OTM participated in a proficiency testing (PT) program recently, with satisfactory results. A PT program is for test quality evaluation of laboratories. Typically, samples with known results are distributed by the PT organizer to a group of participating laboratories. The results tested by the laboratories are compared by the PT organizer to evaluate the test quality of each laboratory.
Below is a summary of the PT program on thermal conductivity testing and the performance of OTM in this program:
Number of participating laboratories: 84
Test type: insulation material thermal conductivity test
Sample: polystyrene board, at 25 °C mean temperature
Average results from all laboratories: 0.0344 W/(m⋅K)
Result tested by OTM: 0.0344 W/(m⋅K), with Z-score = 0
There are also scenarios that transparent/translucent materials are with standalone installations and without substrates, .e.g. canopies made of fabric materials. In such cases, it is sometimes necessary to determine the solar absorptance and thermal emittance of transparent/translucent materials.
Solar absorptance of transparent/translucent materials
According to ASTM E903, the solar absorptance of a transparent/translucent material can be calculated as:
Solar absorptance = 1 – solar transmittance – solar reflectance
Thermal emittance of transparent/translucent materials
It is out of the scope of ASTM C1371 to measure the thermal emittance of a transparent/translucent material. A manufacturer’s technical note is available to measure the IR transmittance and thermal emittance of transparent/translucent materials, with a portable emissometer.
SRI of transparent/translucent materials
It is out of the scope of ASTM E1980 to determine the solar reflectance index (SRI) of transparent/translucent materials. As suggested by its title, ASTM E1980 is for “horizontal and low-slope opaque surfaces”.
According to BCA’s requirements on daylight reflectance, there are different requirements for the following installation locations:
Low-sloped roof, with less than 20 degrees of inclination angle from the horizontal plane
High-sloped roof, with more than 20 degrees of inclination angle from the horizontal pane
We were asked by many customers if we test the daylight reflectance at different inclination angles, in order to meet BCA’s requirements.
The short answer is: no, we do not test the daylight reflectance at different inclination angles.
Daylight reflectance, as a material property, is independent of its inclination angle. The angle in BCA’s requirement is the installation angle, it does not mean that daylight reflectance needs to be tested at various inclination angles.
Daylight reflectance is a material property and it does not change with its inclination angle.
For example, for a surface with 10% of total daylight reflectance, its total daylight reflectance remains 10%, when the surface is tilted.
The test angle in the laboratory is dependent on the test instrument design and it is different from the installation angle in a building project.
We are looking for a sales executive for better sales flow and customer experience.
OTM Solutions Pte Ltd was founded in 2013, with the following two operations:
Optical & thermal testing laboratory: we provide third-party material testing services to the building & construction industry (e.g. architectural glass optical properties, insulation material thermal conductivity). Our lab is SAC-SINGLAS accredited and with customers from more than 20 countries.
Instrumentation services: we are also the distributor of a well-established instrument manufacturer. We supply measurement instruments (e.g. weather stations and data loggers) and provide integration and measurement services.
For more details, please visit our website: www.otm.sg
We are looking for a sales executive, with the following duties:
Pre-sales enquiries: communicate with customers on service/product specifications. Technical knowledge on our services/products is required. Training will be provided.
Official sales documents: generate official documents (e.g. quotation, tax invoice, delivery order) required in a typical sales cycle.
Post-sales coordination: communicate with customers on job progress and other customer enquiries (e.g. customer feedback and satisfaction survey).
Sales records: maintain sales related records in the Customer Relationship Management (CRM) system and other relevant tools (e.g. customer loyalty program, sales records).
Quality document management: help laboratory manager maintain quality documents (i.e. standard operating procedures, SOPs) and attend quality audits. Training will be provided.
Education: diploma or degree is preferred
Language skills: proficient in English (both oral and written) is essential, most communications with customers will be over phone and emails
Computer skills: emailing with MS outlook, document editing with MS Word & Excel, quoting and invoicing with software (training will be provided)
Professional working and learning attitude: able to learn and comprehend our service/product specifications, able to comply with company requirements
Good inter-personal skills and responsive
Willingness in working in a small size company
Able to work in Woodlands area
We welcome fresh graduates to apply
Fixed basic salary with sales incentives and performance bonus
Short office hours (Monday to Friday, 9am – 4pm)
14 days of annual leave
How to apply
Please email your CV and cover letter to email@example.com. If you are shortlisted, we will contact you within 1 week.
We are pleased to introduce our online luminance contrast calculator (V1.0.0, first version). Click the screenshot below to access this online calculator.
The calculation principle of this calculator is similar to the online total daylight calculator. The luminous reflectances of the two sRGB colors selected are calculated with color space conversion. The luminance contrast is then calculated from the two luminous reflectance results.