Polmix is a producer of SMC and BMC

Sheet Moulding Compound and Bulk moulding compound are thermoset materials, that means that the crosslinking inside is irreversible.

The materials consist of the following components:

  • Resin (unsaturated polyester – orthophtalic, maleic, isophtalic based)
  • Shrink compensator (tipically polystyrene and polivinil acetate)
  • Fillers (calcium carbonate and ATH)
  • Reinforcement (glass or carbon fibers)
  • Additives (thickening and mould releasing agent)
  • Curing system


The resin shrinkage can be controlled and adjusted by adding LS (Low shrinkage) or LP (Low profile) additives.

For optimum surface qualities materials with negative shrinkage (= expansion) are formulated.

Manufacture of SMC
Sheet moulding compound composites are made from chopped multi end roving strand sandwiched between two layers of film, onto the resin paste (resin, shrink compensation, fillers, additives and curing agent) has already been applied. The prepreg passes through a mechanical compacting system that ensures complete strand impregnation and makes a sheet wound into rolls or zig-zag folded. These are stored for pre maturing before moulding to allow the prepreg to thicken into a mouldable viscosity: the thickening process is normally obtained by the reaction between polyester resin and magnesium oxide.

Manufacture of BMC (in some countries called DMC, dough moulding compound)
BMC composites are made from a premix, consisting resin, shrink compensation, additives and curing agent which is compounded in dissolvers, and the reinforcement, consisting of chopped fibres. The final mix and homogenisation is made in different types of kneeders. BMC is compacted and packed in styrene tight bags in variable size, fitting the different injection moulding machines stuffer units.

Moulding of SMC and BMC
Moulding is made in heated steel tools at temperatures between 125°C and 170°C.

Compression moulding
Layers of SMC or preformed pellets of BMC are placed into the heated tool. Through closing the tool the material fills the cavity and polymerizes. After complete cure the parts are released.
With compression moulding highest mechanical strengths can be achieved.

Injection moulding
BMC or injection SMC are placed in the stuffer which feeds the injection unit. Injection moulding is used for highest precision parts and complex geometries

ProduitRetraitTaux de verreMass volumiqueContrainte en flexionModule en flexionResilience au choc (Charpy)Absorption d'eauTempérature de
flechissement sous charge
Application
  % % g/cm3 MPa GPa kJ/m2 % °C  
SMC ISO2577 ISO1172 ISO1183 UNI EN ISO 178 UNI EN ISO 178 UNI EN ISO 179 ISO62 ISO75  
S5002 0.05/0.10 21-25 1.75-1.80 140-160 > 9 55 < 0.2 > 200 Isolateur électriques
S5008 0.05/0.10 18-22 1.75-1.80 140-160 > 9 > 65 < 0.2 > 200 Armoires électriques
S5011 0.10/0.15 18-22 1.75-1.80 140-160 > 9 > 60 < 0.2 > 200 Armoires électriques
S5012 0.05/0.10 23-27 1.81-1.87 150-160 9.5-10.5 80 < 0.2 > 200 Armoires électriques / Ferroviarie
S5020 0.06/0.09 23-27 1.70-1.75 130-150 9 > 60 < 0.2 > 200 Armoires électriques
S5034 0.12/0.18 18-22 1.78-1.82 130-140 9 50-60 < 0.2 > 200 Interrupteur électriques
S5038 0.05/0.10 18-22 1.75-1.80 130-150  9 > 60 < 0.2 > 200 Armoires électriques
                   
L904x 0.13/0.17 12-17 1.65-1.75 110 7.5 40 < 0.2 > 200 Sièges WC
                   
LP1112 -0.06 / - 0.01 35-39 1.88-1.93 170-180 10-11 90-95 < 0.2 > 200 Secteur énergétique
                   
LS 17xx 0.09/0.15 21-25 1.72-1.78 110-130 9 50 < 0.2 > 200 Plateaux
                   
LP332 -0.05/0.01 24-28 1.75-1.80 > 140 9 70 < 0.2 > 200 Meubles
LP1421 0.05/0.00 23-27 1.76-1.82 140-160 10-11 70-90 < 0.2 > 200 Meubles
                   
LP331 -0.05/0.00 23-27 1.75-1.80 > 140 9 > 70 < 0.2 > 200 Tracteurs
ProduitRetraitTaux de verreMass volumiqueContrainte en flexionModule en flexionResilience au choc (Charpy)Absorption d'eauTempérature de flechissement sous chargeApplication
  % % g/cm3 MPa GPa kJ/m2 % °C  
 BMC ISO2577 ISO1172 ISO1183 UNI EN ISO 178 UNI EN ISO 178 UNI EN ISO 179 ISO62 ISO75  
RF1118 0,1 18 1,8 90 10 35 < 0.2 > 200 Disjoncteurs miniatures
RF11/20 0,1 20 1,8 100 9,5 35 < 0.1 > 200 Disjoncteurs miniatures
RF11/22 0.07/0.13 20 1,8 90 8 35 < 0.1 > 200 Disjoncteurs miniatures
RF1127 0,1 25 1,78 110 7,5 45 < 0.1 > 200 Disjoncteurs miniatures
RF1130 0,1 27 1,78 115 10 40 < 0.1 > 200 Disjoncteurs miniatures
                   
HP1600 0.05/0.15 25 1,78 150 12 50 < 0.1 > 200 Disjoncteurs
RF3/23 0,12 23 1,85 100 10 30 < 0.1 > 200 Disjoncteurs
RF1130 0,1 27 1,78 115 10 40 < 0.1 > 200 Disjoncteurs
RF3/20 0.04/0.08 20 1,8 90 7 30 < 0.1 > 200 Disjoncteurs
RF6/20 0,1 22 1,8 90 7 30 < 0.1 > 200 Disjoncteurs
                   
RF210/20 0,18 18 1,75 90 9 25 < 0.1 > 200 Isolateur électriques
                   
RF3/20 0.04/0.08 20 1,8 90 7 30 < 0.1 > 200 Moteurs d'aspiration
RF11/22 0.07/0.13 20 1,8 90 8 35 < 0.1 > 200 Moteurs d'aspiration
LS10/13 -0.02/+0.01 13 1,82 80 7 20 < 0.1 > 200 Moteurs d'aspiration
RF10/20 0,02 20 1,8 85 8 30 < 0.1 > 200 Moteurs d'aspiration
LS112 0,1 22 1,8 80 8,5 35 < 0.1 > 200 Moteurs d'aspiration
                   
LP140 -0.08/0.00 14 1,9 75 9 20 < 0.1 > 200 Phares
LP6/19 -0,04 19 1,9 140 10 37 < 0.1 > 200 Automotive
                   
RF3/20 0.04/0.08 20 1,8 90 7 30 < 0.1 > 200 Ferroviarie
RF3/33 0.02/0.08 33 1,8 140 11 45 < 0.1 > 200 Ferroviarie

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