Brand selection for PP formula design

According to the national standard GB 2546-88, polypropylene resin is classified according to polymer type, main use, isotactic index, melt index and material characteristic properties. The polypropylene resin was composed in the following order.

Material characteristic performance melt index (see Table 1)
Isometric index (see Table 2)
Main use (see Table 3)
Polymer type (see Table 4)

Table 1 Polymer Type

H

Homopolymer

C

Block copolymer

R

Random copolymer

M

mixture

Table 2 Main uses

B

C

E

F

Blow molding

Squeeze

Extrusion

film

K

L

M

P

Cable covering

Monofilament

Injection molding

Pipe

R

S

T

Y

Rotational molding

Robe plastic

fiber

Flat wire

Table 3 isotactic index

Numbering

98

93

85

Equality /%

95-100

90-95

80-85

Numbering

75

65

55

Equality /%

70-80

60-70

50-60

Table 4 Melt index

Numbering

002

007

015

Melt index / g•10min -1

0.1-0.3

0.3-1

1-2

Numbering

030 <

Medical Silicone one way check valve for Manual Respirator


Silicone valves, also known as One way valves, non-return valves, air flow valves, rubber check valves, which are used for controlling the direction of fluids` flow. Our silicone valves can be universally applied in many different applications, whether in the health care, automotive, appliance or food and packaging industries. Silicone valves include umbrella valves, duckbill valves, membrane valves, flapper valves and diaphragm valves, etc.

How it works

One way valves are used for controlling the direction of flow of a fluid. Designs can include umbrella valves, duckbill valves, Belleville Valves and diaphragm valves etc.
One way valves can be designed to provide the customer's required head loss and flow rate for particular applications.
A range of materials and designs are available to handle different fluids and service conditions.
Silicone Duckbill Valve, mostly used in the Patient Valve for Manual Resuscitator.



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