Sylmasta Ltd Silicone Moulding Rubber


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Industry, Maintenance, & Construction

Silicone Moulding Rubber

Grade 370 Rubber for Polyurethane Resins 1kg

Grade 370 rubber is a high tear strength rubber for the casting of polyurethane resins. Its high tear strength permits castings to be made with larger than normal under cuts.

Due to its softness and flexibility, 370 rubber is particularly good for when there are deep undercuts.

Key Benefits:
• Good for deep undercuts
• High Tear Strength
• High elongation
• Easy degassing
• Chemically resistant
• Pot Life: 45-120 minutes.
• De-mould: 10 hours
• Mixed viscosity: 11,000 mPa.s

Cured Properties:
• Shore A hardness: 15°
• Elongation at break: 622%
• Tensile strength: 2.8 MPa
• Tear strength: 20.18 kN/m
• Young's modulus: 0.79MPa
• Linear shrinkage: 0.46%
• Min. service temperature: -50°C
• Max. service temperature: 200°C
• Pale blue (when mixed)

Comes complete with hardener - mix-ratio is 5 parts of hardener to 100 parts of rubber.

Price:
£24.50 (€31.01)
£29.40 (€37.21) Including VAT at 20%

RECOMMENDED - buy 1ml Pipettes for measuring catalyst (Pack of 10) £1.00 +VAT
Buy Mould Release Agent (50ml). £6.30 +VAT
Add Acetone (1 litre). £5.52 +VAT

Quantity:

Grade 380 Rubber for Polyurethane Resins 1kg

Grade 380 rubber is a high tear strength rubber for the casting of polyurethane resins. Its high tear strength permits castings to be made with larger than normal under cuts.
When cured, it is stiffer that grade 370 (giving it better dimensional stability) but softer than grade 390 (making it better for deep undercuts).

Key Benefits:
• Good dimensional stability
• High Tear Strength
• Easy degassing
• Chemically resistant
• Pot Life: 45-120 minutes.
• De-mould: 8 hours
• Mixed viscosity: 16,500 mPa.s

Cured Properties:
• Shore A hardness: 18°
• Elongation at break: 539%
• Tensile strength: 3.11 MPa
• Tear strength: 23.49 kN/m
• Young's modulus: 1.18 MPa
• Linear shrinkage: 0.39%
• Min. service temperature: -50°C
• Max. service temperature: 200°C
• Pale blue (when mixed)

Comes complete with hardener - mix-ratio is 5 parts of hardener to 100 parts of rubber.

Price:
£24.50 (€31.01)
£29.40 (€37.21) Including VAT at 20%

RECOMMENDED - buy 1ml Pipettes for measuring catalyst (Pack of 10) £1.00 +VAT
Buy Mould Release Agent (50ml). £6.30 +VAT
Add Acetone (1 litre). £5.52 +VAT

Quantity:

Grade 390 Rubber for Polyurethane Resins 1kg

Grade 390 rubber is a high tear strength rubber for the casting of polyurethane resins. Its high tear strength permits castings to be made with larger than normal under cuts. When cured, it is stiffer that 370 and 380 giving it better dimensional stability.

Key Benefits:
• High Detail Pickup
• High Tear Strength
• Good dimensional stability
• Easy degassing
• Chemically resistant
• Pot Life: 45-120 minutes.
• De-mould: 8 hours
• Mixed viscosity: 19,500 mPa.s

Cured Properties:
• Shore A hardness: 22°
• Elongation at break: 497%
• Tensile strength: 3.64 MPa
• Tear strength: 26.24 kN/m
• Young's modulus: 1.5 MPa
• Linear shrinkage: 0.4%
• Min. service temperature: -50°C
• Max. service temperature: 200°C
• Pale blue (when mixed)

Comes complete with hardener - mix-ratio is 5 parts of hardener to 100 parts of rubber.

Price:
£24.50 (€31.01)
£29.40 (€37.21) Including VAT at 20%

RECOMMENDED - buy 1ml Pipettes for measuring catalyst (Pack of 10) £1.00 +VAT
Buy Mould Release Agent (50ml). £6.30 +VAT
Buy Acetone (1 litre). £11.99 +VAT

Quantity:

Grade 375 Rubber For White Metal 1kg

High Temperature RED 375 rubber is the only grade of moulding rubber for the casting of white metals. It sets moderately hard and offers good protection against chemicals and environmental contamination, shock and vibration.

375 moulding rubber is also used to encapsulate sensitive electrical and electronic assemblies.

Key Benefits:
• High Temperature Rating
• Good flow properties
• Chemically resistant
• Pot Life: 60 minutes.
• De-mould: 4 hours
• Mixed viscosity: 40,000 mPa.s

Cured Properties:
• Shore A hardness: 61°
• Elongation at break: 131%
• Tensile strength: 4.77 MPa
• Tear strength: 8.10 kN/m
• Young's modulus: 4.18 MPa
• Linear shrinkage: 0.41%
• Min. service temperature: -60°C
• Max. service temperature: 250°C
• Volume Resistivity:
• Surface Resistivity
• Volume Resistivity: ASTM D-257 1.51E+14 ohm.cm
• Surface Resistivity: ASTM D-257 ohm
• Dielectric Strength: ASTM D-149 20kV/mm
• Power Factor at 1MHz: BS903 Part C3 2.5E-3
• Red

Comes complete with hardener - mix-ratio is 5 parts of hardener to 100 parts of rubber.

Price:
£28.40 (€35.95)
£34.08 (€43.14) Including VAT at 20%

RECOMMENDED - buy 1ml Pipettes for measuring catalyst (Pack of 10) £1.00 +VAT
Buy Mould Release Agent (50ml). £6.30 +VAT
Add Acetone (1 litre). £5.52 +VAT

Quantity:

Mould Release Agent 50ml

Mould Release Agent 50ml

Price:
£6.93 (€8.77)
£8.32 (€10.52) Including VAT at 20%

Mould Release Agent 50ml
Silicone mould release agent prevents the silicone moulding rubber from sticking to itself during the making of split moulds. There is no need to apply the release agent to the master as this can result in a loss of fine detail.

When making a split mould allow the first half of the mould to fully cure then lightly coat the mating face with the release agent using a brush and allow to dry.

Quantity:

Casting Pewter Ingot 1.2kg

Casting Pewter Ingot 1.2kg

Price:
£64.80 (€82.02)
£77.76 (€98.42) Including VAT at 20%

This lead free pewter will give good detail castings. Can be used in place of standard white metal for casting.
Castings can be either polished or painted.
Pouring temperature is 250 - 300ºC, it can be melted in a ladle over a gas flame.

Dimensions: 330 x 20 x 20mm.
Mass: approx. 1.2kg

Quantity: