SUMIKASUPER LCP shows excellent thermal stability when molding is performed under proper molding conditions, and it is able to retain its physical properties even after repeated recycling.

Changes in Properties When Recycled Materials are Mixed

For representative grades of SUMIKASUPER LCP, changes in properties were evaluated when the use ratio of recycled materials and their recycling number were varied. (see Figure 4-4-1 ,4-4-2 and Table 4-4-1) The use of recycled materials slightly degrades the properties of SUMIKASUPER LCP, but they are not degraded significantly even when the recycling number of recycled materials is increased.
When using recycled materials, it is necessary to carefully manage the quality of the recycled materials. In addition, the ratio of recycled materials to be used and the limit on the recycling number should be determined based on the required characteristics and quality of the molded products.

Figure 4-4-1 Relationship between the Number of Recycling and Tensile Strength Retention

Figure 4-4-2 Relationship between the Number of Recycling and Mold Shrinkage

Table 4-4-1 Property retention rate of SUMIKASUPER LCP relative to virgin materials when the use ratio of recycled materials is 50%.

Unit : Retention (%)

		Test method	E6007LHF		E6807LHF
			50% 3 times recycled	50% 7 times recycled	50% 3 times recycled	50% 7 times recycled
Tensile strength		ASTM D638	99	99	94	96
Tensile elongation			97	97	97	99
Flexural strength		ASTM D790	99	98	98	99
Flexural modulus			99	99	100	99
Izod impact strength (unnotched)		ASTM D256	99	99	100	96
DTUL	1.82MPa	ASTM D648	98	98	99	99

		Test method	E6808UHF		SZ6505HF
			50% 3 times recycled	50% 7 times recycled	50% 3 times recycled	50% 7 times recycled
Tensile strength		ASTM D638	100	98	91	95
Tensile elongation			100	94	88	92
Flexural strength		ASTM D790	97	99	99	99
Flexural modulus			98	99	99	99
Izod impact strength (unnotched)		ASTM D256	96	89	100	100
DTUL	1.82MPa	ASTM D648	98	99	99	100

Property Retention of SUMIKASUPER SV6808THF When Recycled Material Ratio Is Changed

Test Method

- Injection molding conditions : Resin temperature 350°C, Mold temperature 130°C
- Recycling method : The molded product is crushed in a pulverizer to produce recycled material.
- Use ratio of recycled material : 25, 50, 70, 80, and 100% (Uniformly mixed with virgin material)
- Number of times materials are recycled (Recycling number) : 1 to 3 times

Table 4-4-2 Property retention rate of SUMIKASUPER SV6808THF
when the use ratio of recycled materials and the recycling number are varied.

Unit : Retention (%)

		Test method	Virgin	25% 1time	25% 3times	50% 1time	50% 3times	70% 1time	70% 3times
Specific gravity		ASTM D792	100	100	100	100	100	100	100
Mold shrinkage rate(*)	MD TD	Internal	0.22 0.56	0.22 0.56	0.22 0.56	0.22 0.58	0.21 0.57	0.22 0.58	0.21 0.58
Tensile	Strength Elongation	ASTM D638	100 100	98 102	100 103	96 99	96 96	96 97	95 96
Flexural	Strength Modulus	ASTM D790	100 100	100 101	102 101	99 102	99 101	100 100	96 101
Izod impact strength	Unnotched	ASTM D256	100	101	98	96	94	95	81
DTUL	1.82MPa 0.45MPa	ASTM D648	100 100	99 99	99 100	98 99	99 99	97 99	98 98
Blistering temperature		Internal	100	100	104	104	104	104	100
Thin-wall flow length 100MPa	0.1mm 0.2mm 0.3mm	Internal	100 100 100	100 99 100	104 101 105	104 104 108	104 106 110	105 104 108	113 111 117
Thin-wall flow length 150MPa	0.1mm 0.2mm 0.3mm	Internal	100 100 100	103 100 102	102 102 103	106 103 105	102 106 106	108 102 104	111 107 110
Thin-wall flexural strength	0.1mm 0.2mm 0.3mm	Internal	100 100 100	96 101 98	95 99 101	99 98 107	101 96 104	99 97 103	95 93 100

		Test method	80% 1time	80% 3times	100% 1time	100% 3times
Specific gravity		ASTM D792	100	100	100	100
Mold shrinkage rate(*)	MD TD	Internal	0.22 0.58	0.21 0.58	0.21 0.59	0.21 0.59
Tensile	Strength Elongation	ASTM D638	93 94	88 94	92 96	85 82
Flexural	Strength Modulus	ASTM D790	96 101	91 101	96 101	88 100
Izod impact strength	Unnotched	ASTM D256	90	77	95	63
DTUL	1.82MPa 0.45MPa	ASTM D648	98 99	97 97	97 98	96 96
Blistering temperature		Internal	100	100	100	100
Thin-wall flow length 100MPa	0.1mm 0.2mm 0.3mm	Internal	102 105 108	111 114 124	109 109 111	118 122 133
Thin-wall flow length 150MPa	0.1mm 0.2mm 0.3mm	Internal	107 104 106	107 111 112	109 106 108	113 120 118
Thin-wall flexural strength	0.1mm 0.2mm 0.3mm	Internal	98 98 102	99 93 95	94 95 100	97 89 82

* Mold shrinkage is measured on a 64mm x 64mm x 3mm flat test piece.