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Models made with VeroClear (RGD810) have a slight yellow tint when
removed from the printer. This is especially true for models printed with a
glossy finish. The yellow tint fades naturally over time, but you can greatly
accelerate this process by using a suitable photobleaching treatment.
As a rule, best clarity is achieved when parts are printed with a matte finish,
and treated as explained below.
Photobleaching models involves exposing them to light. To achieve highly
controlled and predictable results, a professional illumination chamber is
recommended. However, adequate results may be obtained using ordinary
desk lamps fitted with suitable fluorescent elements.
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Follow these instructions for photobleaching printed models.
• The fluorescent lamps should be rated 45W, 6500K.
• When using desk lamps, place the models in a container lined with
aluminum foil. Use at least two lamps, more when treating models in a
large container.
• Arrange the models with enough space between them to allow light to
reach all sides of each model.
• Verify that the ambient temperature around the models is approximately
40°C (104°F). Higher temperatures may cause model distortion; lower
temperatures may not produce satisfactory results. When using desk
lamps, you can achieve the required temperature by positioning the lamps
approximately 10 cm (4 in.) above the models.
• Inspect the models after six hours of treatment.
❒
For parts with a matte finish, this should be enough. Polish and
lacquer the parts.
❒
For parts with a glossy finish, continue the photobleaching treatment
for up to 18 hours more.
In Stratasys laboratories, there was a tint reduction of approximately 70%
within six hours. After 24 hours, tint was reduced by approximately 90%.
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