Product: Twintex® Fabrics
Description : T PP 60 1485 BF – Twill 2*2 Balanced.

Physical property data developed in accordance with ASTM specifications. Average values shown are based upon test conducted on materials molded under laboratory conditions. In addition, properties can be influenced by fabricator processing conditions.

 

In as much as OCV™ Reinforcements has no control over fabrication, installation, design, installation workmanship, accessory materials, or conditions of application, OCV™ Reinforcements does not warrant the performances or results of any installation or use of the product or of any final product into which the product may be incorporated by the purchaser and/or user. THIS WARRANTY DISCLAIMER INCLUDES ALL IMPLIED WARRANTIES, STATUTORY OR OTHERWISE, INCLUDING THE WARRANTY OF MERCHANTABILITY AND OF FITNESS FOR A PARTICULAR PURPOSE. The purchaser and/or user should perform its own tests to determine the suitability and fitness of the product for the particular purpose desired in any given situation.

 

Multi-Axial Impact Properties of Twintex® Fabric

 

Background

 

One of the great advantages of Twintex® fabric is its impact strength. Many high impact applications not only require room temperature impact resistance, but low and high temperature impact resistance. Multi-Axial Impact Testing (Falling Dart) was performed at a series of temperatures to characterize the low and high temperature impact strength of Twintex® fabric.

 

Experimental

 

> Material

 

Test panels were prepared from four layers of Twintex® fabric product T PP 60 1485.
The panels have a nominal thickness of 4 mm. The fabric has the following characteristics:

 

Weight % glass	60%
Weight % polypropylene	40%
Areal weight	1485 g/m²
Nominal molded fabric thickness	1mm
Weave type	Balanced 2X2 Twill
Color	Black

 

 

> Sample Preparation

 

Twintex® panels were prepared at OCV™ Reinforcements by molding four layers of Twintex® fabric.

 

The fabric was placed between two thin stainless steel platens and heated in a 210 oC press at a pressure of 5 bars. When the middle of the fabric stack reached 205 oC the platens and fabric were transferred to a cold press and cooled to room temperature at a pressure of 15 bars pressure.

 

> Test Specifications

 

Multi Axial Impact tests were performed in accordance with ASTM D 3763-95 on a Dynatub 8250 Instrumented Impact Tester. The impact velocity was 2.2 m/sec and 6.7 m/sec. The tests were run using a 12.7-mm hemispherical tub with a 76.2-mm diameter clamp and support. The test were performed at a series of temperatures form –40 oC to 120 oC .The tests were run internally and at an A2LA laboratory to verify results.

 

Results

 

 

Internal test
Test temperature	120°C	23°C	0°C	-15°C	-30°C	-40°C
Impact velocity (m/sec)	2.2	2.2	2.2	2.2	2.2	2.2
Peak energy (Joules)
Average	47.7	41.8	48.6	48.3	57.5	54.8
Standard deviation	5.2	4.3	4.3	6.5	5.9	6.5
COV	11.0	10.2	8.8	13.5	10.3	11.9
Maximum	59.8	52.2	56.0	60.0	66.8	66.3
Minimum	37.4	31.0	41.6	37.5	37.5	47.9
Total energy (Joules)
Average	61.3	62.4	70.8	69.7	85.4	80.8
Standard deviation	3.5	2.4	5.3	4.6	5.8	4.6
COV	5.7	3.9	7.5	6.6	6.8	5.7
Maximum	66.6	66.9	83.5	79.5	92.0	88.1
Minimum	51.7	56.9	62.5	61.4	73.8	74.3
Samples tested	28	72	18	20	16	6
Average thickness	3.8	3.8	3.8	3.8	3.7	3.8
Failure mode	Brittle	Brittle	Brittle	Brittle	Brittle	Brittle

 

 

Table 2: Multi-Axial Impact test performed an A2LA certified laboratory.

 

 

A2LA Certified Laboratory
Test temperature	120°C	23°C	0°C	-15°C	-30°C	-40°C
Impact velocity (m/sec)	6.7	2.2	2.2	2.2	2.2	2.2
Peak energy (Joules)
Average	45.4	40.3	43.7	47.9	54.3	51.0
Standard deviation	4.6	4.4	4.2	4.6	9.2	10.7
COV	10.1	10.8	9.7	9.7	16.9	21.0
Maximum	60.7	51.1	48.8	59.9	74.1	75.6
Minimum	35.6	32.1	37.0	47.9	45.0	40.9
Total energy (Joules)
Average	66.0	70.0	74.0	79.1	97.2	93.2
Standard deviation	10.6	9.8	3.1	3.7	7.0	6.8
COV	16.1	14.0	4.2	4.7	7.2	7.3
Maximum	95.5	79.9	77.6	84.7	109.1	105.1
Minimum	58.1	58.1	67.6	73.3	87.9	84.7
Samples tested	30	30	10	10	10	10
Average thickness	3.6	3.7	3.7	3.7	3.8	3.7
Failure mode	Brittle	Brittle	Brittle	Brittle	Brittle	Brittle

 

 

 

 

Figure 1: Graph of Multi-Axial Impact Test at 23°C and an impact velocity of 2.2 m/sec.

 

 

 

 

Figure 2: Graph of Multi-Axial Impact Test at 120°C and an impact velocity of 2.2 m/sec.

 

 

 

 

Figure 3: Graph of Multi-Axial Impact Test at 0°C and an impact velocity of 2.2 m/sec.

 

 

 

 

Figure 4: Graph of Multi-Axial Impact Test at -15°C and an impact velocity of 2.2 m/sec. 

 

 

 

 

Figure 5: Graph of Multi-Axial Impact Test at -30°C and an impact velocity of 2.2 m/sec. 

 

 

 

 

Figure 6: Graph of Multi-Axial Impact Test at -40°C and an impact velocity of 2.2 m/sec.