Silicone rubber for making molds

  Typical properties

There are six different grades of series 6

Mark

HY615

HY620

HY625

HY630

HY638

HY640

Color

White

White

White

White

White

White

The proportion of curing agent(%)

2-4%

2-4%

2-4%

2-4%

2-4%

2-4%

Time life(min 25 0 C)

20

20

20

20

20

20

Time polymerization

(hours 25 0 C)

18-24

18-24

18-24

18-24

18-24

18-24

Hardness on Shore ( A °)

15

20

25

30±2

34

39±2

Density (g/cm 3 )

1.08

1.08

1.08

1.08

1.08

1.08

Viscosity (mPas -25 0 C)

11000

15000

21000

22000±2000

23000

11000±2000

Strength on gap ( kgf / cm 2 )

≥ 23

≥ 32

≥ 36

≥ 45

≥ 49

≥ 38

Resistance tear

  (kgf /cm )

≥ 14

≥ 22

≥ 27

≥ 33

≥ 23

≥ 25

Elongation when the gap (%)

≥ 390

≥ 440

≥ 450

≥ 460

≥ 485

≥ 355

Linear shrinkage (%)

≤ 0.25

≤ 0.25

≤ 0.25

≤ 0.25

≤ 0.25

≤ 0.25

The Foundation is a homogeneous viscous liquid white.

The curing agent is a colorless liquid.

Method of application

The initial sample surface must be clean and free from contamination When necessary, especially when using porous bases, use a separating agent is a wax lubricant having a viscosity of 100 cst ,soap solution(lye).

The mixture of komponentov

Thoroughly mix the base before use due to possible separation of the filler during prolonged storage.

Weigh 100 parts of A and 3-5 parts of hardener (Check out proportion in your passport on a specific game) in a clean container.Mix composition prior to complete distribution of the hardener into the base. Mix sufficiently small quantities to ensure thorough mixing of base and curing agent. Mixing can be done manually or mechanically, but not too long, because a long stirring produces a lot of air bubbles. The temperature is above 25 ° C and high humidity significantly shorten the life span of the compound (the time before curing).

To remove air bubbles, it is recommended to use a vacuum chamber, the mixture will increase in volume by 2-3 times, and then settle.It is therefore necessary to use a sufficiently large container.

After 1-2 minutes of degassing, the mixture should be checked and, in the absence of air bubbles, can be used on.

Caution! Too long the evacuation will result in the removal of volatile components from the mixture and can cause poor curing of the thickened portions and the emergence of atypical properties.

If there is no suitable equipment for pumping, air gaps can be minimized if you can mix a small quantity of base and curing agent, then using a brush, apply a thin layer sample. Leave at room temperature until, until the surface is cleaned from bubbles and begins to harden. Then mix the following portions of base and curing agent and repeat all to the finished shape.

Pouring the mixture and curing

As quickly as possible pour the mixture of base and curing agent on the original sample, taking care to avoid inclusion of air bubbles. The material will be cured to a state of a flexible rubber within 24 hours, after that the elastic form can be removed. If the operating temperature is below +23 º C, the cure time increases. Final mechanical properties of the elastic form will be achieved after 72 hours.

Stability of elastic forms the molded materials

Fully hardened series 6 has excellent chemical resistance to various substances, with the exception of the alkalis with pH more than 15. The material is designed for durability elastic molds for casting plaster, wax and polyester resins.However, resins and other corrosive moulding materials affect silicone elastic form, changing their physical properties, ease of demoulding and maybe the size. With prolonged use elastic forms required periodic inspection of their condition.

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