Cryofton-1(SKF 260V) is a heat and corrosion resistant fluoro-hydrogen rubber.
Its products are serviceable within (-35 ÷ +250)oC.
The rubber compounds show a better processibility and can process on the conventional machinery of rubber industry by compression, extrusion, calandering and injection molding to give various articles, complex-shaped ones included.
Formulation of test rubber compound
| Ingredients | Mass, g |
|---|---|
| Raw rubber | 100.0 |
| Calcium hydroxide | 4 |
| Dicumyl peroxide (PDC) | 2 |
| Triallyl isocyanurate (TAIC) | 2 |
| Carbon black T900 | 30 |
Sequence of ingredient addition
Compounding is run in rubber internal mixers or on roll mills at roll temperature 20oC – 30oC.
<th">Addition start-up, min
| NN | Ingredients | Mixing time, min | |
|---|---|---|---|
| 1 | Raw rubber | 0 | 2 |
| 2 | Calcium hydroxide | 2 | 2 |
| 3 | 1/3 T-900+1/3 TAIC+1/3PDC | 4 | 2 |
| 4 | 1/3 T-900+1/3 TAIC+1/3 PDC | 6 | 2 |
| 5 | 1/3 T-900+1/3 TAIC+1/3 PDC | 8 | 4 |
| 6 | Blending (milling) | 12 | 3 |
Mill over 8 minutes
Extrusion
Blanks for sealing rings are made on screw extruders under the below conditions:
- head temperature 100 – 110oC,
- screw speed 10 – 20 r/min
Cure conditions
Cure is performed in two steps:
- 1st step – press: 30 min at 160oC,
- 2nd step – oven: 24 hrs at 250oC.
Vulcanizate characteristics
| Indices | Values |
| Tensile strength, MPa, min | 8.0 |
| Elongation at break, %, min | 150 |
| Compression set after 20% compression, 24hrs, 200oC, max | 40 |
| Shore A hardness, min | 40 |
| Cold resistance by elastic recovery upon 20% compression at T = -30oC, min at T = -25oC, min |
Chemical resistance of vulcanizates
| Medium | Exposure conditions | Swell, % mass | |
| Temperature,oC | Time, hrs | ||
| Solvent | |||
| Carbon disulfide | 25 | 168 | 3 |
| Ethanol | 25 | 168 | 2 |
| Trichloroethylene | 25 | 168 | 6 |
| Oil, fuel | |||
| Lubricants for aircraft engines (Xenon NET025) | 204 | 168 | 8 |
| Lubricants for vehicle engines 10W-30 | 150 | 72 | 3 |
| Antifreeze | 115 | 336 | 3 |
Notes:
Common applications:
- airspace industry - (sealing parts for fuel and hydraulic systems of engines );
- packaging – PE bags in wooden (polymer) boxes,
- marking - handling symbols - “Keep dry”, “Temperature Limits (-40 ÷+35)oC ;
- transportation – all covered transportation means;
- storage – keep in dry heated rooms at not higher than 35oC. Protect from soiling and direct sunlight.
Safety:
1. Raw rubber is a hardly combustible material. Has nor skin resorptive, neither allergenic effects.
2. Working areas must have ventilation systems at all the steps of rubber compound preparation. Personal protection means – goggles, clothing, respirator, gloves.
3. Wastes must be burned at special plants only. Other ways of disposal include burying, chemical modification to generate low-molecular polymers.
4. Use carbon black as filler.
FSUE NIISK: Russia, St.- Petersburg, Gapsalskaya st., 1.
Tel. +7 812 372-64-90, ext. 1324
Dr. Gubanov V.A.
- Trade name
- Cryofton-1 (SKF-260V)
- Specifications
Indices Values Appearance light-to-dark yellow crumbs Mooney viscosity MB (1-10), 100oC 55-90 Fluorine content, % mass 64 Mass loss, 3 hrs, 300oC, %, max 2.0 Mass loss, 24 hrs, 120oC, %, max 0.5 Glass transition temperature by thermomechanical methd, 0C -38