Nomenclature

Ultramid commercial grades are uniformly designated by letters and digits which indicate chemical composition, melt viscosity, stabilization, glass fiber content and processing behavior.

1st letter
Type of PA
B = PA 6
A = PA 66
C3 = copolyamide 66/6
(melting point 243 °C)
C35 = copolyamide 6/66
(melting point 196 °C)
T = copolyamide 6/6T
(melting point 298 °C)
KR = special order products

1st digit
Viscosity class
3 = easy flowing, low melt viscosity, mainly for injection molding (however Ultramid B3 without additives and reinforcement only for extrusion),
35 = Low to medium viscosity, for injection molding and for extruding monofilaments and films.
36 = medium,viscosity, for film extrusion
4 = medium viscosity, for injection molding and extrusion
5 = high melt viscosity, for extrusion only

2nd or 2nd and 3rd letter
Type of stabilization
E, K = stabilized, light natural color, enhanced resistance to heat aging, weather and hot water, physiologically harmless, dielectric properties remain unaffected (see Table 2)
H = stabilized enhanced resistance to heat aging, weather and hot water, only for engineering parts,electrical properties remain unaffected, natural color (see Table 2)
W = stabilized, high resistance to heat aging, only available uncolored and black, less
suitable if high demands are placed on the part’s electrical properties (see Table 2)

Special properties, additives
F = for flat film extrusion with enhanced feed performance characteristics
HR = enhanced hydrolysis resistance
L = impact - modified and stabilized, impact resistant when dry, easy flowing, for fast processing
N = for transparent films with improved clarity
R = PE-modified and stabilizes, for highly stressed, low noise, wear resistant, low - friction bearings
S = for rapid processing, very fine crystalline structure; for injection molding
U = contains phosphorus halogen - free flame retardant
X2 = phosphorus-containing flame retardant
Z = impact modified and stabilized with very high low -temperature impact strength (unreinforced grades) or enhanced impact strength (reinforced grades)

Type of reinforcement
G (plus digit) = glass fiber reinforced
C (plus digit) = carbon glass fiber reinforced
K (plus digit) = glass bead reinforced, stabilized
M (plus digit)= mineral - filled, stabilized; special product: M602 with 30 % special silicate (enhanced rigidity)
Combinations available with glass fiber reinforcement:GM (glass fibers/mineral)
GK (glass fibers/glass beads)

2nd or 2nd and 3rd digit
Content of reinforcing material (mass fraction)
2 = 10%
3 = 15%
4 = 20%
5 = 25%
6 = 30%
7 = 35%
8 = 40%
10 = 50%
The amount of reinforcing materials for combinations of glass fibers (G), with mineral (M) or glass beats (K) indicated by 2 digits, e.g.:
GM 53 = 25 % glass fibers and 15% mineral, stabilized
GK 24 = 10 % glass fibers and 20% glass beads, stabilized

Example 1
Ultramid B3EG6
B = PA 6
3 = viscosity class 3 (low viscosity for injection molding)
E = stabilized, high long-term heat resistance, light natural color
G6 = 30 % glass fibers

Example 2
Ultramid A3WGM53
A = PA 66
3 = viscosity class 3 (low viscosity for injection molding)
W = stabilized, very high resistance to high aging
GM = Combination of glass fiber and mineral reinforcement
53 = 25% glass fiber and 15% mineral

Example 3
Ultramid A4
A = PA 66
4 = viscosity class 4 (medium viscosity for extrusion)

Example 4
Ultramid A3X2G10
A = PA 66
3 = viscosity class 3, (low viscosity for injection molding)
X2 = fire safety additive
G10 = 50 % glass fibers