REGISTER OVERVIEW PLASTICS

13/52 PLASTICS
PMMA ACRYLIC GLASS
Product description for PMMA (polymethyl methacrylate)
Material density:
1.19 g/cm 3
Service temperature:
–20 °C to +70 °C (for PMMA XT/extruded)
–20 °C to +80 °C (for PMMA GS/cast)
Amorphous thermoplastics with low moisture content and
water absorption. Glass clear with highly luminous surface, high
brilliance and crystal clear transparency, can be dyed in many
colours, transparent and muted.
Main properties of PMMA:
• Hard and rigid, but brittle – shatter-proof to a limited extent,
up to impact-resistant
• Very high weathering and ageing resistance
• Very good surface
• Large range of colours in both grades
• Good chemical resistance to dilute acids (average concentration)
• Resistant to organic solvents to a limited extent
• Not resistant to strong acids/nitro-cellulose combi thinners, etc.
• Good cutting properties (short cut)
• Very good sticking properties
• Physiologically safe (suitable for contact with foodstuffs)
Comment:
Important: PMMA is prone to stress cracks
(if emulsions, cutting oils and detergents that contain solvents are
used, this can lead to stress cracks).
The relatively high coefficient of thermal expansion should be
taken into account when creating designs. If used outdoors, up to
approx. 0.5 % or ± 5 mm/metre.
Grades:
PMMA XT/extruded clear, transparent/as well as in various
standard colours
PMMA GS/cast clear, transparent/as well as in various standard
colours
Thickness tolerances according to DIN ISO 7823-1/2
PMMA GS = 2 – 25 mm tolerance ±10 % plus 0.4 mm
(e.g. 8 mm of 6.8 – 9.2 mm)
PMMA GS block product > 25 mm –0/+4 to – 0/+7 mm according to
thickness
PMMA XT = ±5 %
PMMA GS cast boards are manufactured between two panes of
glass and polymerised in batches. They have a very high molecular
weight and, as a result, are more rigid and less prone to cracking,
making them easier to process subsequently.
PMMA XT extruded boards are continuously manufactured using
an extruder, possess a lower molecular weight and are thus more
flexible and easier to deform.
Application:
Construction and protective glazing, device covers, machine
protection, roofing
Processing:
Good cutting properties (short cut) High cutting speeds and
sufficient cooling are required, as friction causes PMMA to
overheat and then to smear. Good hot forming, very good sticking
properties (see machining information)
Dimensions:
Boards 1 – 50 mm
Tubes 10 – 200 mm outer diameter
Round rods 5 – 100 mm diameter
Board dimensions Up to 2050 x 3050 mm
Round and tube lengths 2000 mm each
Boards available in a range of colours and grades.
Please observe the detailed list of dimensions for each grade.
Material name PMMA GS PMMA XT
Cast board Extruded board
Properties Norm Unit
Tensile strength ISO 527 (1) MPa 75 70
Elongation at tear ISO 527 (1) % 4 4
Bending strength ISO 178 (2) MPa 116 107
Flexural modulus of elasticity ISO 178 (2) MPa 3210 3030
Charpy impact strength ISO 179 (3) kJ/m 3 12 10
Vicat softening point ISO 306 (4) method A °C > 100 > 105
Rockwell hardness ISO 2039-2 M scale 102 101
Transparency ASTM D1003 % (5) > 92 > 92
Refractive index ISO 489/A – 1.49 –
Water absorption ISO 62 % 0.2 0.2
Relative density ISO 1183 – 1.19 1.19
Note: (1) 5 mm/minute; (2) 2 mm/minute; (3) unnotched; (4) method A; (5) in 3 mm
Shop
plastics@reiff-group.com / www.reiff-tp.com