Thermoplastic composition having improved flame retardant properties

Abstract

The invention relates to a composition comprising a) a thermoplastic matrix polymer based on one or more ethylenically unsaturated polymerizable monomer(s), wherein the thermoplastic polymer is selected from the group consisting of polyolefins, polystyrene, polyacrylates, ethylene-vinylacetate copolymer, and copolymers and blends of the aforementioned, b) an inorganic flame retardant, c) a polymer based on one or more ethylenically unsaturated polymerizable monomers and having a plurality of alkoxysilane and/or acetoxysilane groups covalently linked to the polymer, wherein the ethylenically unsaturated polymerizable monomers of component c) are different or have a different composition than the ethylenically unsaturated monomer(s) of component a) and d) a clay.

Claims

1. A process of preparing a thermoplastic polymer composition, the process comprising: blending a) a thermoplastic polymer, b) an inorganic flame retardant, c) a polymer, and d) a clay, the thermoplastic polymer a) being based on one or more ethylenically unsaturated polymerizable monomers, the thermoplastic polymer a) including one or more of a polyolefin, a polystyrene, a polyacrylate, an ethylene-vinylacetate copolymer, and copolymers of the aforementioned, and wherein the thermoplastic polymer a) does not contain alkoxysilane groups, the polymer c) having been obtained by grafting one or more of an ethylenically unsaturated alkoxysilane functional monomer and an ethylenically unsaturated acetoxysilane functional monomer to a polymer based on one or more ethylenically unsaturated polymerizable monomers, and the polymer c) improving the flame retardant properties of the thermoplastic polymer composition.

2. The process according to claim 1 wherein the one or more ethylenically unsaturated polymerizable monomers of the polymer c) are different from the one or more ethylenically unsaturated monomers of the thermoplastic polymer a), and if thermoplastic polymer a) comprises the ethylene-vinylacetate copolymer, the sum of the differences of the weight-% for each monomer type in the monomer compositions of thermoplastic polymer a) and polymer c) is at least 15 weight %.

3. The process according to claim 1, wherein the inorganic flame retardant b) includes one or more of aluminum trihydroxide and magnesium dihydroxide.

4. The process according to claim 1, wherein at least 15 mol-% of the one or more ethylenically unsaturated polymerizable monomers on which polymer c) is based are different from the one or more ethylenically unsaturated polymerizable monomers on which thermoplastic polymer a) is based.

5. The process according to claim 1, wherein-the polymer c) is included in an amount in the range of 0.1 to 10.0% by weight, calculated on the total weight of thermoplastic polymer a) and the inorganic flame retardant b).

6. The process according to claim 1, wherein the polymer c) comprises the grafted one or more of the ethylenically unsaturated alkoxysilane functional monomer and the ethylenically unsaturated acetoxysilane functional monomer in an amount in the range of 0.1 to 10.0% by weight, calculated on the weight of polymer c).

7. The process according to claim 1, wherein-the thermoplastic polymer a) includes one or more of polyethylene, polypropylene, a copolymer of ethylene with another olefin, and a copolymer of propylene with another olefin.

8. An electrical component comprising an electrically conductive element and an electrical insulator, wherein the electrical insulator comprises a composition, the composition-comprising: a) thermoplastic polymer based on one or more ethylenically unsaturated polymerizable monomers, the thermoplastic polymer a) including one or more of a polyolefin, a polystyrene, a polyacrylate, an ethylene vinylacetate copolymer, and copolymers of the aforementioned, and wherein the thermoplastic polymer a) does not contain alkoxysilane groups, b) an inorganic flame retardant, c) a polymer based on one or more ethylenically unsaturated polymerizable monomers, and the polymer c) having been obtained by grafting at least one ethylenically unsaturated alkoxysilane and/or acetoxysilane functional monomer to a polymer based on one or more ethylenically unsaturated polymerizable monomers, the polymer c) improving the flame retardant properties of the thermoplastic polymer composition, and d) a clay.

9. The electrical component according to claim 8, wherein the electrical component is a cable comprising an electrically conductive core and an electrically insulating cable.

10. A composition comprising a) a thermoplastic polymer based on one or more ethylenically unsaturated polymerizable monomers, the thermoplastic polymer a) including one or more of a polyolefin, a polystyrene, a polyacrylate, an ethylene-vinylacetate copolymer, and copolymers of the aforementioned, and wherein the thermoplastic polymer a) does not contain alkoxysilane groups, b) an inorganic flame retardant, c) a polymer based on one or more ethylenically unsaturated polymerizable monomers, the polymer c) including a plurality of one or more of alkoxysilane groups and acetoxysilane groups, and having been obtained by grafting at least one ethylenically unsaturated alkoxysilane and/or acetoxysilane functional monomer to a polymer based on one or more ethylenically unsaturated polymerizable monomers, wherein the one or more ethylenically unsaturated polymerizable monomers on which polymer c) is based are different from the one or more ethylenically unsaturated-monomers on which thermoplastic polymer a) is based, and if thermoplastic polymer a) comprises the ethylene-vinylacetate copolymer, the sum of the differences of the weight-% for each monomer type in the monomer compositions of thermoplastic polymer a) and polymer c) is at least 15 weight-%, the polymer c) improving the flame retardant properties of the thermoplastic polymer composition, and d) a clay.

11. The process according to claim 1, wherein the polymer c) is included in an amount in the range of 0.5 to 7.0% by weight, calculated on the total weight of thermoplastic polymer a) and the inorganic flame retardant b).

12. The process according to claim 1, wherein the polymer c) comprises the grafted one or more of the ethylenically unsaturated alkoxysilane functional monomer and the ethylenically unsaturated acetoxysilane functional monomer in an amount in the range of 0.2 to 6.0% by weight, calculated on the weight of polymer c).

13. The process according to claim 1, wherein the polymer c) comprises the grafted one or more of the ethylenically unsaturated alkoxysilane functional monomer and the ethylenically unsaturated acetoxysilane functional monomer in an amount in the range of 0.3 to 5.0% by weight, calculated on the weight of polymer c).

14. A composition comprising: a) a thermoplastic polymer comprising one or more of a polyolefin, a polystyrene, a polyacrylate, an ethylene-vinylacetate copolymer, and copolymers thereof, the thermoplastic polymer a) not containing alkoxysilane groups, b) an inorganic flame retardant, c) a polymer including a structure formed from a material comprising ethylenically unsaturated monomers and having been obtained by grafting one or more of ethylenically unsaturated alkoxysilane functional monomers and acetoxysilane functional monomers to a polymer based on one or more ethylenically unsaturated polymerizable monomers, wherein the polymer c) is included in the range of 0.5 to 7.0% by weight, calculated on the total weight of thermoplastic polymer a) and the inorganic flame retardant b), the polymer c) improving flame the retardant properties of the thermoplastic polymer composition, and d) a clay.

15. The composition according to claim 14, wherein at least 15 mol-% of the ethylenically unsaturated polymerizable monomers used to form the structure of polymer c) are different from the ethylenically unsaturated monomers used to form the structure of thermoplastic polymer a).

16. The process according to claim 1, wherein the thermoplastic polymer a) comprises an ethylene-vinylacetate copolymer.

17. The process according to claim 1, wherein the thermoplastic polymer a) comprises an ethylene-vinylacetate copolymer and a polyolefin.

18. The process according to claim 1, the polymer c) having been obtained by grafting an ethylenically unsaturated alkoxysilane functional monomer to a polymer based on one or more ethylenically unsaturated polymerizable monomers.

19. The process according to claim 1, the polymer c) having been obtained by grafting both an ethylenically unsaturated alkoxysilane functional monomer and an ethylenically unsaturated acetoxysilane functional monomer to a polymer based on one or more ethylenically unsaturated polymerizable monomers.

20. The process according to claim 7, wherein the thermoplastic polymer a) includes polyethylene and not a polyacrylate.

21. The composition according to claim 10, wherein the thermoplastic polymer a) includes polypropylene.

22. The composition according to claim 14, wherein the thermoplastic polymer comprises a polyolefin.

Description

EXAMPLES

(1) Preparation of Polymers Having a Plurality of Alkoxysilane Groups Linked to it (Component C))

(2) The following abbreviations for raw materials are used:

(3) TABLE-US-00001 Abbreviation Description SEBS 1 Calprene H6110, MFI: 1.5 g/10 min (230° C./2.16 kg, ASTM 1238), Supplier: Dynasol Elastomers PP 1 Polypropylen, MFI: 4-5/10 min (230° C./2.16 kg, ISO 1133), Supplier: Borealis EVA 1 Copolymer of ethylene and vinylacetate (14% by weight of vinyl acetate), MFI: 3 g/10 min (190° C./2.16 kg, ISO 1133), Supplier: Innospec HDPE 1 High density polyethylene, MFI: 21.5 g/10 min (190° C./2.16 kg, ISO 1133), Supplier: Ineos LLDPE 1 Linear low density polyethylene, MFI: 50 g/10 min (190° C./2.16 kg, ASTM 1238), Supplier: Exxon Mobil DLPO Dilauroylperoxide DPOC Dicetyl Peroxidicarbonate DHBP 2,5-Dimethyl-2,5-Di(tert-butyl peroxi)hexane, MEMO 3-Methacryloxypropyltrimethoxysilan VTMO Vinyltrimethoxysilane VTEO Vinyltriethoxysilane

(4) General Procedure for Grafting

(5) 100 parts by weight (pbw) of polymer powder were placed in a stainless steel reactor with stirrer and temperature control. The indicated amount and type of peroxide was added to the reactor, stirring was started, and the reactor was purged with nitrogen, evacuated and purged with nitrogen to remove oxygen and moisture. The indicated amount and types of monomers were added, and the reactor was heated to 50° C. and purged with nitrogen for 5 minutes, and subsequently the temperature was further increased to the indicated reaction temperature during a period of 35 minutes. The reaction temperature was maintained for 60 minutes, while the stirrer speed was 250 to 500 min.sup.−1. Subsequently, the stirrer speed was reduced to 120 min.sup.−1 and any unreacted monomers were removed by purging with nitrogen for 1 hour. Then the reaction product was allowed to cool to room temperature. Table 1 summarizes the grafting procedures and products. The parts by weight (pbw) in Table 1 are calculated on 100 parts of polymer. The degree of grafting was determined gravimetrically by the weight gain of the polymer. The graft polymer was characterized by the melt volume rate (MVR).

(6) TABLE-US-00002 TABLE 1 Grafting Monomers Peroxide reaction- Degree of grafting MVR experiment Polymer (pbw) (pbw) temperature (% by weight) (ISO 1133) A SEBS 1 MEMO (3.0) DLPO (0.67)  96° C. 2.25 23 cm.sup.3/10 min Styrene (1.0) (230° C./10 kg) B PP 1 MEMO (3.0) DLPO (0.90)  95° C. 2.40 7.6 cm.sup.3/10 min Styrene (1.0) (190° C./2.16 kg) C PP 1 VTMO (5.0) DLPO (0.50) 105° C. 1.25 169 cm.sup.3/10 min Styrene (1.0) (190° C./2.16 kg) D EVA 1 VTEO (5.0) DHBP (0.50)  75° C. 1.50 13 cm.sup.3/10 min Styrene (3.0) (190° C./2.16 kg) E HDPE 1 MEMO (3.0) DLPO (0.50) 100° C. 2.15 65 cm.sup.3/10 min Styrene (1.0) (190° C./2.16 kg) F HDPE 1 VTMO (5.0) DLPO (1.00) 100° C. 1.30 64 cm.sup.3/10 min (19 0° C./2.16 kg) G LLDPE 1 MEMO (3.0) DLPO (0.80)  95° C. 2.64 55 cm.sup.3/10 min Styrene (1.0) (190° C./2.16 kg)

(7) Use of Silane Grafted Polymers

(8) To demonstrate the effectiveness of the silane grafted polymers as fire retardant additive agents, several inventive and comparative compositions were prepared according to the following general procedure. The following raw materials were used.

(9) TABLE-US-00003 Raw material description ATH Aluminiumtrihydroxide, Matrinal OL-104 LEO ex Martinswerke UL 00328 Exxon Escorene UL 00328, copolymer of ethylene und vinyl acetate containing 28% by weight of vinyl acetate ex Exxon Mobil LL 1001 XV Low density polyethylene ex Exxon Mobil Irganox 1010 phenolic antioxidant ex BASF RP 2016 Polypropylene ex Lyondell Basell Mg(OH)2 Magnesiumhydroxide Magnefin H5 ex Martinswerke Solumer 871 Ethylene-Octene-Copolymer ex SKinnovation SCONA TSPE 1112 GALL Carboxylated polyethylene ex BYK-Chemie GmbH Cloisite 5 Layered silicate ex BYK-Chemie GmbH Cloisite 20 Layered silicate ex BYK-Chemie GmbH

(10) General Procedure for Preparing Polymer Compositions According to the Invention and Comparative Compositions

(11) Thermoplastic polymer powder was mixed with an antioxidant and a silane grafted polymer in the indicated amounts. This mixture was fed to a dosing balance of an extruder (model Coperion ZSK 18 K38). Inorganic flame retardant was fed to a side inlet of the extruder via a second dosing balance. Extrusion was carried out using the temperature profile detailed further below and at 300 rpm. The overall capacity of the extruder was 2 kg/h. The composition left the extruder via a slot die (dimensions 28 mm×3 mm) and was cooled.

(12) Temperature profiles in the extruder from polymer entry funnel to slot die:

(13) For polyethylene and ethylene vinyl acetate polymers:

(14) 130° C./150° C./160° C./155° C./160° C./170° C.

(15) For polypropylene:

(16) 130° C./150° C./160° C./155° C./160° C./170° C.

(17) Preparation of Test Specimen for Examples 1 to 66

(18) The extruded strings were placed in a stainless steel frame of inner dimensions 15.0 cm×15.0 cm×3.2 mm. The string pieces were arranged to completely cover the lateral inner surface of the frame. The upper and lower surface of the frame were covered with a polyethylene foil. The frame was then placed in a pre-heated press having a temperature of the pressing tool of 170° C. to 190° C. The press was then closed for 60 seconds and subsequently pressure of 30 to 50 bar was applied for 60 seconds. Next, the steel frame was removed from press, and the upper polyethylene foil was removed and the pressed sample was removed from the steel frame and allowed to cool to room temperature. Test specimen of dimension 125 mm×13 mm×3.2 mm was punched form the pressed sample, and subsequently stored at a relative humidity of 45 to 55% and a temperature of 20 to 25° C. for 24 hours.

(19) Preparation of Test Specimen for Examples 67 to 86

(20) The extruded strings were granulated to particles having a size in the range of approximately 0.1 to 0.5 mm. Test specimen of dimension 125 mm×13 mm×3.2 mm were prepared by injection molding, and subsequently stored at a relative humidity of 45 to 55% and a temperature of 20 to 25° C. for 24 hours.

(21) Test Procedure of Flame Retardant Properties

(22) The flame retardant properties of test specimen were determined in a UL-94 fire chamber based on DIN EN 60695-11-10. The test specimen were secured in the sample holders of the UL-94 fire chamber. The burner upper surface was positioned 1 cm below the lower surface of the test specimen, the flame was positioned in a 45° angle and a heating output of 50 W. The test specimen were exposed to the flame for 10 seconds, before removing the flame. If the test specimen extinguished by itself within 10 seconds, the process was repeated until the sample burned or until 5 cycles were performed. For evaluation to the criteria summarized in the table below were used. Test specimen which exhibited fire retardant properties below rating V 2 according to DIN EN 60695-11-10 were marked as F. This rating was added to better distinguish the properties. It is not part of DIN EN 60695-11-10.

(23) TABLE-US-00004 Rating of fire retardant properties criteria F V 0 V 1 V 2 Time to extinction of flame of single  >30 s ≤10 s  ≤30 s  ≤30 s test specimen Accumulated time to extinction of >250 s ≤50 s ≤250 s ≤250 s flame of 5 test specimen Time to extinction of flame plus  >60 s ≤30 s  ≤60 s  ≤60 s smoldering time of single test specimen after the second flame cycle Falling droplets or particles yes no no yes Ignition of the cotton underlay by yes no no yes burning particles

(24) The results are summarized in the tables below. Comparative Examples are marked with an *.

(25) TABLE-US-00005 Inorganic flame Silane Silane Stabilizer rat- Thermoplastic retardant grafted grafted Irganox ing Ex- Polymer (amount polymer polymer 1010 UL ample (amount in pbw) in pbw) in pbw example in pbw 94  1* UL 00328 (32.5) ATH (61) — — 0.3 F LL 1001 XV (6.2)  2* UL 00328 (30.8) ATH (63) — — 0.3 F LL 1001 XV (5.9)  3* UL 00328 (29.1) ATH (65) — — 0.3 F LL 1001 XV (5.6)  4* UL 00328 (29.1) ATH (61) 6.2 D 0.3 F LL 1001 XV (5.6)  5 UL 00328 (29.9) ATH (61) 3.1 B 0.3 V2 LL 1001 XV (5.7)  6 UL 00328 (27.3) ATH (61) 6.2 B 0.3 V2 1001 XV (5.2)  7 UL 00328 (28.2) ATH (63) 3.1 C 0.3 V2 LL 1001 XV (5.4)  8 UL 00328 (25.6) ATH (63) 6.2 C 0.3 V1 LL 1001 XV (4.9)  9 UL 00328 (26.5) ATH (65) 3.1 B 0.3 V1 LL 1001 XV (5.1) 10 UL 00328 (23.9) ATH (65) 6.2 B 0.3 V0 LL 1001 XV (4.7) 11 UL 00328 (29.9) ATH (61) 3.1 A 0.3 V1 LL 1001 XV (5.7) 12 UL 00328 (27.3) ATH (61) 6.2 A 0.3 V1 LL1001 XV (5.2) 13 UL 00328 (28.2) ATH (63) 3.1 A 0.3 V2 1001 XV (5.4) 14 UL 00328 (25.6) ATH (63) 6.2 A 0.3 V1 1001 XV (4.9) 15 UL 00328 (26.5) ATH (65) 3.1 A 0.3 V1 LL 1001 XV (5.1) 16 UL 00328 (23.9) ATH (65) 6.2 A 0.3 V0 LL 1001 XV (4.7) 17 UL 00328 (27.3) ATH (61) 6.2 G 0.3 V2 LL 1001 XV (5.2) 18 UL 00328 (25.6) ATH (63) 6.2 G 0.3 V2 LL 1001 XV (4.9) 19 UL 00328 (26.6) ATH (65) 3.1 G 0.3 V2 LL 1001 XV (5.1) 20 UL 00328 (23.9) ATH (65) 6.2 G 0.3 V2 LL 1001 XV (4.7) 21 UL 00328 (29.9) ATH (61) 3.1 F 0.3 V2 LL 1001 XV (5.7) 22 UL 00328 (27.3) ATH (61) 6.2 F 0.3 V2 1001 XV (5.2) 23 UL 00328 (28.2) ATH (63) 3.1 E 0.3 V2 1001 XV (5.4) 24 UL 00328 (25.6) ATH (63) 6.2 E 0.3 V2 LL 1001 XV (4.9) 25 UL 00328 (26.5) ATH (65) 3.1 E 0.3 V2 LL 1001 XV (5.1) 26 UL 00328 (29.9) ATH (65) 6.2 E 0.3 V2 1001 XV (4.7)

(26) It can be concluded that the addition of silane-functional polymers significantly improves the flame retardant properties of the compositions according to the invention. Comparative Example 4 demonstrates that the improvement is not present when the thermoplastic matrix polymer and the silane functional polymer are based on the same monomers.

(27) TABLE-US-00006 Inorganic Silane Silane Thermoplastic flame grafted grafted Clay Stabilizer polymer (amount in retardant polymer polymer Cloisite 20 Irganox Rating Example pbw) (pbw) in pbw example in pbw 1010 in pbw UL 94 27* UL 00328 (32.0) ATH (61) — — 0.5 0.3 V2 LL 1001 XV (6.2) 28* UL 00328 (30.5) ATH (63) — — 0.5 0.3 V2 LL 1001 XV (5.7) 29 UL 00328 (29.6) ATH (61) 3.1 B 0.5 0.3 V0 LL 1001 XV (5.5) 30 UL 00328 (27.0) ATH (61) 6.2 B 0.5 0.3 V0 LL 1001 XV (5.0) 31 UL 00328 (27.9) ATH (63) 3.1 B 0.5 0.3 V0 LL 1001 XV (5.2) 32 UL 00328 (25.3) ATH (63) 6.2 B 0.5 0.3 V0 LL 1001 XV (4.7) 33 UL 00328 (29.6) ATH (61) 3.1 A 0.5 0.3 V0 LL 1001 XV (5.5) 34 UL 00328 (27.0) ATH (61) 6.2 A 0.5 0.3 V0 LL 1001 XV (5.0) 35 UL 00328 (27.9) ATH (63) 3.1 A 0.5 0.3 V0 LL 1001 XV (5.2) 36 UL 00328 (25.3) ATH (63) 6.2 A 0.5 0.3 V0 1001 XV (4.7) 37 UL 00328 (29.6) ATH (61) 3.1 G 0.5 0.3 V1 LL 1001 XV (5.5) 38 UL 00328 (27.0) ATH (61) 6.2 G 0.5 0.3 V1 LL 1001 XV (5.0) 39 UL 00328 (27.9) ATH (63) 3.1 G 0.5 0.3 V1 LL 1001 XV (5.2) 40 UL 00328 (25.3) ATH (63) 6.2 G 0.5 0.3 V1 1001 XV (4.7) 41 UL 00328 (29.6) ATH (61) 3.1 E 0.5 0.3 V1 LL 1001 XV (5.5) 42 UL 00328 (27.0) ATH (61) 6.2 E 0.5 0.3 V1 LL 1001 XV (5.0) 43 UL 00328 (27.9) ATH (63) 3.1 E 0.5 0.3 V1 1001 XV (5.2) 43 UL 00328 (25.3) ATH (63) 6.2 E 0.5 0.3 V1 1001 XV (4.7) Inorganic Silane Silane flame grafted grafted Stabilizer Thermoplastic polymer retardant polymer polymer Irganox 1010 Rating UL Example (pbw) (pbw) in pbw example (pbw) 94 45* Solumer 871 (29.8) ATH (65) — — 0.3 F TSPE 1112 GALL (4.9) 46 Solumer 871 (26.8) ATH (65) 3.1 C 0.3 V1 TSPE 1112 GALL (4.8) 47 Solumer 871 (24.5) ATH (65) 6.2 C 0.3 V0 TSPE 1112 GALL (4.0) 48 Solumer 871 (26.8) ATH (65) 3.1 A 0.3 V2 TSPE 1112 GALL (4.8) 49 Solumer 871 (24.5) ATH (65) 6.2 A 0.3 V1 TSPE 1112 GALL (4.0) 50 Solumer 871 (26.8) ATH (65) 3.1 G 0.3 V2 TSPE 1112 GALL (4.8) 51 Solumer 871 (24.5) ATH (65) 6.2 G 0.3 V1 TSPE 1112 GALL (4.0) 52 Solumer 871 (26.8) ATH (65) 3.1 F 0.3 V2 TSPE 1112 GALL (4.8) 53 Solumer 871 (24.5) ATH (65) 6.2 F 0.3 V1 TSPE 1112 GALL (4.0) 54 Solumer 871 (26.8) ATH (65) 3.1 D 0.3 V2 TSPE 1112 GALL (4.8) 55 Solumer 871 (24.5) ATH (65) 6.2 D 0.3 V1 TSPE 1112 GALL (4.0)

(28) TABLE-US-00007 Inorganic Silane Silane flame grafted grafted Clay Stabilizer Thermoplastic polymer retardant polymer polymer Cloisite Irganox 1010 Rating UL Composition (amount in pbw) (pbw) in pbw example 5 in pbw (pbw) 94 56* Solumer 871 (29.8) ATH (65) — — 0.5 0.3 F TSPE 1112 GALL (4.9) 57 Solumer 871 (26.5) ATH (65) 3.1 C 0.5 0.3 V0 TSPE 1112 GALL (4.6) 58 Solumer 871 (24.2) ATH (65) 6.2 C 0.5 0.3 V0 TSPE 1112G ALL (3.8) 59 Solumer 871 (26.5) ATH (65) 3.1 A 0.5 0.3 V1 TSPE 1112 GALL (4.6) 60 Solumer 871 (24.5) ATH (65) 6.2 A 0.5 0.3 V0 TSPE 1112 GALL (3.8) 61 Solumer 871 (26.5) ATH (65) 3.1 G 0.5 0.3 V2 TSPE 1112 GALL (4.6) 62 Solumer 871 (24.2) ATH (65) 6.2 G 0.5 0.3 V1 TSPE 1112 GALL (3.8) 63 Solumer 871 (26.5) ATH (65) 3.1 F 0.5 0.3 V2 TSPE 1112 GALL (4.6) 64 Solumer 871 (24.2) ATH (65) 6.2 F 0.5 0.3 V1 TSPE 1112 GALL (3.8) 65 Solumer 871 (26.5) ATH (65) 3.1 D 0.5 0.3 V1 TSPE 1112 GALL (4.6) 66 Solumer 871 (24.5) ATH (65) 6.2 D 0.5 0.3 V1 TSPE 1112 GALL (3.8) Silane Silane grafted grafted Stabilizer Thermoplastic Inorganic flame polymer polymer Irganox 1010 Rating UL Composition polymer (pbw) retardant (pbw) in pbw example pbw 94 67* RP 2016 (41.0) Mg(OH)2 (59) — — 0.3 F 68* RP 2016 (37.7) Mg(OH)2 (62) — — 0.3 V2 69 RP 2016 (37.6) Mg(OH)2 (59) 3.1 A 0.3 V2 70 RP 2016 (34.6) Mg(OH)2 (62) 3.1 A 0.3 V1 71 RP 2016 (37.6) Mg(OH)2 (59) 3.1 G 0.3 V0 72 RP 2016 (34.6) Mg(OH)2 (62) 3.1 G 0.3 V0 73 RP 2016 (37.6) Mg(OH)2 (59) 3.1 E 0.3 V2 74 RP 2016 (34.6) Mg(OH)2 (62) 3.1 E 0.3 V1 75 RP 2016 (34.6) Mg(OH)2 (62) 3.1 D 0.3 V1 76 RP 2016 (34.6) Mg(OH)2 (62) 3.1 D 0.3 V0