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| EMC Shielded Windows | Material Properties |
Prism 'a' Half weight of glass Bright surface transmission Resistance to pitting from hot sparks High refractive index High impact strength Resistant to acid, alkaline and solvents |
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Most of our shielded windows are cast on site using Prism 'a' with a micro-fine stainless steel or copper mesh encapsulated within, forming a one-piece window. We also cast with acrylics where many colours are available.
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| Prism 'a' is a highly scratch resistant material made from Allyl Diglycol Carbonate and offers a high im pact strength, bright surface transmission with a refractive index only slightly lower than crown glass. | |||
| Back | Shielding Methods and results | Enquiry Form |
Typical Properties of Polymers used in Prism 'a'
| Optical Properties | ASTM Test Method | |
| Yellow Haze | 0.75 | D1925 |
| Haze % | 0.21 | D1103 |
| Refractive Index n | 1.5 | D542 |
| Dispersion Factor | 57 | D542 |
| Visible Transmission % | 93.3 | D1003 |
| Ultra Violet Transmission % (3mm thickness) | ||
| at 300nm | 25.0 | |
| at 340nm | 77.0 | |
| at 380nm | 88.0 |
| Physical & Mechanical Properties | ASTM Test Method | |
| Density g/cc | 1.311 | D792 |
| Tensile Modulus (Mpa) | 2.400 | D638 |
| Taber Abrasion (xP.M.M.M.A) | 20 | D1044 |
| Rockwell Hardness (M) | 97 | D785 |
| IZOD Impact Resistance | 7.85 | D256 |
| Chemical Resistance with 7 days immersion (23 degC) | ASTM Test Method | |
| Water | ||
| Absobtion % | 0.40 | |
| Haze Variation % | +0.07 | |
| Acetone | ||
| Absobtion % | 0.78 | |
| Haze Variation % | 0 | |
| Toluene | ||
| Absobtion % | 0.40 | |
| Haze Variation % | 0 | |
| Ethyl Alcohol 95% | ||
| Absobtion % | 0.10 | |
| Haze Variation % | 0.04 | |
| Trichloroethylene | ||
| Absobtion % | 0.04 | |
| Haze Variation % | +0.06 | |
| HDT 1.82 MPa degC | 69 | D648 |
| Thermal Expansion | ||
| Linear coeff / degC | ||
| From 20 to 45 degC | 1.058. 10-4 | |
| From 45 to 82 degC | 3.246. 10-4 | |
| From 82 to 130 degC | 1.821. 10-4 |
| Flammability Test | Prism 'a' ADC Result | |
| 1. Burn Rate | 3.1 cm/min | |
| 2. Time to self ignite at 500 degC | 15 secs | |
| 3. TGA | onset 330 degC | |
| Maximum Burning Temperature | 392 degC | |
| 4. DSC | Not Definitive | |
| 5. Limited Oxygen Index Test | 20 - continues to burn if ignited | |
| 6. 36 Litre Dust Explosion Chamber | Class 1 |
| Chemical and Physical Data | |||
| Values | Method | Units | Specification |
| Viscosity at 25 degC | MG11.22 | cSt | 13.2 - 13.8 |
| Water | MG11.03 | % | 0.03 max |
| Colour apha | MG11.45 | 5 max | |
| Density at 20 degC | MG11.46 | g/ml | 1.14 - 1.18 |
| UV Radiation Resistance | |||
| Variation of yellow index in WOM for different plastics | |||
| ADC type | 250h | 750h | 1000h |
| PMMA | 0.53 | 0.73 | 0.73 |
| PC | 4.13 | 7.3 | 7.94 |
| ADC HI | 0.5 | 0.6 | 0.66 |
| Impact Resistance | |||
| A 16.3 steel ball is dropped in free fall from 1.27m | Lens thickness 1.15mm | ||
| Total Lenses | Crushed Lenses | Damaged Lenses | Total |
| ADC Type - 188 | 18 | 9 | 27 |
| ADC HI - 192 | 0.5 | 1.1 | 1.6 |