precote 85
| High Strength Thread Precoating with Controlled Torque/Tension
Description
precote 85 is a varnish-like precoating system on base of micro encapsulated epoxy-acrylate for sealing and locking of threaded parts. The dried film is tack-free, solvent free and physiologically harmless. Its characteristics as a locking and sealing element become effective only when the capsules are ruptured by shear and/or pressure stress and the adhesive is allowed to cure. | Application
On high-stressed threaded combinations with controlled friction which require a high locking effect. The product can be applied on screws, studs and no standardized parts as well as on thread plugs and pipe threads. After curing the connection exhibits a high break-away torque, without compromising the disassembly by a high prevail off torque. The required strength acc. DIN 267 part 27 is achieved within 6 hours at room temperature. No uncontrolled post curing occurs even after repeated temperature exposure. For threads ≤ M6 or 1mm pitch we recommend precote 85-8. |
Properties
- Forms a dry and tack-free film.
- Unlosable part of the thread.
- Physiologically harmless as coating and as assembly.
- Threaded parts can be preapplied long time before assembly(oT coating machine).
- Seals against pressure up to 400 bar (5760 psi).
- Retains torque performance even at +170°C.
- Prevents corrosion in the threaded connection.
- Fast curing - no post curing even after repeated temperatureexposure.
- Low thread friction.
- Good chemical resistance (meets the relevant automotive specifications).
- Complies with DIN 267, part 27.
SPECIFICATION:
| Colour: |
turquoise |
| Thread friction value* μthread |
0.10 - 0.15 |
Curing time*
(to achieve the values acc. DIN 267 part 27)
|
( RT ) 6 h
|
| Prevailing-in torque PIT on assembly* |
0.5 - 0.9 Nm |
Strength without preload BAT*
oT-standard 2.7.1** resp. DIN 267, part 27
|
min. 20 Nm |
Strength ratio BLT/MAa*
oT-standard 2.7.3** resp. DIN 267, part 27
| > 1.2
|
| Prevailing-out torque POT |
< DIN 267part 27 |
| Temperature range |
-50°C to +170°C |
Remaining strength after heat aging
(2,000 h at +200°C) |
100 %
|
| Shelf-life |
4 years at room temperature |
|
27/65 DIN 50 014 |
|
|
*All values apply to screws M10 ISO 4017-8.8 plain finish and nuts M10 ISO 4032-10 plain finish comply with DIN 267, part 27.
**oT-standards available on request. |
 
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