Wardray Premise

Premac® Lead Acrylic

Part of the Wardray Premise Total Radiation Shielding Package



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.

Premac®
Premac®
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Thickness and Lead Equivalent

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It 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
[1] 100 to 200kV narrow beam transmission as verified by the Health Protection Agency, Harwell, UK.

Physical Properties

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Premac® 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

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Premac® Light Transmission
Premac® Light Transmission
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Tranmission Properties
Refractive index nd 1.54
Reflective index p 0.0454

Radiation Resistance

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Premac® 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

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Premac® 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