Application

Automotive and rail

Hard, repellent and thin enough for plastic

The situation

Interior and exterior trim, pillars, grilles, badges, wheels, window frames and rail components in PC/ABS, PA, painted metal or aluminium, where the surface has to resist keys, cleaning agents and ultraviolet light without an oven.

What fails today

Hard coats on plastic craze when the film is thicker than the primer can carry.
A film that cures too fast traps solvent and blisters in a warm interior.
Water repellency that comes from an additive rather than the backbone washes off in the first cleaning cycle.
Films that pass the lab panel fail in the field because the panel was not the moulded part.

Grades for this duty

SF-CB003

Methylhydro, no aminosilane: needs an oven, co-reacts with other resins

15–45 cSt @ 25 °C 7H

SF-RC001

Aminosilane-modified, 7–8H, wipes on and cures in air

15–45 cSt @ 25 °C 7–8H

SF-RC002

The hardest room-temperature grade: 8–9H, tack-free in minutes when warm

85–155 cSt @ 25 °C 8–9H

SF-RC004

Lowest viscosity in the range, 50–60 % solids, room-temperature cure

6–15 cSt @ 25 °C 7–8H

SF-RC007

The flexible one: 4–5H for plastics and wind blades

10–45 cSt @ 25 °C 4–5H

SF-RC150

Low viscosity, room-temperature cure, 110° contact angle

35–55 cSt @ 25 °C 6–7H

SF-SC002

Slow cure and a long open time, 7–8H at the end

15–55 cSt @ 25 °C 7–8H

SF-SC150

Longer open time, the same 107° surface

35–55 cSt @ 25 °C 6H

How to apply it

Clean and activate the substrate; on polyolefins a primer or a surface activation step is usually needed.

Thin film, 4–6 µm; a heavy coat cracks as it cures.

Cure at room temperature for parts that cannot be heated, or accelerate with warm air where the part allows.

Handle after tack-free, pack only after the full cure: the film is still reactive for days.

How to qualify it

Scratch resistance by pencil hardness to ISO 15184 (GB/T 6739) on the same plastic the part is moulded from, with the film thickness recorded.
Adhesion by cross-cut to ISO 2409 or ASTM D3359, before and after an ageing cycle.
Contact angle to ASTM D7334 with a fixed drop volume and a fixed reading time.
Ageing under xenon arc to ISO 16474-2 or ASTM G155: a result from a QUV lamp is not comparable.
Abrasion and chemical resistance against the fluids the part actually meets.

Bring your substrate and your target; we quote a grade and a cure schedule against it.

Next step

Tell us the substrate and the duty

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