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  <controlfield tag="003">Thư viện trường Cao đẳng Kỹ thuật Cao Thắng</controlfield>
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   <subfield code="a">Nhà máy Cao su Sao vàng Hà Nội</subfield>
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   <subfield code="a">Tiêu chuẩn nhà nước: Cao su. Phương pháp xác định hệ số già hóa: TCVN 2229-77 /</subfield>
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   <subfield code="a">H. :</subfield>
   <subfield code="b">Ủy ban khoa học và kỹ thuật nhà nước ,</subfield>
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   <subfield code="a">Tiêu chuẩn này quy định phương pháp xác định hệ số già hóa bằng không khí nóng, áp dụng cho các loại cao su.</subfield>
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   <subfield code="a">Phương pháp này được tiến hành trên cơ sở mẫu thử tiếp xúc với khí nóng có nhiệt độ quy định ở điều khiện áp lực bình thường trong một thời gian xác định, sau đó do sự thay đổi tính năng cơ lý của mẫu.</subfield>
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