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Composite Molding

For the infusion and prepreg methods, alongside resin additives, WACKER also supplies silicone rubber grades and fabrics for the production of vacuum bags.These bags can be placed quickly and securely over the mold before each part is produced. Repeated, time-consuming sealing with conventional vacuum film is no longer necessary. Bags made with rapid-curing, two-part ELASTOSIL® silicone rubber guarantee more processing runs, fewer vapors and more flexibility.

Large number of reproductions: the bags (approx. 4x3 m) can be rolled up for transportation and used again and again. This bag has already beed used 250 times.

From aeronautic, through transportation to consumer goods, many application areas are now unimaginable without fiber-reinforced plastic composites. WACKER silicone rubbers and fabrics for re-usable vacuum bags improve the composite resin infusion molding process. These silicone bags are placed quickly and securely over the mold before each part is produced. Repeated, time-consuming sealing with conventional vacuum film is no longer necessary.

Benefits of Silicone Bag Technology:

  • Faster production
  • Better repeatability and quality
  • Lower emissions of volatile components
  • Less waste
  • Less labor intensive

Benefits of ELASTOSIL®:

  • Flexible
  • Yet self-leveling
  • Longer pot life and curing time
  • Suitable for large surfaces
  • Suitable for vertical surfaces
  • Reusable

Silicones are also used for the production of wedges or bladders, used to apply pressure to the composite during the manufacturing process. Re-usability and release properties together with good chemical resistance are the key advantages here.

Product Recommendations

Table is scrollable
Products
Technical data
Product properties
Viscosity, dynamic Tear strength Hardness Shore A Tensile strength Elongation at break Resistance Surface property Regulation Product Rheology Crosslinking Property
CENUSIL® M 830 A/B 8000 mPa·s[1] 8000 mPa·s[1] > 20 N/mm[4] > 20 N/mm[4] 26[5] 26[5] 5 N/mm²[7] 5 N/mm²[7] 500 %[9] 500 %[9] Resistance against concrete - Food-contact Flowable No chemical shrinkage, Two-component, Addition Curing
ELASTOSIL® C 1200 A/B 20000 mPa·s[1] 20000 mPa·s[1] 25 N/mm[4] 25 N/mm[4] 25[5] 25[5] 5 N/mm²[7] 5 N/mm²[7] 500 %[9] 500 %[9] Resistance against polyester, Resistance against epoxy resins - - Flowable No chemical shrinkage, Two-component, Addition Curing, Fast curing at room temperature
ELASTOSIL® C 1500 US A/B 26000 mPa·s[2] 26000 mPa·s[2] 25 N/mm[4] 25 N/mm[4] 27[6] 27[6] 5 N/mm²[8] 5 N/mm²[8] - - - - - - -
ELASTOSIL® C 1500 US A/B CRT - - - - - - - - - - - - - - -
ELASTOSIL® M 4601 A/B 15000 mPa·s[3] 15000 mPa·s[3] > 30 N/mm[4] > 30 N/mm[4] 28[6] 28[6] 6.5 N/mm²[8] 6.5 N/mm²[8] 700 %[10] 700 %[10] Resistance against casting resins - Food-contact Flowable No chemical shrinkage, Two-component, Addition Curing
ELASTOSIL® M 4642 A/B 20000 mPa·s[3] 20000 mPa·s[3] > 30 N/mm[4] > 30 N/mm[4] 37[6] 37[6] 7 N/mm²[8] 7 N/mm²[8] 480 %[10] 480 %[10] Resistance against casting resins - - Flowable No chemical shrinkage, Two-component, Addition Curing
ELASTOSIL® M 4670 A/B 120000 mPa·s[3] 120000 mPa·s[3] 15 N/mm[4] 15 N/mm[4] 55[5] 55[5] 5.5 N/mm²[7] 5.5 N/mm²[7] 280 %[9] 280 %[9] Resistance against polyester, Resistance against epoxy resins, Resistance against PU Dry surface Food-contact Flowable No chemical shrinkage, Two-component, Addition Curing
ELASTOSIL® RT 625 A/B 25000 mPa·s[3] 25000 mPa·s[3] 30 N/mm[4] 30 N/mm[4] 25[5] 25[5] 6.5 N/mm²[7] 6.5 N/mm²[7] 600 %[9] 600 %[9] - - - Flowable Two-component, Addition Curing
Legend
[1] Viscosity, dynamic | 23 °C | ISO 3219,  [2] Viscosity, dynamic | 23 °C ,  [3] Viscosity, dynamic after stirring | 23 °C | ISO 3219,  [4] Tear strength | ASTM D 624 B,  [5] Hardness Shore A | DIN ISO 48-4,  [6] Hardness Shore A | ISO 868,  [7] Tensile strength | ISO 37 type 1,  [8] Tensile strength | ISO 37,  [9] Elongation at break | ISO 37 type 1,  [10] Elongation at break | ISO 37