 21
Breaking Tension Kv
Dielectric Constant 2,5
Dissipation factor 3,4 x 10-3
Transversal resistivity Ohm·cm 2,6 x 1015


BASES FOR EXTRUSION IN COMPACT SILICONE RUBBER SERIES HIGH MECHANICAL RESISTANCE (H.M.R)
Properties Rules Units 345 360 370
General
Characteristics
Appearance Translucent
Density ISO R1183 (g/cm 3) 1,1 1,16 1,18
Thermal Resistance Good stability up to 200 ° C
Propieties
Mechanical
Post cured
ype Catalyst Peroxide
Catalyst Content (parts) 1 1,25 1
Post cured 4 horas a 200 °C
Shore hardness A ASTM D 2240 45 62 70
Tensile strength ISO R37 (MPa) 7,2 9 9,3
Elongation at break ISO R37 (%) 460 430 440
100% elongation module ASTM D 412 (MPa) 1,2 2,6 2,9
Tear ASTM D 624A (kN/m) 31 35 40
Deformation Remaining
(22h/177°C/25%)
ASTM D 395B (%) 42 48 52
Resilience ISO 4662 (%) 48 47 36
Linear contraction (%) 3,2 3,4 3,3
Propertie
Dielectrics
Post cured
Dielectric strength kV/mm
Breaking Tension kV
Dielectric Constant
Dissipation factor
Transversal resistivity Ohm·cm


BASES FOR EXTRUSION IN INDUSTRIAL SERIES COMPACT SILICONE RUBBER
Properties Rules Units 940 950 960 970 980
General
Characteristics
Appearance Translucent Translucent Translucent
Density ISO R1183 (g/cm 3) 1,11 1,11 1,15 1,17 1,18
Thermal Resistance 225 °C 200 °C 200 °C 225 °C 200 °C
Thermal Resistance (W/ºC·m) 0,25
Propieties
Mechanical
Post cured
Type Catalyst Peroxide
Catalyst Content (parts) 1,25 1,25 1,25 1,25 1,25
Post cured 4 horas a 200 °C
Shore hardness A ASTM D 2240 46 50 61 70 78
Tensile strength ISO R37 (MPa) 7,8 7,4 7,0 8,3 8
Elongation at break ISO R37 (%) 515 365 250 350 230
100% elongation module ASTM D 412 (MPa) 1 1,5 2,25 2,3 3,8
Tear ASTM D 624A (kN/m) 13 13 11 18 16
Deformation Remaining
(22h/177°C/25%)
ASTM D 395B (%) 27 34 25 42 34
Resilience ISO 4662 (%) 61 56 57 54 60
Linear contraction (%) 2,8 2,8 2 3
Propiedades
Dielectrics
Post cured
Dielectric strength kV/mm 19 23 21 23
Breaking Tension kV 45,4 45 44
Dielectric Constant 2,8 2,8 2,8 2,9
Dissipation factor 0,007 3,5 x 10 -3 3,5 x 10 -3 3 x 10 -3
Transversal resistivity Ohm·cm 2 x 10 14 2,2 x 10 14 2,2 x 10 14 1,2 x 10 15
 

Resistance Table

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BASES AVAILABLE FOR EXTRUSION IN RUBBER OF SPONGE SILICONE
Properties Rules Units White silicone
Características
Generales
Appearance White
Density BS-EN-ISO 845 g/cm 3 0,250±0,040
Thermal Resistance ºC -50ºC / +200ºC
Shore hardness OO ASTM D2240 45±5
DShore hardness A ASTM D2240 5±2
Properties
Mechanical
Post cured
Compression stress BS-EN-ISO 3386 part 1.2 kPa 90±40
Breaking strain BS-EN-ISO 1798 (0,75min.) N.mm -2 1,2
Tear BS-EN-ISO1798 (100min.) % 200
Deformation Remaining BS-EN-ISO 1856 (22h/70ºC) % 10
Fragility point ASTM D746 ºC -80
Oxygen index limit BS 2872 Part 1 % 24
Thermal conductivity VDE 0304 W.m -1.K -1 0,24
Radiation resistance >10 5 Grays (10 5 Rads)
Propiedades
Dielectrics
Post cured
Dielectric Coefficient VDE 0303 2,9
Dielectric strength VDE 0303 kV.mm -1 23
Dissipation coefficient at 50c/s VDE 0303 3x10 -4
PTFE coated glass fabrics (TVT)
Chemical Products Pure Carbon Graphite Bronze Glass Fibre
Acetaldehide Excellent Excellent Excellent Excellent
Acetone Excellent Excellent Excellent Excellent
Aluminium Sulphate Excellent Excellent Good Excellent
Ammonium chlorate Excellent Excellent Bad Excellent
Ammonium hidroxide Excellent Excellent Bad Good
Aniline Excellent Excellent Bad Excellent
Benzene Excellent Excellent Excellent Excellent
Boric acid Excellent Excellent Excellent Excellent
Brine Excellent Excellent Excellent Excellent
Bromium (Anhidrous) Excellent Bad Bad Good
Carbon disulphate Excellent Excellent Excellent Excellent
Chloracetic acid Excellent Excellent Good Excellent
Clorobenzene Excellent Excellent Excellent Excellent
Chloroform Excellent Excellent Excellent Excellent
Cromic acid Excellent Good Bad Good
Citric acid Excellent Excellent Excellent Excellent
Diethyl ether Excellent Excellent Excellent Excellent
Ethyleneglycol Excellent Excellent Excellent Excellent
Fatty acids Excellent Excellent Excellent Excellent
Iron chlorate Excellent Excellent Bad Excellent
Iron sulphate Excellent Excellent Bad Excellent
Fluorosilic acid Excellent Good Bad Bad
Formic acid Excellent Excellent Excellent Excellent
Freon (liquid) Excellent Excellent Excellent Excellent
Hydroborid acid Excellent Excellent Bad Good
Hydrochloric acid Excellent Excellent Bad Good
Hydrocianic acid Excellent
Hydrofluoritic acid Excellent Excellent Bad Bad
Acid solution of iron sulphate Excellent Excellent Bad Bad
Maleic acid Excellent Excellent Excellent Excellent
Mercury salts Excellent Excellent Good Excellent
Naphta Excellent Excellent Bad Good
Naphtaline Excellent Excellent Bad Excellent
Nickel salts Excellent Excellent Excellent Excellent
Nitric acid (0-50%) Excellent Excellent Excellent Excellent
Nitrobenzene Excellent Excellent Excellent Excellent
Phenol Excellent Bad Bad Good
Phosphoric acid Excellent Excellent Excellent Excellent
Phtalic acid Excellent Excellent Good Excellent
Picric acid Excellent Excellent Excellent Excellent
Pyridine Excellent Excellent Excellent Excellent
Salicilic acid Excellent Good Bad Good
Silver nitrate Excellent Excellent Excellent Excellent
Sodium carbonate Excellent Excellent Excellent Excellent
Sodium hydroxide Excellent Excellent Excellent Excellent
Sodium nitrate Excellent Excellent Excellent Excellent
Sodium peroxide Excellent Excellent Bad Excellent
Sodium silicate Excellent Excellent Bad Excellent
Sodium sulphat Excellent Good Bad Bad
Sulphuric acid Excellent Excellent Excellent Excellent
Tannic acid Excellent Excellent Bad Good
Tartaric acid Excellent Excellent Bad Good
Trichloroethylene Excellent Excellent Bad Bad
Zinc chlorate Excellent Excellent Bad Bad

Tolerance Margin

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In the extrusion processes of silicone rubbers, greater tolerances are needed, than those molding processes since when the silicone is extruded and it exits through the tool / row it expands and during the curing and post-curing processes it undergoes contractions and deformations.

The deformation at the extrusion outlet can be controlled by different supports, which will depend on the degree of control, size and section that is required. The characteristics of the profile to be manufactured determine the applicable tolerance in each dimension. In certain synthetic rubbers, the E1 standard cannot be achieved.

In the process of longitudinal cutting, precision and tolerance will be given by the technology we use in cutting.

In the molding process, every piece has to be manufactured with a surplus of rubber to complete the figure of the mold and so the excess flows through the short burr, an excess of material will cause the vertical axis (Thickness) to vary. We must take into account that for the correct application of the standard, there are fixed dimensions, which are those of the horizontal part of the mold (H) and those of thickness (V), which are those of vertical axis. For the calculation of vertical tolerances, the maximum height of the piece must be used.

There are 3 types of internationally accepted tolerances, "E" for Extrusion, "L" for Longitudinal cutting and "M" for Molding:

  • Class E1, L1 y M1 = Maximum quality
  • Class E2, L2 y M2 = Good quality
  • Class E3, L3 y M3 = No criticism

EXTRUSION TOLERANCES IN THE PROFILE SECTION FOR NON-REINFORCED HANDS
( ISO 3302-1:1996(E) CLASE E )
from
(mm)
to
(mm)
Class E1
(+ / - mm)
Class E2
(+ / - mm)
Class E3
(+ / - mm)
Dimension
Nominal
01,50,150,250,40
1,52,50,200,350,50
2,54,00,250,400,70
4,06,30,350,500,80
6,3100,400,701,00
10160,500,801,30
16250,701,001,60
25400,801,302,00
40631,001,602,50
631001,302,003,20

CUTTING TOLERANCES FOR EXTRUDED SILICONE RUBBER PROFILES WITHOUT REINFORCEMENT
( ISO 3302-1:1996(E) CLASE L )
desde
(mm)
hasta
(mm)
Class L1
(+ / - mm)
Class L2
(+ / - mm)
Class L3
(+ / - mm)
Length
Nominal
0400,701,001,60
40630,801,302,00
631001,001,602,50
1001601,302,003,20
1602501,602,504,00
2504002,003,205,00
4006302,504,006,30
63010003,205,0010,00
100016004,006,3012,50
160025005,0010,0016,00
250040006,3012,5020,00
4000---0,16%0,32%0,50%


MOLDING TOLERANCES FOR RUBBERS
( ISO 3302-1:1996(E) CLASS M )
from
(mm)
to
(mm)
Class M1
V (+ / - mm) H
Class M2
V (+ / - mm) H
ClaseM3
V (+ / - mm) H
Class M4
F(+/- mm)H
Dimension
Nominal
040,080,100,100,15---------
46,30,10,120,150,200,250,400,50
6,3100,100,150,200,200,300,500,70
10160,150,200,200,250,400,600,80
16250,200,200,250,350,500,801,00
25400,200,250,350,400,601,001,30
40630,250,350,400,500,801,301,60
631000,350,400,500,701,001,602,00
1001600,400,500,700,801,302,002,50
160---0,3%0,4%0,5%0,7%0,8%1,30%1,50%

TOLERANCES OF CALANDRADO PLANCHA DE SILICONA ESPONJA
from
(mm)
to
(mm)
Tolerance
(+ / - mm)
Dimension
Nominal
1,67,000,50
7,5010,000,80
11,0011,501,00
>11,5017,001,50
>17,0019,001,90
>19,0020,002,00
>20,0025,001,60
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