Premac® lead acrylic is a lead loaded acrylic copolymer resin with particular shielding properties and can be used in the production of glove boxes, windows, mammography screens, laboratory ware, cabinets and bench shields.
The material is transparent with a very light brown tint, exhibiting virtually all the normal chemical and physical properties of conventional acrylic. The lead content is 30% wt/wt and is chemically introduced into the acrylic resin as an organolead salt.
Thickness and Lead Equivalent
TopIt is available in a range of seven standard thicknesses (H8 to H70)and lead equivalents. We carry large stocks of the most popular sizes for fast delivery at competitive prices.
| Type | Physical Thickness | Lead Equivalent[1] | Weight (kg per m2) | Maximum Dimensions (mm) |
|---|---|---|---|---|
| H8 | 8.5mm ± 0.7mm | 0.3mm | 14kg | 1830 x 2440 |
| H12 | 12mm ± 1mm | 0.5mm | 19kg | 1830 x 2440 |
| H18 | 18mm ± 1mm | 0.8mm | 29kg | 1830 x 2440 |
| H22 | 22mm ± 2mm | 1.1mm | 35kg | 1830 x 2440 |
| H35 | 35mm ± 2mm | 1.5mm | 56kg | 1830 x 2440 |
| H46 | 46mm ± 3mm | 2.2mm | 74kg | 1220 x 2440 |
| H70 | 70mm ± 3mm | 3.0mm | 112kg | 1220 x 2440 |
Physical Properties
TopPremac® can be shaped and drilled to suit exact requirements and has a polished finish. We supply it with a special masking paper for protection during storage and handling.
Supplied in seven thicknesses and in sizes cut to special order, the material may be laminated to increase the shielding capabilities or bonded between sheets of plain acrylic.
| Physical Properties | |
|---|---|
| Density | 1.6 g/cm3 |
| Tensile Strength | 490 kg/cm2 |
| Elongation | 18% |
| Izod Impact Strength (notched) | 3.0 kg/cm2 |
Light Transmission
Top
| Tranmission Properties | |
|---|---|
| Refractive index nd | 1.54 |
| Reflective index p | 0.0454 |
Radiation Resistance
TopPremac® exhibits good radiation resistance. When exposed to a 1x105 total dose of Cobalt 60 gamma radiation little or no deterioration of its physical properties was observed as shown in the table below. In the same test the rate of discolouration for Premac® was also much less than for either lead or plate glass.
| Dose (150 r/hr) | 1x104 | 5x104 | 1x105 |
|---|---|---|---|
| Retained flexural Strength (%) | 100 | 105 | 105 |
| Retained Izod Impact Strength (%) | 98 | 97 | 93 |
Chemical Resistance
TopPremac® has similar chemical resistance to conventional acrylic. This chart illustrates the chemical resistance, as judged by visual observation, of small samples immersed at 20°C for 1 week in the chemicals listed.
| Unsatisfactory - decomposed or dissolved | Some Attack - slight crazing or swelling | Satisfactory - no effect |
|---|---|---|
|
Acetic Acid (99%) Sulphuric Acid (98%) |
Acetone Chloroform Meta-Cresol Diethyl Ether Dimethyl Formamide Ethyl Acetate Ethyl Alcohol (99.5%) Ethyl Alcohol (50%) Hydrochloric Acid (36%) Methyl Alcohol Methylene Dichloride Methyl Ethyl Ketone Nitric Acid (60%) Nitric Acid (12%) Pyridine Sodium Hydroxide (35%) Tetraline Tetrahydrofurane Toluene |
Carbon Tetrachloride Dibutyl Phthalate Dioctyl Phthalate n-Hexane Isopropyl Alcohol Sodium Hydroxide (10%) Water |
