Materials

Simast produces any item according to design using any elastomer available on the market and supports the customer in the selection of the most suitable material for the use and the final result, offering customised solutions.
The constant research and the experience gained in over thirty years, have brought the Company to use the best materials available on the market, produced by leading qualified companies which provide, together with the product, the certificates of conformity with the requirements set out by the main international supervisory bodies (e.g. conformity for medical use or food grade certification).
Thanks to the internal department for mix production, and the continuous commitment in the study of new materials, Simast boasts the ability to produce mixes according to the specific requests of the customer, even for small quantities.
However, we are available to use the materials indicated and/or provided directly by the customer.
The following is a list of the elastomers commonly used in rubber molding:

Gomma naturale

SIGLA:
NR
NOME COMMERCIALE:
Gomma naturale
TEMPERATURE D’OPERATIVITA’:
Da -60° a + 80° C
DUREZZA DISPONIBILE:
Da 25 a 90 Sh A
APPREZZABILITA’:
Ottima resistenza alla compressione, eccellente elasticità, discreta resistenza all’abrasione, buona capacità di attrito.
SVANTAGGI:
Non resistente agli oli e ai Raggi UV
CAMPI D’IMPIEGO:
Tutti i prodotti che necessitano di qualità elastiche eccezionali

Copolimero Butadiene stirene

SIGLA:
SBR
NOME COMMERCIALE:
Stirolica
TEMPERATURE D’OPERATIVITA’:
Da -35° a +80° C
DUREZZA DISPONIBILE:
Da 40 a 90 Sh A
APPREZZABILITA’:
Buona resistenza all’acqua e ai liquidi impianti frenanti utilizzati in automotive
SVANTAGGI:
Poco resistente agli oli,ai Raggi UV, all’acqua e agli agenti meteo.
CAMPI D’IMPIEGO:
Pneumatici, guarnizioni per impianti frenanti

Copolimero Butadiene acrilonitrile

SIGLA:
NBR
NOME COMMERCIALE:
Nitrilica o Antiolio
TEMPERATURE D’OPERATIVITA’:
Da -40° a +110° C
DUREZZA DISPONIBILE:
Da 30 a 90 Sh A
APPREZZABILITA’:
Eccellente resistenza alla compressione, allo strappo e all’abrasione.
SVANTAGGI:
Poco resistente al caldo, e subisce gli effetti degli agenti meteo.
CAMPI D’IMPIEGO:
Tutti gli impieghi dove si necessita resistenza agli oli, industria automotive

Acrilonitrile butadiene idrogenato

SIGLA:
HNBR
NOME COMMERCIALE:
Gomma nitrilica idrogenata
TEMPERATURE D’OPERATIVITA’:
Da -35° a +130° C
DUREZZA DISPONIBILE:
Da 30 a 90 Sh A
APPREZZABILITA’:
Eccellente resistenza alla compressione, allo strappo e all’abrasione, maggiore resistenza del NBR alle temperature
SVANTAGGI:
Poco resistente al caldo, e subisce gli effetti degli agenti meteo.
CAMPI D’IMPIEGO:
Tutti gli impieghi dove si necessita resistenza agli oli, industria automotive

Policloroprene

SIGLA:
CR
NOME COMMERCIALE:
Neoprene®
TEMPERATURE D’OPERATIVITA’:
Da -20° a +95° C
DUREZZA DISPONIBILE:
Da 30 a 90 Sh A
APPREZZABILITA’:
Eccellente resistenza alla ammoniaca, discreta capacità di resistenza agli oli, buona resistenza agli agenti meteo.
SVANTAGGI:
Non compatibile con solventi.
CAMPI D’IMPIEGO:
Molto utilizzato nelle aziende di subacquea per le mute da sub

Termolimero etilene propilene / Diene coniugato

SIGLA:
EPDM
NOME COMMERCIALE:
Dutral Ter
TEMPERATURE D’OPERATIVITA’:
Da -45° a +140° C
DUREZZA DISPONIBILE:
Da 40 a 90 Sh A
APPREZZABILITA’:
Ottima resistenza agli agenti meteo, buona elasticità anche a temperature basse, resiste a temperature relativamente alte, resiste a gran parte degli agenti chimici di uso comune
SVANTAGGI:
Non resiste agli acidi, solventi e oli derivati dal petrolio.
CAMPI D’IMPIEGO:
Questo elastomero è uno dei più comuni e utilizzati, visto il buon compromesso tra costi e qualità. Disponibile con idoneità ad uso alimentare

Siliconica (Metilvinil Polisilossano)

SIGLA:
VMQ/LSR
NOME COMMERCIALE:
Silicone
TEMPERATURE D’OPERATIVITA’:
Da -60° a +220° C
DUREZZA DISPONIBILE:
Da 20 a 85 Sh A
APPREZZABILITA’:
Eccellente resistenza a temperature estreme, buona resistenza alle compressioni, alla acqua; igienico, alimentare e medicale.
SVANTAGGI:
Non eccellente elasticità.
CAMPI D’IMPIEGO:
Il silicone è utilizzati per molteplici impieghi, dal settore medicale, alimentare, igienico, e ovunque necessita una resistenza eccellente alle temperature estreme

Fluoro elastomero (Esafluoropropilene – Vinilidenfluoruro)

SIGLA:
FKM/FPM
NOME COMMERCIALE:
Viton®, Tecnoflon®
TEMPERATURE D’OPERATIVITA’:
Da -30° a +230° C
DUREZZA DISPONIBILE:
Da 55 a 95 Sh A
APPREZZABILITA’:
Eccellente resistenza a temperature estreme, eccellente resistenza agli agenti chimici, solventi, acidi.
SVANTAGGI:
Non flessibile a basse temperature. Non utilizzabile in acqua calda
CAMPI D’IMPIEGO:
Resistenti alla maggior parte di agenti chimici, acidi e benzine.

Natural Rubber

CODE:
NR
COMMERCIAL NAME:
Natural Rubber
OPERATING TEMPERATURES:
-60° to + 80° C
AVAILABLE HARDNESS:
25 to 90 Sh A
APPRECIATION:
Excellent resistance to compression, excellent elasticity, fair resistance to abrasion, good friction capacity.
DISADVANTAGES:
Not resistant to oils and UV radiations
FIELDS OF USE:
All products requiring exceptional elastic qualities

Styrene-butadiene rubber

CODE:
SBR
COMMERCIAL NAME:
Styrene rubber
OPERATING TEMPERATURES:
-35° to + 80° C
AVAILABLE HARDNESS:
40 to 90 Sh A
APPRECIATION:
Good resistance to the water and to the braking system fluids used in the automotive industry
DISADVANTAGES:
Poor resistance to oils, UV radiations, water and weather agents.
FIELDS OF USE:
Tires, seals for braking systems

Nitrile rubber

CODE:
NBR
COMMERCIAL NAME:
Nitrile or oil-proof rubber
OPERATING TEMPERATURES:
-40° to + +110° C
AVAILABLE HARDNESS:
30 to 90 Sh A
APPRECIATION:
Excellent resistance to compression, tearing and abrasion.
DISADVANTAGES:
Limited resistance to heat; suffers weathering.
FIELDS OF USE:
All uses where resistance to oils is required, automotive industry.

Hydrogenated nitrile butadiene rubber

CODE:
HNBR
COMMERCIAL NAME:
Hydrogenated nitrile rubber
OPERATING TEMPERATURES:
-35° to + +130° C
AVAILABLE HARDNESS:
30 to 90 Sh A
APPRECIATION:
Excellent resistance to compression, tearing and abrasion, resistance to temperatures greater than that of NBR
DISADVANTAGES:
Limited resistance to heat; suffers weathering.
FIELDS OF USE:
All uses where resistance to oils is required, automotive industry.

Polychloroprene

CODE:
CR
COMMERCIAL NAME:
Neoprene®
OPERATING TEMPERATURES:
-20° to + +95° C
AVAILABLE HARDNESS:
30 to 90 Sh A
APPRECIATION:
Excellent resistance to ammonia, fair resistance to oils, good resistance to weather agents.
DISADVANTAGES:
Not compatible with solvents.
FIELDS OF USE:
Widely used in the scuba diving industry for wet suits.

Ethylene propylene diene monomer

CODE:
EPDM
COMMERCIAL NAME:
Dutral Ter
OPERATING TEMPERATURES:
-45° to + +140° C
AVAILABLE HARDNESS:
40 to 90 Sh A
APPRECIATION:
Excellent resistance to weather agents, good elasticity even at low temperatures; it can withstand relatively high temperatures and most of the commonly used chemical agents.
DISADVANTAGES:
No resistance to acids, solvents and petroleum oils.
FIELDS OF USE:
This elastomer is one of the most commonly used, because of its good cost/quality ratio. Available in food grade version.

Polydimethylsiloxane/Liquid Silicone Rubber

COMMERCIAL NAME:
Silicone
OPERATING TEMPERATURES:
-60° to + +220° C
AVAILABLE HARDNESS:
20 to 85 Sh A
APPRECIATION:
Excellent resistance to extreme temperatures, good resistance to compression and water; hygiene, food and medical.
DISADVANTAGES:
Limited elasticity.
FIELDS OF USE:
The silicone is used for multiple uses, in the medical, food, hygiene industry, and wherever an excellent resistance to extreme temperatures is required.

Fluoro-elastomer (Hexafluoropropylene – vinylidenefluoride)

CODE:
FKM/FPM
COMMERCIAL NAME:
Viton®, Tecnoflon®
OPERATING TEMPERATURES:
-30° to + +230° C
AVAILABLE HARDNESS:
55 to 95 Sh A
APPRECIATION:
Excellent resistance to extreme temperatures, excellent resistance to chemical agents, solvents and acids.
DISADVANTAGES:
Not flexible at low temperatures. It cannot be used in hot water.
FIELDS OF USE:
Resistant to most chemical agents, acids and petrols.