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The Rhopoint IQ Gloss, Haze & DOI Meter quantifies surface quality problems that are invisible to a standard glossmeter and profiles how light is reflected from a surface.
Glossmeters are usually used to measure the “shininess” of a surface but are not sensitive to common effects which reduce appearance quality.
IQ GLOSS measurements are fully compatible with existing Novo-Gloss and Micro-TRI-gloss results.
Dualgloss 20/60° or Trigloss 20/60/85° versions are for maximum accuracy and resolution in all gloss applications.
A measurement proportional to the amount of light reflected from a surface.
Geometry: The correct measurement geometry should be used according to the sample finish – matt: 85°, mid gloss: 60°, high gloss: 20°
The peak gloss measured over a very narrow angle.
Usage: It is very sensitive to surface texture and can be used to identify subtle differences in smooth surfaces.
A measure of how clearly a reflected image will appear in a reflective surface.
Orange peel dramatically reduces appearance quality without affecting gloss readings. These two test panels measure identically with a standard glossmeter. The Rhopoint IQ with RIQ/DOI measurement can quantify the differences.
RIQ is used to quantify effects such as orange peel and surface waviness. This new parameter gives higher resolution results compared to Distinctness of Image (DOI) measurement and better mimics human perception of surface texture, especially on high quality finishes such as automotive.
Symptoms of poor RIQ: Orange peel, brush marks, waviness or other structures visible on the surface. Reflected images are distorted.
Causes: Application problems, incorrect coating flow, coating viscosity too high/low, sag or flow of coating before curing, incorrect particle size/distribution, overspray, improper flash/ recoat time, inter-coat compatibility, incorrect cure times and cure temperature.
An optical effect caused by microscopic texture or residue on a surface.
Visible symptoms: A milky finish is apparent on the surface with a loss of reflected contrast. Halos and patterns can be seen around reflections of high intensity light sources.
Causes: Poor dispersion, raw material incompatibility, additive migration, vehicle quality, stoving/drying/
curing conditions, polishing marks, fine scratches, ageing, oxidisation, poor cleanliness/surface residue.
The instrument compensates for reflection from within the coating for highly reflective pigments, metallic coatings and speciality pigments, allowing the haze of any painted surface to be measured.
Gloss has been defined as ‘The attribute of surfaces that causes them to have shiny or lustrous, metallic appearance.’
Manufacturers design their products to have maximum appeal: from highly reflective car body panels to glossy household appliances or matt finish automotive interior trim.
This is especially noticeable where parts may be produced by different manufacturers or factories but will be placed adjacent to one another to create the finished product.
Gloss can also be a measure of the quality of the surface, for instance a drop in the gloss of a coated surface may indicate problems with its cure, leading to other failures such as poor adhesion or lack of protection for the coated surface.
The gloss of a surface can be greatly influenced by a number of factors, for example the smoothness achieved during polishing, the amount and type of coating applied or the quality of the substrate.
It is for these reasons that many manufacturing industries monitor the gloss of their products, from cars, printing and furniture to food, pharmaceuticals and consumer electronics.
It is important therefore that gloss levels are achieved consistently on every product or across different batches of products.
ISO 2813 and ASTM D523 (the most commonly used standards) describe three measurement angles to measure gloss across all surfaces.
Gloss is measured in gloss units (GU) and is traceable to reference standards held at NIST (USA).
All gloss levels can be measured using the standard measurement angle of 60°. This is used as the reference angle with the complimentary angles of 85° and 20° often used for low and high gloss levels respectively.
For improved resolution of low gloss a grazing angle of 85° is used to measure the surface. This angle is recommended for surfaces which measure less than 10GU when measured at 60°.
This angle also has a larger measurement spot which will average out differences in the gloss of textured or slightly uneven surfaces.
The acute measurement angle of 20° gives improved resolution for high gloss surfaces. Surfaces that measure 70GU and above at the standard angle of 60° are often measured with this geometry.
The 20° angle is more sensitive to haze effects that affect the appearance of a surface.
This measuring angle is in accordance with the ISO 2457 standard for the gloss measurement of plastic films and solid plastic parts as well as according to the standard ASTM C346 for the gloss measurement of ceramics
All gloss levels can be measured using the standard measurement angle of 60°. This is used as the reference angle with the complimentary angles of 85° and 20° often used for low and high gloss levels respectively.
For improved resolution of low gloss a grazing angle of 85° is used to measure the surface. This angle is recommended for surfaces which measure less than 10GU when measured at 60°.
This angle also has a larger measurement spot which will average out differences in the gloss of textured or slightly uneven surfaces.
The acute measurement angle of 20° gives improved resolution for high gloss surfaces. Surfaces that measure 70GU and above at the standard angle of 60° are often measured with this geometry.
The 20° angle is more sensitive to haze effects that affect the appearance of a surface.
To quantify haze, distinctness of image, reflected image quality and other surface texturing please consider the Rhopoint IQ.
In the coatings industry, this microscopic surface texture is often due to poorly dispersed raw materials, incompatible raw materials or oxidisation and weathering. For polished metal surfaces, haze is often associated with polishing marks or chemical residue.
Haze is light that has been reflected by small surface structures adjacent to the main specular component.
Reflectance haze – An optical effect caused by microscopic texture or residue on a surface.
Reflection haze is an optical phenomenon usually associated with high gloss surfaces.
It is a common surface fault that reduces appearance quality. A hazy surface has a visibly shallower reflection with a milky finish and halos appear around reflections of strong light sources.
No Haze, deep reflection
High Haze, ‘shallow’ finish
A high gloss finish with haze exhibits a milky finish with low reflective contrast, reflected highlights and lowlights are less pronounced.
Low Haze
Higher Haze
On surfaces with haze, halos are visible around the reflections of strong light sources.
The IQ Flex 20 uses a 512 element linear diode array which profiles reflected light in a large arc from 14° to 27°. The instrument processes this high resolution data, selecting individual elements within the array that equate to the angular tolerences outlined in international measurement standards.
A major advantage of the IQ Flex 20 is that it automatically compensates for curved or textured sample surfaces by virtually adjusting the measurement position. Conventional gloss- hazemeters have fixed optics which can make measurement unreliable as any sample curvature will reflect light away from the centre of the measurement sensor causing errors.
The IQ Flex 20 automatically adjusts the sensor position by detecting the peak of the reflected light. The laws of reflection state that the incident angle is equal to the reflection angle thus the peak equates exactly to the 20° gloss angle.
Reflection haze is caused by micro texture on a surface which causes a small amount of light to be reflected adjacent to the gloss angle.
For white surfaces, bright colours and metallics, a certain amount of diffuse light, reflected from within the material, is also present in this region.
This diffuse light exaggerates the haze signal for these surfaces causing higher than expected readings.
* Only enabled when the instruments is set to haze measuring mode of ASTM E430
For non metallic surfaces, the diffuse component is Lambertian: it is equal in amplitude at all angles in relation to the sample surface. Conventional gloss-hazemeters measure diffuse reflection using a luminosity sensor positioned away from the gloss angle. Luminosity is subtracted from the haze signal allowing metallic surfaces to be measured independently of their colour.
An advantage of the IQ Flex 20 is that unlike a conventional instrument, compensation is calculated using a region adjacent to the haze angle. This technique gives compatible readings on solid colours but also compensates for directional reflection from metallic coatings and speciality pigments.
The Rhopoint IQ Flex 20 quantifies surface quality problems that are invisible to a standard glossmeter.
RIQ is used to quantify effects such as orange peel and surface waviness. This new parameter gives higher resolution results compared to Distinctness of Image (DOI) measurement and better mimics human perception of surface texture, especially on high quality finishes.
Symptoms of Poor RIQ: Orange peel, brush marks, waviness or other structures visible on the surface. Reflected images are distorted.
Causes: Application problems, incorrect coating flow, coating viscosity too high/low, sag or flow of coating before curing, incorrect particle size/distribution, overspray, improper flash/re-coat time, inter coat compatibility, incorrect cure times or cure temperature.
The instrument compensates for reflection from within the coating for highly reflective pigments, metallic coatings and speciality pigments, allowing the haze of any painted surface to be measured.
A measure of how clearly a reflected image will appear in a reflective surface.
An optical effect caused by microscopic texture or residue on a surface.
Visible Symptoms: A milky finish is apparent on the surface with a loss of reflected contrast. Halos and patterns can be seen around reflections of high intensity light sources.
Causes: Poor dispersion, raw material incompatibility, additive migration, vehicle quality, stoving/drying/ curing conditions, polishing marks, fine scratches, ageing, oxidisation or poor cleanliness/surface residue.
Haze is a common problem associated with coatings and polished materials. Surfaces with haze have a milky finish with a shallow reflected image. This important characteristic is directly measured with the Rhopoint IQ Flex 20.
Fast measurement of all parameters and instantly transmit measured readings.
Simultaneous measurement of all parameters, date and time stamped.
Displays full statistics for the number of readings in the current batch.
Graphical reporting for quick trend analysis.
Pass / Fail parameters can be defined for instant identification of nonconformances.
Different types of surface textures produce identifiably shaped reflectance profile. This goniophotometric data can be downloaded to a PC for further analysis and comparison via the USB cable or Bluetooth data widget.
View and inspect data saved on the instrument.
USB connection to PC instantly recognises the device as a drive location which facilitates the quick transfer of .csv files using Windows Explorer or similar.
Instantly transmit measured readings directly to programs such as MS Excel on your PC / tablet to greatly simplify the reporting process.
The included software provides an easy means to measure, import and compare data and export the measurements into several other file formats, e.g. PDF, Excel® or CSV.
The DOI, Haze and RSPEC values measured by the Rhopoint IQ allow the user to quantify and control the surface textures that reduce the perceived quality of manufactured products.
The meter is widely used throughout many industries to assess the reflective qualities of products, in particular automotive exteriors and interiors.
| 20° Gloss | ||||
|---|---|---|---|---|
| Range | 0 - 100 GU | 100 - 2000 GU | ||
| Repeatability | 0.2 GU | 0.2% | ||
| Reproducibility | 0.5 GU | 0.5% * | ||
| Resolution | 0.1 GU | |||
| Measurement Area | 6mm x 6.4mm | |||
| Standards | ISO 2813 | ASTM D523 | ISO 7668 | ASTM D2457 | DIN 67530 | JIS Z 8741 | |||
| 60° Gloss | ||||||
|---|---|---|---|---|---|---|
| Range | 0 - 10 GU | 10 - 100 GU | 100 - 1000 GU | |||
| Repeatability | 0.1 GU | 0.2 GU | 0.2% | |||
| Reproducibility | 0.2 GU | 0.5 GU | 0.5% * | |||
| Resolution | 0.1 GU | |||||
| Measurement Area | 6mm x 12mm | |||||
| Standards | ISO 2813 | ASTM D523 | ISO 7668 | ASTM D2457 | DIN 67530 | JIS Z 8741 | |||||
| 85° Gloss | ||||
|---|---|---|---|---|
| Range | 0 - 100 GU | 100 - 199 GU | ||
| Repeatability | 0.2 GU | 0.2% | ||
| Reproducibility | 0.5 GU | 0.5% * | ||
| Resolution | 0.1 GU | |||
| Measurement Area | 4.4mm x 44mm | |||
| Standards | ISO 2813 | ASTM D523 | ISO 7668 | ASTM D2457 | DIN 67530 | JIS Z 8741 | |||
| Haze | ||
|---|---|---|
| Range | 0 - 500 Log HU | |
| Repeatability | 1 Log HU | |
| Reproducibility | 10 Log HU | |
| Resolution | 0.1 Log HU | |
| Measurement Area | 6mm x 6.4mm | |
| Standards | ASTM E430 | ASTM D4039 | ISO 13803 | |
| RSpec | DOI | RIQ | |||
|---|---|---|---|---|---|
| Range | 0 - 2000 GU | 0 - 100 GU | 0 - 100 GU | ||
| Repeatability | 0.2% | 0.2 Log HU | 0.2 Log HU | ||
| Reproducibility | 0.5% | 0.5 Log HU | 0.5 Log HU | ||
| Resolution | 0.1 | ||||
| Measurement Area | 6mm x 6.4mm | ||||
| Standards | Rhopoint | ASTM E430 | Rhopoint | ||
| Instrument Information | ||
|---|---|---|
| Battery Type | Rechargeable lithium ion | |
| Operation Time | 17+ hours | |
| Readings per Charge | 20,000+ | |
| Memory | 8MB, 2,000 readings | |
| Operating Temperature | 15°C - 40°C (60°F - 104°F) | |
| Operating Humidty | Up to 85% (non condensing) | |
| Commodity Code | 9027 5000 | |
