FERMASIL

Two-component, room-temperature cross-linking silicone systems for sealing, gluing and potting

Tailor-made chemistry for the most demanding requirements.

FERMASIL® is the trade name for the two component silicone  system from Sonderhoff Chemicals for manufacturing of fl exible silicone elastomers and silicone foam sealings,  which are applied directly onto the
part by using FIPFG (formed-in-place foam gasket)  technology.

The systems consist of an A-component and a crosslinking B-component, which are processed in a given mixing ratio. After mixing the components most systems react by their own at room temperature and generate
a soft and fl exible silicone foam sealing or permanently flexible silicone elastomers.

FERMASIL® systems are processed using 2- component low pressure mixing and dosing machines. Suited for the mixture are dynamic mixing systems as well as static mixers. Sonderhoff recommends dynamic mixing systems for material friendly processing.

Sonderhoff FERMASIL® Systems can be used by a constant temperature from -60°C to +180°C and temporary up to +350°C but they keep always their softness and flexibility. Due to their closed cell structure they
do not absorb water and are suitable for the use in tropic  or damp rooms. They are also highly resistant to other chemicals (e.g. cleaning agents, alcohols, lubricants, hydrochloric acid, nitric acid, brake fl uids, cooling agents and ammonia gases).

 

2D application on a level surface

2D application in a groove

3D application on a surface

3D application in a groove

Thixotropic (pasty) sealing systems are preferentially used which, depending on the degree of viscosity, form a seal body with a height/width ratio from 1 : 2,5 to 1 : 1,5.

Fluid sealing systems, which are self-levelling over joints, are usually used in this case. This allows smooth seamless seals to be created.

Thixotropic (pasty) sealing systems are preferentially used which, depending on the degree of viscosity, form a seal body with a height/width ratio from 1 : 2,5 to 1 : 1,5. Use is possible even with extreme slopes up to vertical application.

Thixotropic (pasty) sealing systems are used most often in this case. Seal application is also possible even with extreme slopes.

 

10 good reasons for using FERMASIL® :

  1. FERMASIL® systems can be used by a constant temperature up to +180°C (special types up to 250°C)
    and temporary up to +350°C.
  2. FERMASIL® systems is closed-cell and therefore do not absorb water.
  3. FERMASIL® systems are highly resistant to many chemicals.
  4. FERMASIL® systems are hydrolysis stable and therefore suitable for the use in tropic or damp rooms.
  5. FERMASIL® systems keep greatest possible fl exibility even down to -60°C.
  6. FERMASIL® systems are tack free in 2 - 30 minutes which depends on the thermal condition. An oven can reduce the reaction time considerably, but it is not a necessity in all cases.
  7. FERMASIL® systems are processed using two component metering units and can be adapted anytime flexibly and quickly to other components to be sealed.
  8. FERMASIL® systems develop a cross-linked structure which is extremely resistant to environmental effects such as humidity, dust and temperature.
  9. FERMASIL® systems possess exceptional long-term behaviour and have almost 100% resetting ability, even after many years of continual use.
  10. FERMASIL® systems are suitable for direct contact with food in some cases.

FERMASIL® - The technology

The reaction of FERMASIL® foam sealants is initiated by mixing the A and B components. This results in a chemical reaction which proceeds steadily at room temperature. The applied mass foams equally in all dimensions to form the gasket.

 

FERMASIL® - The foaming process

  • Mixing time: the time period in which the A and B components are mixed.
  • Reaction time: the time period in which the FERMASIL® foam system begins to react
    (after approx. 15 - 60 seconds *)
  • Rise time: the time period in which the FERMASIL® foam system expands to form the seal body (after
    approx. 60 - 180 seconds *)
  • Tack-free time: the time after which the seal surface of FERMASIL® foam systems is tack free at room
    temperature and can be touched without causing damage (after approx. 2 - 30 minutes *)
    oder im Ofen klebfrei ist und ohne Beschädigung berührt werden kann (nach ca. 2 – 30 Min.*)
  • Assembly time: is the time point after which FERMASIL® foam systems can bear loads or the sealed components
    can be assembled (after approx. 20 minutes - 12 hours *)

* depends on the temperature conditions

Processing informations

FERMASIL® silicone systems are processed using two component mixing and metering machines. The recommended processing temperature is +23 +– 5 °C. Most of the FERMASIL® components can be stored in the original packaging and for at least 6 months.

PHYSICAL AND CHEMICAL PROPERTIES

Eigenschaft

FERMASIL®

Appearance

white, grey or black, other colours upon request (also transparent)

Hardness:

gel-like up to 80 Shore A feasible

Compression load defl ection

20 to 150 kPa (at 25% compression)

Density

from 0,3 g/cm³ to 2 g/cm³

Temperature resistance

from –60° C to +180° C (short time up to +350° C)

Tensile strength

up to 4,5 MPa [N/cm²]

Elongation at break

up to 600 %

Compression set

> 97 % (depending on test conditions)

Water absorption

< 1 %

Flame retardancy

up to UL-94 V-0 possible

Viskosity of the A component

from 1.000 mPas (liquid) to 500.000 mPas (highly pasty)

Other properties

UL50 conformity, UV resistant, low fogging, good chemical resistance, if requested IP 69K ingress protection class and Nema 4-6p protection class are possible.
Customized developments can be agreed any time on request.

The FERMASIL® range

Designation

Application

Viscosity

Hardness

Density
g/cm³

Other properties

2C addition curing

1809-1

Automotive
Distance sensors

8.500

70
(Shore 00)

0,70

Slightly foamed, liquid silicone system,
particularly suitable for ultrasonic sensores – good ratio between resonance and absorption behaviour

65C4-1

Automotive
Drive belt covers

> 100.000

70
(Shore 00

0,35

Highly viscous, stable, medium hardness, curing possible without heat treatment

5020-1

Lighting
Linear luminaires, e-boxes, packaging, electric enclosures

ca. 15.000

50
(Shore 00

0,30

Liquid, good fl ow, curing possible without heat
treatment, lights with Atex approval

4010E-1

Electronics
Potting of electronics, battery packs, potting of sensors, potting of PC boards

5.000

50
(Shore A)

1,00

very good dielectric properties, good fl ow rating, color and reactivity are adaptable to costumers’ wishes, by changing the mixing ratio also able to process gel-like.

2515E-1

Packaging
Packaging covers in contact with
food, Food-Boxen

> 10.000

20
(Shore A)

1,10

Soft elastomer seal with good mechanical properties

5515E-1-G

Packaging
Food-Boxes, packaging
covers in contact with
food

ca. 10.000

25-55
(Shore A)

1,25

Use in contact with food is possible, fast curing, good mechanical properties

6505-1

Electric enclosures
E-boxes, electric enclosures,
ultrasonic sensors

ca. 10.000

60
(Shore 00)

0,40

Liquid, PTB approved in electric enclosure applications

60C0-1

Electric enclosures
Electric enclosures

> 100.000

60
(Shore 00)

0,35

Thixotropic, stable, standard material with medium hardness, UL50E listed

6590-1-G

Electric enclosures
Electric enclosures with
ATEX approval

> 100.000

60
(Shore 00)

0,35

UL50E listed, thixotropic, stable, curing possible without heat treatment

2C condensation curing

FERMASIL®  166

Household
ceramic glass sealings,
splash guard in the engine

> 60.000

25
(Shore 00)

0,45

alkoxy cross linking, no corrosive fi ssion products while curing, very soft foam seal

 

 

product brochure

Appliances

FERMASIL® in automotive parts

FERMASIL® in lighting products

FERMASIL® in electrical enclosures

FERMASIL® in filters