Industry news

Advantages and disadvantages of Latex、Polysulfides、silicone and polylurethanes

Advantages of Letax:

1 inexpensive          

2 very rlastic,thined wall and strong

3 molds last a long time and offer good abrasion resistance

4 good for making glove molds

Disadvantages of Letax:

1 strong ammonia smell

2 latex can only be brushed onto model

3 20+coats needed to make mold

4 time factor:many days to complete

5 high shrinkage

6 good for casting concrete,wax or plaster,but not good for casting resins,low temp.melt metal alloys


Advantages of Polysulfides:

1 soft,stretchy and durable

2 long mold lift(30+years)

3 moderate cost

4 loves moisture,sulfur clays

Disadvantages of Polysulfides:

1 gram scale necessary to weigh parts A and B

2 offensive order

3 may stain plaster

4 good for casting plaster or wax.not good for casting concrete,resins or low temp.melt metal alloys


Advantages of Silicone:

1 best release properties((1)model surface preparation minimal or not required  (2) release agent offen not required when casting most material in molds

2 casting low temperature melt metal alloys

3 400F/205C high temperature resistance

4 high tear strength

5 knotty tear propagation

6 good chemical resistance for casting resins

Disadvantages of Silicone

1 expensive(especially platinum cure)

2 requires precise measurement

3 high viscosity

4 vacuum degassing requiredvacuum equipment 800$-1000$

5 tin catalyzed silicone(higher shrinkage over time,limited library life

6  platinum cured siliconeexpensive,dimensional stability-no shrinkage, subject to cure inhibition

7 good for casting all mediums


Advantages of polylurethane rubber:

1 wide hardness range shore A 00 to shore A 90 

2 long library life

3 relatively low cost

4 convenient mix ratio lA:1B by volume--no scale required

5 lower vicosity--no degassing

Disdvantages of polylurethane rubber:

1 adhesive to most surfaces

2 moisture sensitive

3 unused product has limited shelf life after opening

4 good for casting wax,plaster,concrete and resins(release agent is required)

5 not good for casting low temperature melt metal alloys

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